scholarly journals Novel Tensile Test Jig and Mechanical Properties of WC-Co Synthesized by SHIP and HIP Process

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 884
Author(s):  
A-Ra Jo ◽  
Ji-Seob An ◽  
Sun-Hyung Kim ◽  
Myeong-Sik Jeong ◽  
Young-Hoon Moon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Tensile Testing ◽  
Hot Isostatic Pressing ◽  
High Strength ◽  
Tensile Tests ◽  
Isostatic Pressing ◽  
Manufacturing Method ◽  
Axial Tensile ◽  
Co Alloys

Tungsten carbide-cobalt (WC-Co) alloys have various mechanical properties according to their Co content and manufacturing method. High-strength materials such as WC-Co alloys are usually manufactured using various sintering methods. In this study, WC-Co was compared according to the Co content and manufacturing method using the sinter-hot isostatic pressing process. Furthermore, an additional test was performed to investigate the effect of post-hot isostatic pressing (HIP) treatment on the mechanical properties. To compare tensile strength, threaded end and shoulder end specimens are generally applied in axial tensile testing with hard metals. However, it is extremely difficult to shape WC-Co by machining. A tensile testing jig for a shoulder end specimen is, therefore, proposed. Tensile tests were conducted using the proposed jig, and microstructure, hardness, and impact tests were carried out to compare the mechanical properties. The microstructure evolution was obtained by decreasing the Co content and applying the HIP treatment, resulting in changes in Young’s modulus and strength. The results indicated that the proposed jig of the axial tensile test could be applied to the extremely hard WC-Co, and the mechanical properties of WC-Co could be modified by the Co content and HIP treatment control.

scholarly journals Effect of Process Parameter Modification and Hot Isostatic Pressing on the Mechanical Properties of Selectively Laser-Melted 316L Steel

2020 ◽  
Author(s):  
Janusz Kluczynski ◽  
Lucjan Śnieżek ◽  
Krzysztof Grzelak ◽  
Artur Oziębło ◽  
Krzysztof Perkowski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Density ◽  
Process Parameters ◽  
Hot Isostatic Pressing ◽  
Tensile Tests ◽  
Image Correlation ◽  
Deformation Analysis ◽  
Material Strength ◽  
Isostatic Pressing ◽  
Parameter Modification

Industries that rely on additive manufacturing of metallic elements, especially biomedical companies, require material science-based knowledge of how process parameters and methods affect element properties, but such phenomena are incompletely understood. In this study, we investigated the influence of selective laser melting (SLM) process parameters and additional heat treatment on mechanical properties. The research included structural analysis of residual stress, microstructure, and scleronomic hardness in low-depth measurements. Tensile tests with element deformation analysis using digital image correlation (DIC) were performed as well. Experiment results showed it was possible to observe the porosity growth mechanism and its influence on material strength. Elements manufactured with 20% lower energy density had almost half the elongation, which was directly connected with porosity growth during energy density reduction. Hot isostatic pressing (HIP) treatment allowed for a significant reduction of porosity and helped achieve properties similar to elements manufactured using different levels of energy density.

INVESTIGATION OF HOT ISOSTATIC PRESSING AND HEAT TREATMENT EFFECT ON STRUCTURE AND MECHANICAL PROPERTIES OF 3D-PRINTED SAMPLES MADE FROM VT6-PS GRADE MATERIAL

2021 ◽  
pp. 22-30
Author(s):  
A.I. Vasilev ◽  
◽  
P.V. Panin ◽  
S.V. Putyrskiy ◽  
A.M. Rogalev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Hot Isostatic Pressing ◽  
Tensile Tests ◽  
Laser Alloying ◽  
Isostatic Pressing ◽  
Powder Composition ◽  
Selective Laser Alloying ◽  
3D Printed ◽  
Grade Material

Presents the results of the investigation of the influence of hot isostatic pressing and heat treatment on the structure and mechanical properties during tension of synthesized workpieces obtained by selective laser alloying from a metal-powder composition of VT6 alloy. The blanks were subjected to heat treatment at various temperatures in the state after synthesis, as well after HIP. The influence of different heat treatment modes was assessed by the results of tensile tests and structural researches.

Effect of Liquid Hot Isostatic Pressing on Structure and Mechanical Properties of an Aluminum Alloy

2014 ◽  
Vol 794-796 ◽  
pp. 845-850 ◽  
Author(s):  
Damir Tagirov ◽  
Vladislav Kulitskiy ◽  
Nikolay Belov ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Endurance Limit ◽  
Hot Isostatic Pressing ◽  
High Strength ◽  
Shrinkage Porosity ◽  
Eutectic Phase ◽  
Isostatic Pressing ◽  
Elongation To Failure ◽  
Average Size ◽  
Brittle Intergranular Fracture

