Mechanical Properties of Martensitic Stainless Steel (AISI420) Subjected to Conventional and Cryogenic Treatments

Mohamed, Hareer S.; Ataiwi, Ali H.; Dawood, Jamal J.

doi:10.30684/etj.v38i8A.517

	Mechanical Properties of Martensitic Stainless Steel (AISI420) Subjected to Conventional and Cryogenic Treatments
Engineering and Technology Journal
Article 1, Volume 38, 8A, 2020, Pages 1096-1105 PDF (1.13 M)
Document Type: Research Paper
DOI: 10.30684/etj.v38i8A.517
Authors
Hareer S. Mohamed^* ¹; Ali H. Ataiwi²; Jamal J. Dawood¹
¹Materials Engineering Department- University of Technology-Iraq.
²University of Technology, Materials Engineering Department
Abstract
Martensitic Stainless Steel (AISI420) MSS are vastly used because of their properties conventional which mix good mechanical and corrosion resistance. Cryogenic up to -196°C for different soaking time and heat treatments at (1000,500,200°C) for 15 minutes is one of the ways that used to enhance mechanical properties of these steels by means transformation of retained austenite, deformation regarding martensite then carbide refinement. the result showed an increase in tensile strength of samples that were treated cryogenically and tempered at 500°C was 933 (MPa) compared to samples that just treated conventionally in austenitizing and tempering at the same temperature that was 880 (MPa). The hardness values increased considerably to 414HV and 321 HV for the specimen that tempered at 200°C and 500°C respectively, precipitation of small carbides was observed that this is responsible for the improvement in the mechanical properties of the material.
Keywords
Martensitic Stainless Steel (MSS); Cryogenic Treatment; Hardness; Tensile test

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