scholarly journals Influence of Vanadium Microalloying on Microstructure and Property of Laser-Cladded Martensitic Stainless Steel Coating

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 826
Author(s):  
Wenfeng Hu ◽  
Hongmei Zhu ◽  
Jipeng Hu ◽  
Baichun Li ◽  
Changjun Qiu
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Testing Machine ◽  
Material Testing ◽  
Number Density ◽  
Steel Coating ◽  
Universal Material Testing Machine ◽  
Property Changes ◽  
Material Testing Machine

Martensitic stainless steel (MSS) coatings with different vanadium (V) contents (0–1.0 wt%) by microalloying have been successfully fabricated utilizing a unique laser cladding technique. The microstructure and properties of the resulting MSS coatings, with and without element V addition, have been carefully investigated by various advanced techniques, including XRD, SEM, TEM, microhardness tester, universal material testing machine, and electrochemical workstation. It was found that the V-free coating was mainly composed of martensite (M) and ferrite (F), trace M23C6 and M2N, while the V-bearing coatings consisted of M, F, M23C6, and VN nano-precipitates, and their number density increased with the increase of V content. The V microalloying can produce a significant impact on the mechanical properties of the resulting MSS laser-cladded specimens. As the V content increased, the elongation of the specimen increased, while the tensile strength and microhardness increased firstly and then decreased. Specifically, the striking comprehensive performance can be optimized by microalloying 0.5 wt% V in the MSS coating, with microhardness, tensile strength, yield strength, and elongation of 500.1 HV, 1756 MPa, 1375 MPa, and 11.9%, respectively. However, the corrosion resistance of the specimens decreased successively with increasing V content. The microstructure mechanisms accounting for the property changes have been discussed in detail.

scholarly journals Effects of Zr, Y on the Microstructure and Properties of As-Cast Cu-0.5Y-xZr (wt.%) Alloys

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1084
Author(s):  
Dong Liang ◽  
Ning Wang ◽  
Yuxiang Wang ◽  
Zhenjie Liu ◽  
Ying Fu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Copper Alloys ◽  
Testing Machine ◽  
Elongation Rate ◽  
Nominal Composition ◽  
Microstructure And Properties ◽  
Universal Material Testing Machine ◽  
Material Testing Machine

In this paper, the microstructure and properties of as-cast Cu-Y-Zr alloys with different Zr content were studied in order to investigate whether the precipitates in copper alloys would interact with each other by adding Y and Zr simultaneously. As-cast Cu-0.5Y-xZr (wt.%, x = 0.05 and 0.1, nominal composition) alloys were prepared by vacuum melting in this study. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) were used to observe the microstructure of the alloys. The mechanical properties of the alloys were tested by universal material testing machine at room temperature. The effects of Zr content on the microstructure and mechanical properties of the alloys were explored. As shown by the research results, in the as-cast Cu-0.5Y-xZr (wt.%) alloys, the precipitated phase was the Cu5Y/Cu5Zr phase and ranged from 10 nm to 70 nm in size; when the Zr content increased from 0.05 wt.% to 0.1 wt.%, both the tensile strength and elongation rate of the alloys increased; when the Zr content was 0.1 wt.%, the tensile strength was 225 MPa and the elongation rate was 22.5%.

scholarly journals Effects of Low-Temperature Tempering on Microstructure and Properties of the Laser-Cladded AISI 420 Martensitic Stainless Steel Coating

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 451 ◽  
Author(s):  
Hongmei Zhu ◽  
Yongzuo Li ◽  
Baichun Li ◽  
Zhenyuan Zhang ◽  
Changjun Qiu
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Martensitic Stainless Steel ◽  
Testing Machine ◽  
Industrial Applications ◽  
Slight Reduction ◽  
Micro Hardness ◽  
Microstructure And Properties ◽  
Steel Coating ◽  
Aisi 420

Post-treatment is crucial to improve the comprehensive performance of laser-cladded martensitic stainless steel coatings. In this work, a low-temperature tempering treatment (210 °C), for the first time, was performed on the laser-cladded AISI 420 martensitic stainless steel coating. The microstructure and properties of the pre- and post-tempering specimens were carefully investigated by XRD, SEM, TEM, a micro-hardness tester, a universal material testing machine and an electrochemical workstation. The results show that the as-cladded AISI 420 stainless steel coating mainly consisted of martensite, austenite, Fe3C and M23C6 carbides. The phase constituent of the coating remained the same, however, the martensite decomposed into finer tempered martensite with the precipitation of numerous nano-sized Fe3C carbides and reverted austenite in the as-tempered specimen. Moreover, a slight reduction was found in the micro-hardness and tensile strength, while a significant increase in elongation was achieved after tempering. The fractography showed a transition from brittle fracture to ductile fracture accordingly. The as-tempered coating exhibited a striking combination of mechanical properties and corrosion resistance. This work can provide a potential strategy to enhance the overall properties of the laser-deposited Fe-based coating for industrial applications.

