Transactions of Materials and Heat Treatment. 2011, (03) Core

Research on a new nitrogen-bearing austenitic hot work die steelChinese Full Text

JIANG Hao,WU Xiao-chun(School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

Abstract: A new nitrogen-bearing austenitic hot work die steel was processed by different heat treatments.Strength,toughness and heat stability of the steel were tested.The coefficient of expansion was analyzed by a DIL805A thermal dilatometer.The microstructure was observed and researched by means of OM,SEM,XRD and TEM.The results show that the optimum heat treatment for the test steel is aging at 720 ℃ for 2 h after solution treatment at 1200 ℃,and after the heat treatment,hardness of the steel is 46 HRC and the impact toughness of un-notched specimen reaches 150 J.The aged test steel performs good heat stability,and the hardness of the steel is unchanged at 700 ℃ for 20 h and reduced to 44 HRC at 780 ℃ for 20 h.The major precipitate is V（C,N） phase with the mass fraction of 4% in the steel after aging,and the size of the precipitates working as dispersion strengthening phase is 10-20 nanometers.

Keywords：

nitrogen austenitic steel; heat stability; precipitate;

DOI：
10.13289/j.issn.1009-6264.2011.03.015
Series：
Subject：
Classification Code：
TG142.15

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Research on a new nitrogen-bearing austenitic hot work die steelChinese Full Text

JIANG Hao,WU Xiao-chun(School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

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