An analysis of crack evolution of a 12Cr13 stainless steel during forging process

Case studies in engineering failure analysis Pub Date : 2015-10-01 DOI:10.1016/j.csefa.2015.10.002

Wei-min Guo , Na Xu , Ning Ding , Jun-bo Shi , C.M. Lawrence Wu

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引用次数: 2

Abstract

The analysis of an abnormal crack of a forging plate is presented in this work. The crack was found after forging process. Macro-analysis, SEM, composition inspection, metallographic analysis, inclusion analysis, EPMA and EDS were implemented. SEM shows that cleavage fracture is the main feature of the fracture surface, according to which it can be decided that the fracture is brittle fracture. XRF and carbon and sulphur analyzer indicate regular composition condition of the plate. EPMA and EDS suggest phosphorus segregation spread a lot around the crack. The results indicate that: brittleness caused by phosphorus segregation around crack zone is the main reason that cracks generate in the 12Cr13 steel during forging. As all we know, phosphorus has deleterious effect on toughness of steel because of its enrichment on grain boundaries, which can weaken the bond strength of grain boundary. Its existence should be avoided and microstructure of the steel should be homogeneous when good plasticity and toughness are wanted.

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12Cr13不锈钢在锻造过程中的裂纹演化分析

本文对某锻板的异常裂纹进行了分析。裂纹是在锻造过程中发现的。进行了宏观分析、SEM、成分检测、金相分析、夹杂物分析、EPMA和EDS分析。扫描电镜显示，断口的主要特征是解理断裂，据此可以确定断口为脆性断裂。XRF和碳硫分析仪显示板的正常组成状况。EPMA和EDS表明，磷的偏析在裂缝周围广泛分布。结果表明:12Cr13钢在锻造过程中裂纹产生的主要原因是裂纹周围的磷偏析引起的脆性。众所周知，磷元素富集在晶界上，削弱了晶界的结合强度，对钢的韧性有不利影响。当需要良好的塑性和韧性时，应避免其存在，组织应均匀。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case studies in engineering failure analysis

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