摘要
利用光学显微镜、扫描电镜、力学性能测试等方法,分析了10CrNi_(2)Mo_(3)Cu_(2)V耐热钢锻件的脆化原因,并研究了钢在1050~850℃区间的高温析出行为,及其对冲击韧性的影响。结果表明,锻件脆化由粗大的链状M6C相引起,950~850℃温度区间,钢中发生M_(6)C相的高温析出行为,导致冲击韧性恶化。析出温度区间内,降低温度、延长时间均能促进析出相的形核与长大,使M_(6)C相含量增加,尺寸长大,分布更加聚集,逐渐形成链状形貌。Mo元素偏析能够提高M_(6)C相的开始析出温度、增加相含量。锻造温度是影响高温析出行为的关键因素,应控制终锻温度不小于950℃,避免锻后脆化。
The reason for brittleness of 10CrNi_(2)Mo_(3)Cu_(2)V heat-resistant steel forging was analyzed by optical microscope, SEM and test of mechanical properties. High temperature precipitation behavior of the steel in temperature interval of 1 050-850 ℃ which influences impact toughness was also investigated. The results show that M_(6)C phase distributes continuously after forging and causes the forging becoming brittleness. The steel occurs high precipitation behavior of M_(6)C phase that causes impact toughness deteriorating in temperature interval of 950-850 ℃. Decreasing temperature or prolonging soaking time could accelerate nucleation and growth of M_(6)C phase, which make amount increasing, size growing up. And then the precipitated phase forms continuously distributed morphology at last. Segregation of Mo element could decrease initiated precipitation temperature and content of M6C phase. Forging temperature is the critical influence factor of high temperature precipitation. As result, final forging temperature should not below 950 ℃ to avoid brittleness after forging.
作者
赵吉庆
杨钢
包汉生
彭涛
ZHAO Jiqing;YANG Gang;BAO Hansheng;PENG Tao(Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;University of Science and Technology Beijing,Beijing 100083,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2021年第1期56-63,共8页
Journal of Iron and Steel Research
基金
国家重点研发计划资助项目(2016YFB0300203)。
关键词
M6C相
高温析出
脆化机制
终锻温度
M6C phase
high temperature precipitation
brittleness mechanism
final forging temperature
