会议专题

MEASUREMENT UNCERTAINTY OF MECHANICAL PROPERTY IN TENSILE TESTS: STRAIN RATE EMBRITTLEMENT OF HSLA STEELS

  International Standard ISO 6892-2 maintains that strain rate variations can induce the measurement uncertainty of mechanical properties in tensile testing,which will imperil the reliability of tension tests.In this paper,the measurement uncertainty of reduction in area relative to strain rate,called as strain rate embrittlement,is first described experimentally for some micro-alloy steels.Then the measurement uncertainty is clarified based on microscopic theory of elastic deformation in metals.It is shown that the elastic deformation of tension test induces the segregation of impurities to grain boundaries and the relevant embrittlement which produces the measurement uncertainty of reduction in area in tensile testing.This work gives a theoretical basis for correcting the present tension testing system to avoid the measurement uncertainty of mechanical property.

Tension tests Measurement uncertainty Elastic deformation Segregation

Tingdong Xu Chong Shao Kai Wang

Superalloy Department,Central Iron & Steel Research Institute,Beijing,100081,P R China

国内会议

第七届低合金高强度钢国际会议

杭州

英文

229-235

2015-11-11(万方平台首次上网日期,不代表论文的发表时间)