30CrMnSiA钢锻件性能不合格原因分析
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摘要
30CrMnSiA钢锻件力学性能检验不合格。本文对不合格试样和合格试样进行了对比观察、断口分析、能谱扫描、显微硬度和金相分析。结果表明:不合格拉伸试样为脆性断裂,断面存在条带状分布的沿晶断裂区域;沿晶断裂区域Cr、Mn、Si元素的偏聚加剧了P、Sn、Sb、As等杂质元素的偏聚程度,导致晶界脆化,发生了高温回火脆性。
The mechanical properties of 30 CrMnSiA steel forgings are not qualified during the test. The unqualified samples and the qualified samples were contrasted by macro-observation, fracture analysis, energy spectrum scanning,micro-hardness and metallographic analysis. The results show that the unqualified tensile specimen is brittle fracture, and there is a strip-shaped intergranular fracture zone in the section. The segregation of Cr, Mn and Si elements in intergranular fracture zone increases the degree of segregation of impurity elements such as P, Sn, Sb, As, which leads to grain boundary embrittlement and high temperature tempering brittleness.
The mechanical properties of 30 CrMnSiA steel forgings are not qualified during the test. The unqualified samples and the qualified samples were contrasted by macro-observation, fracture analysis, energy spectrum scanning,micro-hardness and metallographic analysis. The results show that the unqualified tensile specimen is brittle fracture, and there is a strip-shaped intergranular fracture zone in the section. The segregation of Cr, Mn and Si elements in intergranular fracture zone increases the degree of segregation of impurity elements such as P, Sn, Sb, As, which leads to grain boundary embrittlement and high temperature tempering brittleness.
引文
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[4]谈金祝.Auger电子能谱分析方法及其在2.25Cr-lMo钢回火脆性中的应用[J].南京工业大学学报,2003,25(1):73-76.
[5]周昌玉,孙宇,张国栋.2.25Cr-1Mo合金钢回火脆化过时效现象的研究[J].特殊钢,2006,27(2):6-8.
[6]佐藤新吾,松居进,马兴龙.压力容器用Cr-Mo钢的回火脆性[J].大型锻件,1981(4):40-48.
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