GCr15粉末冶金烧结钢中残余奥氏体的磁性无损检测  

Magnetic nondestructive inspection of retained austenite in GCr15 powder metallurgy

作　　者：崔文琪[1] 郭丽波[1] 李峰[2] 

机构地区：[1]莱芜职业技术学院莱芜市粉末冶金先进制造重点实验室,莱芜271100 [2]上海大学精密机械系,上海200072

出　　处：《现代制造工程》2014年第7期99-102,共4页Modern Manufacturing Engineering

基　　金：山东省大型科学仪器设备升级改造技术研究专项项目(2013SJGZ27)

摘　　要：GCr15粉末冶金烧结钢被普遍用于制造各种模具,硬度要求较高,但其中的残余奥氏体会使硬度降低,因此,检验残余奥氏体的体积分数是非常重要的。含有残余奥氏体的粉末冶金磁化曲线和电导率不同于普通粉末冶金,所以,基于电磁检测方法通过测量电磁性质的变化来检测残余奥氏体的体积分数是可能的。GCr15粉末冶金烧结钢中残余奥氏体的电磁检测技术是基于非线性有限单元法的三维六面体边缘检测(有限元法),解释说明了利用该检验方法检测残余奥氏体的可能性,并经过了严格的实验验证。Since the GCr15 powder metallurgy is used for the various mould production,the hardness of it should be high. The hardness is rapidly reduced by the appearance of the retained austenite in GCr15. Therefore,the inspection of volume fraction of retained austenite in GCr15 is important. The B-H curve and the conductivity of the GCr15 powder metallurgy containing the austenite are different from those of powder metallurgy. Then,the detection of retained austenite is possible by measuring the change of electromagnetic properties using anelectromagnetic inspection method. The electromagnetic inspection technique of retained austenite in the GCr15 powder metallurgy is examined using 3-D edge-based hexahedral nonlinear Finite Element Method（FEM）. The possibility of detecting the retained austenite using the proposedinspection method is illustrated. In addition,the experimental verification is also carried out.

关 键 词：电磁无损检测 残余奥氏体 GCr15粉末冶金烧结钢 三维有限元法 

分 类 号：TG115.28[金属学及工艺—物理冶金]