Development and Properties of a New Correction Instrument of Pectus Excavatum

2009 ◽  
Vol 610-613 ◽  
pp. 1327-1330
Author(s):  
Yu Ling Hu ◽  
Xue Bao Yu ◽  
Wei Dong Miao ◽  
Gang Liu
Keyword(s):  
Mechanical Properties ◽  
Minimally Invasive ◽  
Pectus Excavatum ◽  
Testing Machine ◽  
Pure Titanium ◽  
Material Testing ◽  
Invasive Technique ◽  
Nuss Procedure ◽  
Universal Material Testing Machine ◽  
Material Testing Machine

A new correction instrument of pectus excavatum is introduced which is designed for a minimally invasive technique (Nuss procedure). The instrument was made of pure titanium plates, and finished by machining, surface treatment and so on. The instrument was made up of correcting bar and fixing bar. The mechanical properties of the instrument was measured with electron universal material testing machine, the safety and validity was verified by clinical doctors after being implanted into the patient. Results showed that the mechanical properties of the instrument keep constantly after implantation for two years. It is lighter than the like product, and can lighten the patent’s and the doctor’s operation bearing. It had been applied in national hospitals, and results showed that it was of better biocompatibility, and few complications were found. Clinical treatment effects were satisfactory.

Crystal Morphology and Thermal Properties of PTT/POE/OMMT Nanocomposites

2011 ◽  
Vol 181-182 ◽  
pp. 39-42
Author(s):  
Ming Tao Run ◽  
Qing Chang Zhang ◽  
Wen Zhou ◽  
Yu Zhong
Keyword(s):  
Crystal Morphology ◽  
Testing Machine ◽  
Crystallization Rate ◽  
Material Testing ◽  
Melt Crystallization ◽  
Nucleation Agent ◽  
Scanning Calorimetry ◽  
Lower Melting Point ◽  
Universal Material Testing Machine ◽  
Material Testing Machine

The crystal morphology, melt-crystallization and mechanical properties of poly (trimethylene terephthalate)/maleinized poly (octene-ethylene)/organo-montmorillonite nanocomposites were investigated by using polarized optical microscopy (POM), differential scanning calorimetry (DSC) and universal material testing machine, respectively. The results suggest that the nanocomposites form smaller or imperfect microcrystallites with lower melting point due to the influence of OMMT components and the nanocomposites have increased crystallization rate because OMMT is an effective nucleation agent. However, the crystallinity decreases because of the thickening effect of OMMT in the composites. The nanocomposite with 2%OMMT has the largest tensile and impact strength.

scholarly journals ANALISIS KEKUATAN TARIK KAMPUH V DAN KAMPUH I SAMBUNGAN LAS BAJA KARBON RENDAH YANG TERDAPAT PADA BESI IWF 400

2019 ◽  
Author(s):  
Irzal ◽  
syahrul
Keyword(s):  
Testing Machine ◽  
Material Testing ◽  
Test Machine ◽  
Type I ◽  
Average Value ◽  
Joint Connection ◽  
Connection Type ◽  
Universal Material Testing Machine ◽  
Material Testing Machine ◽  
Welding Position

by using connection type I. To get a good welding result is determined several factors, including the properties of material welding, connection type, welding position, and electrode used. In a welding project, there is still a welder that only uses I in the weld IWF 400 connecting iron while the thickness of the material 13 mm. This study aims to determine the effect of the use of campuh against the strength of weld joint connection using LB 52U 2.6 mm Electrode and RD 7018 3.2 mm electrode with AC Flow. In this study using experimental method begins with making specimens. With the collection of 7 specimens consisting of 3 specimens with welding treatment using Camp V, 3 specimens with welding treatment using Camp I and 1 IWF 400 specimens without welding treatment. From the results of research conducted on specimens by making and testing specimens with a tensile test machine Hydraullic Universal Material Testing Machine then obtained on the specimen without welding average value of Maximum (max) 41,28 kgf/mm². In welded specimens with a connection of the V values the average value of the Maximum (max) 39,82 kgf/mm². On a welded specimen with a maximum I knot connection (max) 38,32 kgf/mm².The results of this study indicate the results of iron welding IWF 400 using camp V greater value voltage 39.82 kgf / mm². From the maximum voltage value obtained from this study it is recommended that iron welding IWF 400 uses V.

An Experimental Study on Flexural-Tensile Property of Cement Stabilized Coal Gangue Roadbase Materials

2014 ◽  
Vol 638-640 ◽  
pp. 1536-1540 ◽  
Author(s):  
Hu Zhu Zhang ◽  
Yuan Fang
Keyword(s):  
Tensile Strength ◽  
Tensile Property ◽  
Influence Factor ◽  
Testing Machine ◽  
Tensile Modulus ◽  
Coal Gangue ◽  
Flexural Tensile Strength ◽  
Loading Method ◽  
Universal Material Testing Machine ◽  
Material Testing Machine

In order to evaluate the flexural-tensile property of cement stabilized coal gangue roadbase materials, flexural-tensile strength and flexural-tensile modulus of materials, whose cement dosage range from 4% to 7%, were tested on the automatic servo universal material testing machine with one-third loading method. Based on the test data, correlation equations between cement dosage and flexural-tensile strength and flexural-tensile modulus were established. Results show that: cement dosage is an important influence factor of flexural-tensile property, both flexural-tensile strength and flexural-tensile modulus increase linearly with the increase of the cement dosage. Cement stabilized coal gangue roadbase materials have a good flexural-tensile property and suitable for base in the pavement structure.

