Effect of Quenching, Lamellarizing and Tempering Process on Strength and Toughness of 9NiCrMo Steel
CHENG Jian-hua, SHEN Jun-chang, HE Yi-zhu, SU Hang, CUI Li-hui
1. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, Anhui, China 2. Institute for Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：The mechanical properties of 9NiCrMo steel subjected to quenching and tempering (QT) and quenching, lamellarizing and tempering (QLT) heat treatments was investigated, and the microstructure was systematically studied by means of optical microscope(OM) and scanning electron microscope (SEM). Moreover, quantity and distribution of reversed austenite in 9NiCrMo steel after QLT heat treatment was studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Based on the experimental results, the effect and mechanism of QLT heat treatment on mechanical properties of 9NiCrMo steel were analyzed. The results indicate that QLT heat treatment can improve the cryogenic toughness of 9NiCrMo steel effectively without reducing the strength. And dual phase structure and the changed distribution of the reversed austenite after QLT heat treatment are the main reasons which improve the cryogenic toughness.
程建华 沈俊昶 何宜柱 苏 航 崔黎辉. 两相区热处理工艺对9NiCrMo钢强韧性的影响[J]. 钢铁, 2014, 49(9): 87-91.
CHENG Jian-hua, SHEN Jun-chang, HE Yi-zhu, SU Hang, CUI Li-hui. Effect of Quenching, Lamellarizing and Tempering Process on Strength and Toughness of 9NiCrMo Steel. Iron and Steel, 2014, 49(9): 87-91.
2014, Vol. 49 
