scholarly journals Comparative analysis of characteristics of stainless steel cellular material prepared through powder metallurgy using accicular and crushed urea as spaceholder

2019 ◽  
Vol 16 (2) ◽  
pp. 183-188
Author(s):  
Shailendra Joshi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Powder Metallurgy ◽  
High Strength ◽  
Metallic Foam ◽  
Space Holder ◽  
Excellent Mechanical Property ◽  
Circular Holes ◽  
Steel Foam ◽  
Damping Capability

Stainless steel has an excellent mechanical property as well as high corrosion resistance. Stainless steel foams, therefore, seemed like an attractive material for impact energy absorption applications where damping capability is required such as in vehicles and buildings. Also when stainless steel foam is produced as stainless steel foam, the material density will be reduced thus the resulting foam will be a combination of light weight and high strength that can also be used in high strength applications. In our analysis, we tried to produce stainless steel foam through powder metallurgy in order to control mechanical properties in a better manner compared to the casting method. Also, we try to compare the pore morphology in foams on changing the space holder from accicular urea to crushed urea using FE-SEM. The properties of stainless steel foam, to a large extent, are found to depend on the arrangement of the pores which is decided by the space holder utilized during its synthesis using powder metallurgy route. The stainless steel obtained using acicular carbamide as space holder is found to possess acicular or irregular pores whereas those produced with crushed urea as space holder possesses nearly circular holes. Also, the previous foams are found to have better mechanical properties contributing towards more useful metallic foam.

Properties of Precipitation Hardening 17-4 PH Stainless Steel Manufactured by Powder Metallurgy Technology

2013 ◽  
Vol 811 ◽  
pp. 87-92 ◽  
Author(s):  
Jan Kazior ◽  
Aneta Szewczyk-Nykiel ◽  
Tadeusz Pieczonka ◽  
Marek Hebda ◽  
Marek Nykiel
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Powder Metallurgy ◽  
Ferritic Stainless Steel ◽  
Process Parameters ◽  
Stainless Steels ◽  
Precipitation Hardening ◽  
High Strength ◽  
Martensitic Stainless Steels ◽  
Heat Treated

Alloys from austenitic and ferritic stainless steel found to be satisfactory for a great many applications. However, for applications that require higher levels of strength and hardness from the martensitic grades are frequently specified. Martensitic stainless steels offer significantly higher strengths but have to low ductility. For this reason for application where high levels of strength and a moderate ductility is required, the precipitation strengthened stainless steels are often considered. One of the most popular alloy of this kind of stainless steel is 17-4 PH. The aim of the present paper was to examined the influence the process parameters in conventional powder metallurgy processing on the mechanical properties of the 17-4 PH alloy in both as-sintered and heat treated conditions. In was found that temperature of aged is a very sensitive parameter for obtained high strength and acceptable ductility.

The Effect of Different Composition of Stainless Steel (SS316L) Foam via Space Holder Method

2016 ◽  
Vol 1133 ◽  
pp. 310-313 ◽  
Author(s):  
Murni Faridah Mahammad Rafter ◽  
Sufizar Ahmad ◽  
Rosdi Ibrahim
Keyword(s):  
Stainless Steel ◽  
Powder Metallurgy ◽  
Sintering Process ◽  
Wear Performance ◽  
Space Holder ◽  
Powder Metallurgy Process ◽  
Lower Porosity ◽  
Steel Foam ◽  
Cold Pressed ◽  
Metallurgy Process

Stainless Steel materials (SS316L) generally known as a highly wear performance and resistant to corrosion. The purpose in this study is to produce the stainless steel foam and physical properties of sintered 316L stainless steel materials produced by powder metallurgy (P/M) method. In this paper, the method is based on using spherical urea as space holder was investigated. Then, the foams will be given to consider the properties of SS316L foam after sintering process. Powder metallurgy process needs to go through the mixing, pressing, sintering and analysis. The selected compositions of SS316L were varied from 50 wt % to 60 wt % SS316L, respectively while the remaining percentages are foaming agent. The SS316L powders were cold-pressed with 8 tons pressure and sintered at 1200°C via tube furnace. The SS316L foams were then characterised using Scanning Electron Microscopy (SEM) for morphological characterisation of the samples after sintering process. Lastly, porosity and density were tested for this sample. As a result, the composition with 60 wt % SS316L is provided higher bulk density and lower porosity which are 4.34 g/cm3 and 69.03 %, respectively.