The effect of liquid hot isostatic pressing (LHIP) on microstructure and mechanical properties of a high-strength cast Al-6Zn-2Mg-0.5Fe-0.7Ni alloy was examined. LHIP eliminates shrinkage porosity that highly improves strength and fatigue limit. Yield stress (YS) and ultimate tensile strength (UTS) in T6 condition increased from 135 to 470 MPa and from 410 to 510 MPa, respectively. Endurance limit on the base of 107 cycles increased from 95 to 140 MPa. However, a small number of gas pores with an average size less than 2 μm retains. LHIP suppresses the crack initiation on coarse cavities. However, brittle intergranular fracture occurs in the hipped alloy through the breaking of eutectic phase Al9FeNi. As a result, elongation-to-failure was of 1.2% and the fatigue strength is equal to one of AA356.02 alloy subjected to LHIP.

scholarly journals Effects of Hot Isostatic Pressing and Heat Treatment on the Microstructure and Mechanical Properties of Cast TiAl Alloy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1156
Author(s):  
Wen Yu ◽  
Jianxin Zhou ◽  
Yajun Yin ◽  
Xin Feng ◽  
Hai Nan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Aluminide ◽  
Hot Isostatic Pressing ◽  
Central Area ◽  
Tensile Tests ◽  
Edge Region ◽  
Isostatic Pressing ◽  
Heat Treated ◽  
Heat Treated Condition ◽  
Cast Condition

Hot isostatic pressing (HIP) and subsequent heat-treatments (HT) are necessary for titanium aluminide (TiAl) casting components. But there are few studies carefully comparing the microstructure changes from the initial as-cast condition to the final heat-treated condition. In this study, the microstructures of Ti-47Al-2Cr-2Nb (at%) alloy in the as-cast, as-HIPed and as-heat-treated conditions were characterized by optical microscopy and scanning electron microscopy. The mechanical properties after HTs were determined by the tensile tests at 700 °C. The results show that after HIP and HTs, all the microstructures exhibit a nearly lamellar (NL) structure and can be divided into an edge region and a central area. The microstructure after HIP in the edge region is normal, while distorted lamellae and many fine recrystallized grains exist in the central area. The yield strengths after three HTs are nearly the same, but the elongation after the HT at 1310 °C is much more than that after HTs at 1185 °C and 1280 °C. A refinement of colony size induced by distorted lamellae in as-HIPed condition is considered responsible for the great improvement in elongation.

scholarly journals Comprehensive Analysis of the Microstructure and Mechanical Properties of Friction-Stir-Welded Low-Carbon High-Strength Steels with Tensile Strengths Ranging from 590 MPa to 1.5 GPa

2021 ◽  
Vol 11 (12) ◽  
pp. 5728
Author(s):  
HyeonJeong You ◽  
Minjung Kang ◽  
Sung Yi ◽  
Soongkeun Hyun ◽  
Cheolhee Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Joint Strength ◽  
Solid Phase ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
Friction Stir ◽  
Welding Processes

High-strength steels are being increasingly employed in the automotive industry, requiring efficient welding processes. This study analyzed the materials and mechanical properties of high-strength automotive steels with strengths ranging from 590 MPa to 1500 MPa, subjected to friction stir welding (FSW), which is a solid-phase welding process. The high-strength steels were hardened by a high fraction of martensite, and the welds were composed of a recrystallized zone (RZ), a partially recrystallized zone (PRZ), a tempered zone (TZ), and an unaffected base metal (BM). The RZ exhibited a higher hardness than the BM and was fully martensitic when the BM strength was 980 MPa or higher. When the BM strength was 780 MPa or higher, the PRZ and TZ softened owing to tempered martensitic formation and were the fracture locations in the tensile test, whereas BM fracture occurred in the tensile test of the 590 MPa steel weld. The joint strength, determined by the hardness and width of the softened zone, increased and then saturated with an increase in the BM strength. From the results, we can conclude that the thermal history and size of the PRZ and TZ should be controlled to enhance the joint strength of automotive steels.

Investigations on the Mechanical Properties and Formability of Friction Stir Welded Tailored Blanks

2007 ◽  
Vol 344 ◽  
pp. 143-150 ◽  
Author(s):  
Gianluca Buffa ◽  
Livan Fratini ◽  
Marion Merklein ◽  
Detlev Staud
Keyword(s):  
Mechanical Properties ◽  
Stress Condition ◽  
Research Effort ◽  
High Strength Steels ◽  
High Strength ◽  
Tensile Tests ◽  
Friction Stir ◽  
Tailored Blanks ◽  
Sheet Stamping ◽  
Wide Range

Tight competition characterizing automotive industries in the last decades has determined a strong research effort aimed to improve utilized processes and materials in sheet stamping. As far as the latter are regarded light weight alloys, high strength steels and tailored blanks have been increasingly utilized with the aim to reduce parts weight and fuel consumptions. In the paper the mechanical properties and formability of tailored welded blanks made of a precipitation hardenable aluminum alloy but with different sheet thicknesses, have been investigated: both laser welding and friction stir welding have been developed to obtain the tailored blanks. For both welding operations a wide range of the thickness ratios has been considered. The formability of the obtained blanks has been characterized through tensile tests and cup deep drawing tests, in order to show the formability in dependency of the stress condition; what is more mechanical and metallurgical investigations have been made on the welded joints.

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