REIS, ADRIANO G.REIS, DANIELI A.P.ABDALLA, ANTONIO J.OTUBO, JORGECOUTO, ANTONIO A.PIORINO NETO, FRANCISCO2018-02-192018-02-192017REIS, 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. <b>Materials Science Forum</b>, v. 899, p. 436-441, 2017. DOI: <a href="https://dx.doi.org/10.4028/www.scientific.net/MSF.899.436">10.4028/www.scientific.net/MSF.899.436</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/28494.1662-9752http://repositorio.ipen.br/handle/123456789/28494The 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.436-441openAccessplasmanitridationtensile propertieshot cellsfracturesmaraging steelsArtigo de periódico89910.4028/www.scientific.net/MSF.899.436