The Effect of High Temperature Gas Nitriding and Tempering on the Phase Transformation in AISI D2 Steel
The effects of the high temperature gas nitriding(HTGN), tempering and subzero treatment of the AISI D2 steel have been investigated. The HTGN treatment was carried out at 1050℃, 1100℃ and 1150℃ for 1hr. In an atmosphere of 1kg/cm2 nitrogen gas. Tempering and double-tempering were performed at 550℃ for lhr. The surface layer of HTGN treated steel appeared the precipitates of M2N, M7C3 and M23C6 in the matrix of austenite. However, the interior region, where the nitrogen was not permeated, exhibited martensite with the precipitation of carbides. The nitrogen content of the surface layer appeared ～1.35 wt.％,～0.83 wt.％ and ～0.56 wt.％ at the HTGN treatment temperature of 1050℃, 1100℃ and 1150℃, respectively. The surface hardness of double-tempered and subzero-treated steel measured maximum value of 828Hv, 960Hv, 750HV after HTGN treatment at the 1050℃, 1100℃ and 1150℃, respectively. It increased above 230～420Hv compared with the HTGN treated steel due to the decrease in retained austenite and existence of fine precipitates.
Gas nitriding HTGN AISI D2 steel Double tempering and Subzero treatment
Jung Hyun Kong Han Yong On Sang Jun Park Chang Yong Kang Young Hee Kim Jang Hyun Sung
Department of Materials Science and Engineering,Dong-A University,840 Hadan-dong,Saha-gu,Busan 604-7 Division of Materials Science and Engineering,Pukyong national University,Busan,Korea Center for Advanced Net Shape Manufacturing and Clean Process,Dong-A University,840 Hadan-dong,Saha-
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
330-335
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）