Journal ArticleDOI
Effect of Austenitizing Heat Treatment on the Microstructure and Hardness of Martensitic Stainless Steel AISI 420
L. D. Barlow,M. Du Toit +1 more
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TLDR
In this article, the effect of austenitizing on the microstructure and hardness of two martensitic stainless steels was examined with the aim of supplying heat-treatment guidelines to the user that will ensure a martensite structure with minimal retained austenite, evenly dispersed carbides and a hardness of between 610 and 740 HV (Vickers hardness) after quenching and tempering.Abstract:
The effect of austenitizing on the microstructure and hardness of two martensitic stainless steels was examined with the aim of supplying heat-treatment guidelines to the user that will ensure a martensitic structure with minimal retained austenite, evenly dispersed carbides and a hardness of between 610 and 740 HV (Vickers hardness) after quenching and tempering. The steels examined during the course of this examination conform in composition to medium-carbon AISI 420 martensitic stainless steel, except for the addition of 0.13% vanadium and 0.62% molybdenum to one of the alloys. Steel samples were austenitized at temperatures between 1000 and 1200 °C, followed by oil quenching. The as-quenched microstructures were found to range from almost fully martensitic structures to martensite with up to 35% retained austenite after quenching, with varying amounts of carbides. Optical and scanning electron microscopy was used to characterize the microstructures, and X-ray diffraction was employed to identify the carbide present in the as-quenched structures and to quantify the retained austenite contents. Hardness tests were performed to determine the effect of heat treatment on mechanical properties. As-quenched hardness values ranged from 700 to 270 HV, depending on the amount of retained austenite. Thermodynamic predictions (using the CALPHAD™ model) were employed to explain these microstructures based on the solubility of the carbide particles at various austenitizing temperatures.read more
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Journal ArticleDOI
Influence of tempering treatment on microstructure and pitting corrosion of 13 wt.% Cr martensitic stainless steel
Sunil Kumar Bonagani,Sunil Kumar Bonagani,Vishwanadh Bathula,Vivekanand Kain,Vivekanand Kain +4 more
TL;DR: In this article, the authors reported that the Pitting resistance for tempered condition was lower than the austenitized condition with least resistance at 550 °C. The observation was attributed to the presence of a Fe-rich surface film and massive carbide precipitation with a Cr depletion zone of 7-9 nm at carbide interface.
Journal ArticleDOI
Fabrication and Characterization of AISI 420 Stainless Steel Using Selective Laser Melting
TL;DR: In this article, the fabrication of AISI 420 stainless steel using selective laser melting (SLM) for the application of plastic injection molding was investigated, and the microscopic microstructure, phase composition, and hardness were characterized using scanning electron microscopy, X-ray diffraction, and Rockwell hardness test, respectively.
Journal ArticleDOI
Correlative Microstructure Analysis and In Situ Corrosion Study of AISI 420 Martensitic Stainless Steel for Plastic Molding Applications
Krishnan Hariramabadran Anantha,Cem Örnek,Sebastian Ejnermark,Anna Medvedeva,Johnny Sjöström,Jinshan Pan +5 more
TL;DR: In this article, the corrosion behavior of tempered AISI 420 martensitic stainless steel (MSS) was studied by in-situ atomic force microscopy (AFM) in 0.1M NaCl and correlated with the microstructure.
Journal ArticleDOI
In-situ quench and tempering for microstructure control and enhanced mechanical properties of laser cladded AISI 420 stainless steel powder on 300M steel substrates
Shi Da Sun,Daniel Fabijanic,Cameron Barr,Qianchu Liu,Kevin Walker,Neil Matthews,Nicholas Orchowski,Mark Alan Easton,Milan Brandt +8 more
TL;DR: In this article, the microstructure, tensile, and wear properties of a geometrically repaired ultra-high strength martensitic 300M steel were evaluated using laser cladding.
Journal ArticleDOI
Influence of hydrogen on mechanical properties and fracture of tempered 13 wt% Cr martensitic stainless steel
B. Sunil Kumar,B. Sunil Kumar,Vivekanand Kain,Vivekanand Kain,Manpreet Singh,Bathula Vishwanadh +5 more
TL;DR: In this paper, slow strain rate tensile (SSRT) tests were performed on tempered 13-wt% Cr martensitic stainless steel with hydrogen charging during straining and separately on hydrogen pre-charged tensile specimens.
References
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Principles of Materials Science and Engineering
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Journal ArticleDOI
Complex carbide growth, dissolution, and coarsening in a modified 12 pct chromium steel—an experimental and theoretical study
Anders Bjärbo,Mats Hättestrand +1 more
TL;DR: In this paper, the growth, dissolution, and coarsening of complex carbides at 750 °C in a modified 12 pct chromium steel was simulated based on the assumption that thermodynamic equilibrium is established locally at the moving phase interface.
Journal ArticleDOI
Control of M23C6 carbides in 0.45C–13Cr martensitic stainless steel by means of three representative heat treatment parameters
TL;DR: In this paper, the influence of three parameters (heating temperature, heating rate and cooling rate) on the area percentage of M23C6-type carbides in the quenching microstructures of 0.45C-13Cr martensitic stainless steel has been studied.