铁素体钢中白点缺陷的检验分析

发布时间：2018-04-27 01:32

本文选题：铁素体钢 + 白点缺陷　；参考：《钢铁》2017年12期

【摘要】：通过金相显微镜、扫描电镜等分析方法对铁素体钢低倍检验后发现的疑似白点缺陷进行了分析判断,发现疑似白点缺陷在金相显微镜下呈锯齿状裂纹,为白点裂纹形貌特征。通过对低倍试样上断口的检验发现,低碳铁素体钢宏观断口处分布有银灰色圆形斑点,为白点缺陷特征,铁素体不锈钢宏观断口无明显白点特征,但铁素体不锈钢的疑似白点显微断口有沿晶断裂和以夹杂物为裂纹源的解理断裂两种,都具有氢脆断口特征,由此判断,两种铁素体钢中缺陷均为白点缺陷。铁素体不锈钢中的白点缺陷与常见白点断口上的浮云状、波纹状、解理羽毛、显微疏松等形貌特征有所不同,而且不同铁素体不锈钢试样上的白点缺陷断口形貌也不同,一处为沿晶断裂,一处为以夹杂物为裂纹源的解理断裂。
[Abstract]:By means of metallographic microscope, scanning electron microscope and other analytical methods, the suspected white spot defects found after low power examination of ferrite steel were analyzed and judged. It was found that the suspected white spot defects were serrated cracks under metallographic microscope, which were the morphology characteristics of white spot cracks. It is found that there are silver gray circular spots on the macroscopic fracture surface of low carbon ferrite steel, which is a white spot defect feature, while the macroscopic fracture surface of ferrite stainless steel has no obvious white spot feature. However, there are two kinds of microfracture in the suspected white spot of ferrite stainless steel, intergranular fracture and cleavage fracture with inclusions as the source of cracks, both of which have the characteristics of hydrogen embrittlement fracture, so it can be concluded that the defects in the two kinds of ferrite steels are white spot defects. The morphology of white spot defects in ferrite stainless steel is different from that on common white spot fracture, such as cloud shape, ripple shape, cleavage feather, micro-loose and so on, and the fracture morphology of white spot defect on different ferrite stainless steel sample is also different. One is intergranular fracture, the other is cleavage fracture with inclusion as crack source.
【作者单位】：山西太钢不锈钢有限公司技术中心;
【分类号】：TG142.15

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