scholarly journals Production of Porous Stainless Steel using the Space Holder Method

2021 ◽  
Vol 50 (2) ◽  
pp. 507-514
Author(s):  
Koon Tatt Tan ◽  
Norhamidi Muhamad ◽  
Andanastuti Muchtar ◽  
Abu Bakar Sulong ◽  
Yih Shia Kok
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Elastic Modulus ◽  
Powder Metallurgy ◽  
Yield Strength ◽  
Sintering Temperature ◽  
Volumetric Shrinkage ◽  
Metallic Foams ◽  
Space Holder ◽  
Porous Stainless Steel

Metallic foams and porous materials can be produced by various methods. Among the methods that can produce metallic foams and porous materials, powder metallurgy is a promising method. This study investigates the production of a porous stainless steel by the space holder method in powder metallurgy. A novel space holder i.e. glycine and binder consisting of polymethylmethacrylate and stearic acid are used. Different amounts of glycine are added to the mixture of stainless-steel powder and binder. Subsequently, each mixture is cold-pressed at a pressure of 9-ton m-2. The samples are sintered at 1050 and 1150 °C with holding times of 30, 60, and 90 min. The microstructures and physical and mechanical properties of the sintered samples are investigated. A porous stainless steel with porosity ranging from 30.8 to 51.4% is successfully fabricated. Results show that the glycine content and sintering parameters influence the properties of the porous stainless steel. The sintering temperature significantly affects volumetric shrinkage. Volumetric shrinkage decreases as the volume fraction of glycine increases to 30% whereas sintering temperature 1150 °C and holding time 90 min will increase the volumetric shrinkage. The compressive yield strength and corresponding elastic modulus are in the ranges of 22.9 to 57.6 MPa and 6.3 to 26.8 GPa, respectively. The samples produced have potential biomedical applications because their mechanical properties, yield strength and elastic modulus match those of human bones.

scholarly journals Synthesis and Characterization of Stainless Steel Foam Via Powder Metallurgy Taking Acicular Urea As Space Holder

2015 ◽  
Vol 12 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Shailendra Joshi ◽  
Gaurav Gupta ◽  
Mohit Sharma ◽  
Amit Telang ◽  
Taru Mahra
Keyword(s):  
Stainless Steel ◽  
Powder Metallurgy ◽  
High Strength ◽  
Strain Diagram ◽  
High Porosity ◽  
Aluminum Foams ◽  
Plateau Stress ◽  
Space Holder ◽  
Sem Micrograph ◽  
Energy Absorbing

Stainless steel foams are produced via powder metallurgy process taking acicular urea as space holder contributing porosity with 40-70 volume %. The resulting changes in microstructure of compact after each operation comprising cold compaction, pre-heating and sintering are discussed along with causes with the help of SEM micrograph. The processed foam samples using 40 % urea by volume are quite regular and acicular in shape but with increase in porosity regularity starts diminishing. It is observed that the foam samples with 40 % porosity doesn’t show any plateau stress as in aluminum foams but those with 50 % porosity (approximately 80 MPa maximum plateau stress) and 60 % porosity (approx.45MPa) shows plateau region in true stress-strain diagram during compression test due before final densification process. It is observed that with increasing porosity plateau stress decreases, since lesser force is required to densify the foam. Therefore the stainless steel foams with low porosity can be used in light weight high strength applications e.g. structures whereas with high porosity have impact energy absorbing applications e.g. damping elements in buildings or vehicles, etc.

