摘要
应用平衡晶界偏聚理论模拟了应力与回火脆化相互作用后的杂质元素P的晶界偏聚过程,通过俄歇电子能谱试验对模拟计算结果进行验证,理论计算与试验结果的一致性表明:应力降低了杂质元素P的扩散系数,在无应力、468℃回火脆化处理过程中,杂质元素P的扩散系数为1.62×10-20m2/s,而在146.68 MPa拉应力作用下,杂质元素的扩散系数降低为1.28×10-20m2/s;应力对2.25Cr-1Mo钢回火脆化具有一定的阻碍作用,且这种作用随着回火脆化程度的增加而逐渐增大,二者满足Δcp(S)=0.002 exp(cp/0.292)+0.053关系.
The segregation concentration of impurity element P induced by temper embrittlement and stress was simulated by equilibrium grain boundary segregation theory.Auger electron spectroscopy analysis was used to certify the calculated results.The consistency of simulated and experimental results showed that the diffusion coefficient of impurity element P was reduced by the applied stress,the diffusion coefficient of impurity element P was 1.62×10-20 m2/s for the stress free materials and 1.28×10-20 m2/s for the 146.68 MPa tensilly stressed materials.They were thermally treated at 468 ℃.The applied stress weakened temper embrittlement of 2.25Cr-1Mo steel increased with increase of embrittlement.The relationship between the reduced embrittlements by applied stress and the temper embrittlement was satisfied with the function of Δcp（S）=0.002 exp（cp/0.292）＋0.053.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2010年第5期16-19,共4页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省2009年研究生科研创新工程基金资助项目(CX09B_131Z)
关键词
晶界偏聚
回火脆化
应力
扩散系数
俄歇电子能谱
grain boundary segregation
temper embrittlement
stress
diffusion coefficient
Auger electron spectroscopy
