Hot tensile behavior and fracture characteristics of a plasma nitrided maraging 300 steel
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Materials Science Forum
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The influence of plasma nitriding of a maraging 300 steel on mechanical properties at
high temperature has been studied. Samples were tensile tested at 600°C in four conditions: solution
treated (MAR-S), solution treated and aged (MAR-SA), solution treated and plasma nitrited
(MAR-SP) and solution treated, aged and plasma nitrited (MAR-SAP). In the same sequence, the
yield strength and ultimate tensile strength increased slightly respectively from 1073 to 1189 MPa
and 1174 to 1301 MPa, an increase of about 10% due to plasma nitriding. All the samples presented
similar values of elongation, around 18%, but the cross section area reduction decreased
significantly by plasma nitriding from ~70% for MAR-S and MAR-SA to ~45% for MAR-SP and
MAR-SAP, that is an decrease of 36% in average. This decrease is attributed to brittle fracture
nucleated at 50 μm thick iron nitride layer. The inner fracture surface of the tensile tested specimens
was predominantly ductile presenting characteristic microcavities.
Como referenciar
REIS, ADRIANO G.; REIS, DANIELI A.P.; ABDALLA, ANTONIO J.; OTUBO, JORGE; COUTO, ANTONIO A.; PIORINO NETO, FRANCISCO. Hot tensile behavior and fracture characteristics of a plasma nitrided maraging 300 steel. Materials Science Forum, v. 899, p. 436-441, 2017. DOI: 10.4028/www.scientific.net/MSF.899.436. Disponível em: http://repositorio.ipen.br/handle/123456789/28494. Acesso em: 30 Dec 2025.
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