Hot tensile behavior and fracture characteristics of a plasma nitrided maraging 300 steel

Reis A.G.; Reis D.A.P.; Abdalla A.J.; Otubo J.; Couto A.A.; Neto F.P.

Hot tensile behavior and fracture characteristics of a plasma nitrided maraging 300 steel

Tipo

Artigo de evento

Data de publicação

2017

Periódico

Materials Science Forum

Citações (Scopus)

4

Autores

Reis A.G.
Reis D.A.P.
Abdalla A.J.
Otubo J.
Couto A.A.
Neto F.P.

Resumo

© 2017 Trans Tech Publications, Switzerland.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.

Assuntos Scopus

Cross-section area , Fracture characteristics , Fracture surfaces , Hot tensile , Mechanical properties at high temperatures , Plasma nitrided , Plasma nitriding , Ultimate tensile strength