摘要
经成分优化获得一种新型的贝氏体轴承钢GCr15SiMoAl,通过盐浴等温淬火不同时间及油淬工艺获得不同的组织,利用Gleeble3500研究了试验用钢充氢前后的压缩变形行为,并与常规的GCr15轴承钢进行了对比。结果表明,GCr15SiMoAl轴承钢经0.5h等温获得了贝氏体铁素体、残留奥氏体及马氏体的复合组织,其综合压缩性能最好;随着盐浴等温时间的延长,抗压强度逐渐降低,相对压缩率先升高后降低。且GCr15SiMoAl轴承钢在所有工艺下获得的性能均优于传统的GCr15轴承钢。氢对轴承钢的抗压强度影响较小,但是由于氢会促进残留奥氏体发生应变诱发马氏体转变,严重降低了轴承钢的塑性。
Different heat treatments of isothermal quenching in salt bath for different time and oil quenching were applied to a new bainite bearing steel GGr15SiMoAl. The compressive deformation behavior of the heat-treated GCr15SiMoAl bearing steel with and without hydrogen charging was investigated on a Gleeble 3500 thermal-mechanical testing system, and the result was compared to that of the traditional GCr15 bearing steel. The results show that the GGr15SiMoAI steel with the mixed microstructure consisting of bainitic ferrite, retained austenite and martensite obtained by isothermal quenching at 230 ℃ for 0.5 h exhibits the excellent compressive deformation behavior; with the increase of isothermal time, the compressive strength is gradually reduced and the compression ratio increases firstly and then decreases. The performances of the GCr15SiMoAl bearing steel after isothermal quenching and oil quenching are better than that of the traditional GCr15 bearing steel by conventional oil quenching. Hydrogen charging has negligible influence on the compressive strength of the hearing steel, however, the hydrogen charging deteriorates the plasticity of the bearing steel significantly due to the strain- induced transformation from the retained austenite to martensite in the hydrogen-charged steel under compression loading.
作者
苏丽婷
张福成
郑春雷
尤蕾蕾
SU Li-ting ZHANG Fu-cheng ZHENG Chun-lei YOU Lei-lei(State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China Luoyang LYC Bearing Co Ltd, Luoyang, Henan 471039)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第2期111-117,共7页
Transactions of Materials and Heat Treatment
基金
国家高技术研究发展计划资助项目("863"计划
2012AA03A504)
河北省高等学校科学技术研究项目(QN2015100)
燕山大学青年教师自主研究计划项目(15LGB006)
关键词
轴承钢
无碳化物贝氏体
压缩
氢脆
bearing steel
bainite without carbide
compression
hydrogen embrittlement
