摘要
采用高碳和中碳低温贝氏体转变工艺(0.95C钢为200℃等温10 d,0.30C钢为320℃等温1 d)研究了残留奥氏体对微纳结构钢塑韧性的影响,对不同试样的显微组织、各相体积分数、伸长率和冲击韧性进行观察、检测和分析。试验结果表明,中碳钢贝氏体转变的塑韧性明显高于高碳钢贝氏体转变,主要原因是中碳钢贝氏体转变中存在一定的亚微米级薄膜状残留奥氏体,在拉伸或冲击过程中引起的残留奥氏体的塑性变形,使断裂的能量增加,可以显著提高样品的塑韧性。
The effect of retained austenite on the plasticity and toughness in micro/nano-structured steels was analyzed by high and medium carbon bainitic transformation processes(200℃for 10 days in 0.95 C and 320℃for 1 day in 0.30 C steel).The microstructure,phase fraction,elongation and impact toughness of different steels were observed,detected and analyzed.The results show that the plasticity and impact properties of medium-carbon bainitic transformation were significantly higher than those of high-carbon bainitic transformation.The main reason is that some retained austenite in shape of sub-micron film is formed in medium-carbon bainitic transformation.The plastic deformation of the retained austenite in the stretching or impact process can significantly improve the plasticity and toughness of the steel since the fracture energy was increased.
作者
万响亮
胡锋
成林
黄刚
张国宏
吴开明
WAN Xiang-liang;HU Feng;CHENG Lin;HUANG Gang;ZHANG Guo-hong;WU Kai-ming(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2019年第3期305-311,共7页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51601134)
关键词
低温贝氏体
热处理工艺
残留奥氏体
伸长率
冲击韧性
low temperature bainite
heat treatment process
retained austenite
elongation
impact toughness