ALLEGHENY LUDLUM TYPE 205

Alloy Digest ◽  
1997 ◽  
Vol 46 (10) ◽  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Magnetic Permeability ◽  
Cold Working ◽  
High Strength ◽  
Heat Treating ◽  
Austenitic Steels

Abstract Allegheny Stainless Type 205 is a chromium-manganese nitrogen austenitic high strength stainless steel that maintains its low magnetic permeability even after large amounts of cold working. Annealed Type 205 has higher mechanical properties than any of the conventional austenitic steels-and for any given strength level, the ductility of Type 205 is comparable to that of Type 301. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: SS-640. Producer or source: Allegheny Ludlum Corporation. Originally published March 1996, revised October 1997.

Development Of High-Strength Aluminum-Based Alloys By Synthesis Of New Multicomponent Quasicrystals

1998 ◽  
Vol 553 ◽  
Author(s):  
A. Inoue ◽  
H. M. Kimura
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Rapid Solidification ◽  
Future Development ◽  
High Strength ◽  
Supercooled Liquid ◽  
Engineering Properties ◽  
Atomic Configuration ◽  
Lanthanide Metal ◽  
Bulk Alloys

AbstractBy the control of composition, clustered atomic configuration and stability of the supercooled liquid in the rapid solidification and powder metallurgy processes, high-strength Al-based bulk alloys containing nanoscale nonperiodic phases were produced in AI-Ln-LTM, AI-ETM-LTM and Al-(V, Cr, Mn)-LTM (Ln=lanthanide metal, LTM=VII and VIII group metals, ETM=IV to VI group metals) alloys containing high Al contents of 92 to 95 at%. The nonperiodic phases are composed of amorphous or icosahedral (I) phase. In particular, the Al-based bulk alloys consisting of nanoscale I particles surrounded by Al phase exhibit much better mechanical properties as compared with commercial Al base alloys. The success of producing the Al-based alloys with good engineering properties by use of I phase is important for future development of I-based alloys as practical materials.

Microstructure Evolution and Deformation Mechanisms of Harmonic Structure Designed Materials

2016 ◽  
Vol 879 ◽  
pp. 145-150
Author(s):  
Kei Ameyama ◽  
Sanjay Kumar Vajpai ◽  
Mie Ota
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Powder Metallurgy ◽  
Early Stage ◽  
High Strength ◽  
Plastic Instability ◽  
Structure Design ◽  
Harmonic Structure ◽  
Homogeneous Microstructure ◽  
Macro Scale

This paper presents the novel microstructure design, called Harmonic Structure, which gives structural metallic materials outstanding mechanical properties through an innovative powder metallurgy process. Homogeneous and ultra-fine grain (UFG) structure enables the materials high strength. However, such a “Homo-“ and “UFG” microstructure does not, usually, satisfy the need to be both strong and ductile, due to the plastic instability in the early stage of the deformation. As opposed to such a “Homo-and UFG“ microstructure, “Harmonic Structure” has a heterogeneous microstructure consisting of bimodal grain size together with a controlled and specific topological distribution of fine and coarse grains. In other words, the harmonic structure is heterogeneous on micro-but homogeneous on macro-scales. In the present work, the harmonic structure design has been applied to pure metals and alloys via a powder metallurgy route consisting of controlled severe plastic deformation of the corresponding powders by mechanical milling or high pressure gas milling, and subsequent consolidation by SPS. At a macro-scale, the harmonic structure materials exhibited superior combination of strength and ductility as compared to their homogeneous microstructure counterparts. This behavior was essentially related to the ability of the harmonic structure to promote the uniform distribution of strain during plastic deformation, leading to improved mechanical properties by avoiding or delaying localized plastic instability.

scholarly journals Mechanical properties of 17-4PH stainless steel foam panels

2007 ◽  
Vol 456 (1-2) ◽  
pp. 305-316 ◽  
Author(s):  
S.V. Raj ◽  
L.J. Ghosn ◽  
B.A. Lerch ◽  
M. Hebsur ◽  
L.M. Cosgriff ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Steel Foam
Sign in / Sign up

Export Citation Format

Share Document