Study on Elongation Properties of Car Roof Interior Fabric

2014 ◽  
Vol 556-562 ◽  
pp. 36-39
Author(s):  
Wei Lai Chen ◽  
Lin Yan Wan ◽  
Wei Hong Zhan
Keyword(s):  
Testing Machine ◽  
Material Testing ◽  
Knitted Fabric ◽  
Deformation Ratio ◽  
Universal Material Testing Machine ◽  
Warp Knitted Fabric ◽  
Material Testing Machine ◽  
Dynamic Elongation ◽  
General Standard

Elongation properties of car roof interior fabric were studied in this article.The FM02-11 type universal material testing machine was employed to test the static and dynamic elongation properties of warp knitted napped fabric 1,2,3,warp knitted fabric 1,2,pile composite fabric A1,A2,A3 and sponge composite fabric C1,C2,C3,C4. The results indicated all can meet the general standard for car interior ceiling fabric.According to the dynamic elongation, the bigger the deformation ratio, the better the formability.

scholarly journals Uji Tarik pada Timing Belt Mobil L300

2017 ◽  
Vol 5 (02) ◽  
pp. 69-73
Author(s):  
Jusnita Jusnita ◽  
Indra Saputra
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Testing Machine ◽  
Material Testing ◽  
Servo Control ◽  
Control Material ◽  
Timing Belt ◽  
Material Testing Machine

Fungsi timing belt pada mesin L300 adalah memindahkan daya dari motor ke crankshaft. Timing belt rentan mengalami kerusakan karena timing belt mengalami gesekan dengan pully. Ada beberapa penyebab kegagalan pada timing belt, seperti : tekanan kerja melebihi dari tekanan kerja timing belt yang diijinkan. Kelemahan rantai timing adalah bunyinya yang kasar sehinga membutuhkan perawatan yang maksimal. Tujuan dari penelitian ini adalah untuk mengetahui kekuatan tarik dari timing belt mobil diesel L 300 menggunakan alat uji tarik. Metode yang digunakan dalam penelitian ini adalah metode pengujian tarik menggunakan alat uji computer servo control material testing machine dengan panjang cekannya (Grif Length) 90 mm dengan membandingkan timing belt original dengan timing belt KW 1. Hasil penelitian untuk spesimen timing belt original merek Genuine Part nilai Mod 156180.34 cm2, max force 16147.2 kgf, 0,2%  79.27439Y.S kgf/cm2,  yield strength 79,27 kgf/cm2, tensile strength 104.75 kgf/cm2, elongation 6,71. Sedangkan untuk spesimen  timing belt KW 1 merek jibox didapat hasil pengujian nilai Mod 46722.70 cm2, max force 5843.2 kgf, 0,2%  27.48854 y.s kgf/cm2,  yield strength 11,21 kgf/cm2, tensile strength 37,90 kgf/cm2, elongation 8,11. material timing belt L 300 merek Genuin Part mengalami putus/gagal terjadi pada tegangan (stres)  82 Mpa dengan regangan 0,01 (10%). Sedangkan untuk material timing belt L 300 merek Jibox menglami putus/gagal pada tegangan 35 Mpa dengan regangan (7%), maka dapat kesimpulan bahwa timing belt merk Genuine part  mempunyai tegangan (stress) 83 Mpa lebih besar dibandingkan dengan material timing belt KW 1 merek Jibox 35 Mpa, sehingga selisih tegangan kedua material tersebut adalah 48 Mpa. Sedangkan untuk  nilai regangannya (strength) pada timing belt merk Geniune Part  adalah 0.01 (10%). Dan untuk  material timing belt KW 1 merk Jibox mempunyai regangan (strength) 0.07 (7%). Maka selisih kedua regangan material timing belt tersebut adalah 0,03 (3%).

Anisotropic Elastoplastic Behavior of SiCp/Al Composite Sheets

2004 ◽  
Author(s):  
D. A. Skolnik ◽  
H. T. Liu ◽  
L. Z. Sun ◽  
H. C. Wu
Keyword(s):  
Theoretical Model ◽  
Plastic Flow ◽  
Experimental Research ◽  
Testing Machine ◽  
Material Testing ◽  
Elastoplastic Behavior ◽  
Al Composite ◽  
Heat Treated ◽  
Universal Material Testing Machine ◽  
Material Testing Machine

Experimental research was performed to study the anisotropic elastoplastic responses of SiCp/Al composite sheets. To investigate the effects of the composite processing, two sets of specimens cut from the heat-treated and as-rolled composite sheets are tested using a universal material-testing machine. The dependence of the strength, plastic flow, and strain ratios on the rolling angles are discussed in detail. To model the phenomena observed in the experiments, a micromechanics based damage framework is developed. The interfacial debonding and the rolling angle’s effects are integrated into this model. Good consistence between the experimental results and the analytical predications shows the validity of the theoretical model.

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