Retained austenite effect on AISI D2 steel block dimensional stability
Retained austenite, a meta-stable phase of quenched steel at room temperature, can be transformed into martenite using sub-zero treatment or mechanical stress. The large amount of retained austenite in quenched steel will cause dimensional changes in steel specimens due to the 4％ volume expansion from the austenite into martensite. Dimensional stability is an important requirement for cold work molds and retained austenite must be carefully controlled using tempering and cryogenic treatments. This paper studies the relation between the amount of retained austenite and degree of shape change in AISI D2 steel blocks over 6 months. D2 steel has 15.4％ retained austenite using conventional heat treatment. The retained austenite can be reduced to 4.0％ or less using cryogenic treatment and tempering at 200℃.The length, width and height of the block and amount of retained austenite were measured at 6 months of age. From the experimental results dimensional change of 0.24 μm was obtained for a D2 specimen 48 mm in length with 4.0％ retained austenite in the block.
retained austenite dimensional cryogenic
Yang-Yu Su Liu-Ho Chiu Tao-Liang Chuang Chien-Lung Huang Cheng-Yen Wu
Department of Materials Engineering, Tatung University 40, Sec. 3,Zhongshan N. Rd, Taipei City 104, Metal Industries Research & Development Centre 1001 Kaonan Highway, Kaohsiung811, Taiwan (R.O.C.)
国际会议
北京
英文
194-198
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）