30CrMnSiA钢筒形件铬偏析缺陷研究

发布时间：2018-07-09 14:41

本文选题：CrMnSiA钢 + 筒形件　；参考：《国防制造技术》2016年03期

【摘要】：本文对30CrMnSiA钢薄壁筒形件上出现的疑似裂纹、划痕、发纹的不明缺陷进行了外观形貌、磁粉探伤、金相、电镜能谱等检测分析,并进行了切向力学性能对比测试。分析检测和对比测试的结果表明:上述产品上出现的缺陷并不是真正的裂纹、划痕、发纹,而是由原材料中的Cr成分偏析所导致的较光亮的线条状、细网带状缺陷。在偏析区内,合金元素Cr的含量显著高于正常材料含量,在原材料供应状态,其缺陷很难发现,而在真空淬火及真空回火之后,偏析区比正常材料区光亮,才在机械加工和磁粉探伤检验时发现;这种Cr偏析缺陷不能提高30CrMnSiA钢产品材料的切向强度,而有可能显著降低材料的切向塑性。
[Abstract]:In this paper, the appearance, magnetic particle inspection, metallography and electron microscope energy spectrum of the unknown defects of the thin-walled cylindrical parts of 30CrMnSiA steel are examined and analyzed, and the tangential mechanical properties are compared and tested. The results of analysis and contrast tests show that the defects in the above products are not real cracks, scratches and hairlines, but rather brighter line and fine mesh defects caused by Cr segregation in raw materials. In the segregation zone, the content of alloy element Cr is significantly higher than that of the normal material. It is difficult to find the defects in the raw material supply state, but after vacuum quenching and vacuum tempering, the segregation zone is brighter than the normal material area. It was found in mechanical processing and magnetic particle inspection that the Cr segregation defect could not increase the tangential strength of 30CrMnSiA steel, but could significantly reduce the tangential plasticity of 30CrMnSiA steel.
【作者单位】：江南工业有限公司;湘潭大学机械工程学院;
【分类号】：TG142.15

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