MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effects of Heat Treatment Conditions on Formation of Expanded-Austenite Phase in Austenitic Stainless Steels by Combining Active Screen and DC Plasma Carburizing Processes
Nobuhiko SatomiNobuyuki KanayamaYouichi WatanabeOsamu Takai
Author information
JOURNALS FREE ACCESS FULL-TEXT HTML

2017 Volume 58 Issue 8 Pages 1181-1189

Details
Abstract

A low temperature plasma carburizing process can produce an expanded-austenite layer (generally called the S phase), which has high hardness and corrosion resistance at the surface of austenitic stainless steels. We have investigated S phase formation behaviors by using a combined process of active screen and DC plasma carburizing for austenitic stainless steels such as JIS SUS304 and 316 with the aim of developing a highly effective and efficient production technique. The influence of carburizing parameters (processing temperature, time, gas atmosphere, etc.) on the formation of the S phase was studied in terms of thickness, hardness, carbon concentration, lattice constant, and residual stress. The mechanical properties and corrosion resistances of the obtained S phases were also evaluated by using a ball-on-disk test and a salt spray test (SST). The results show that S phases produced efficiently by the combined process under a condition of 733 K and a 10.5 vol% of CH4 gas ratio have both excellent wear and corrosion resistances.

 

This Paper was Originally Published in Japanese in J. Jpn. Soc. Heat Treatment 56 (2016) 352–360.

Information related to the author
© 2017 The Japan Society for Heat Treatment
Previous article Next article
feedback
Top