摘要
为探索硬度法测量残余应力技术,基于金属材料硬度与残余应力、微观组织的相关性,针对45钢Φ150 mm×150 mm淬火试件,采用剥层法测试试样内部硬度、残余应力,观察微观金相,建立硬度和残余应力间的定量关系;并从微观角度分析了三者间的相关性机理。研究结果表明,残余应力大小和马氏体转变充分程度有关;马氏体转变越充分,残余应力压应力值越高。硬度和相的种类有关,马氏体相的硬度最高,混合组织硬度相比之下有所下降,内部珠光体+铁素体硬度维持在HRC20左右基本不变。等效残余应力和硬度变化量之间符合良好的幂函数关系。为硬度评价残余应力技术的实现提供了一个参考研究途径。
To explore the method of assessing residual stress through hardness,hardness,residual stress and microstructure in a quenching test specimen（ Φ150 mm × 150 mm） were measured by layer removal method,and the correlation mechanism among them were analyzed. The results show that the value of residual stress is related to the sufficient degree of martensitic transformation： the more martensitic,the higher residual compress stress. Hardness relates to the phases of microstructure： the highest hardness is in the martensitic,the higher is in the mixed phase,and the hardness is round HRC 20 in the pearlite ＋ ferrite phase. The Mises residual stress shows a good power function relationship with harness.
出处
《科学技术与工程》
北大核心
2017年第34期191-196,共6页
Science Technology and Engineering
基金
国家科技重大专项(2012ZX04010-011)资助
关键词
应力场
硬度
残余应力
微观组织
剥层法
microstructure
quenching test specimen
layer removal method
correlation mechanism
residual stress
