SAE1215易切削钢探伤不合格原因分析
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摘要
某钢厂在生产SAE1215易切削钢的过程中,出现钢材探伤不合格现象。针对SAE1215易切削钢在探伤过程中出现的不合格问题,通过使用金相显微镜、扫描电子显微镜等观察分析手段,对不合格试样进行了金相分析、扫描电镜分析。结果表明:钢材表面存在裂纹,裂纹呈连续的纺锤状且底部圆滑,有皮下气泡的特征;铸坯存在皮下气泡缺陷是造成SAE1215易切削钢探伤不合格的原因。为避免此类探伤不合格现象的发生,采取了相应措施减少铸坯皮下气泡数量,降低皮下气泡尺寸。
In the process of producing SAE1215 free cutting steel, the flaw detection of steel products is unqualified. For the problem of nonconformity in flaw detection of SAE1215 free cutting steel, the specimens were analyzed by metallographic analysis and SEM analysis. The results show that there are cracks on the steel surface and the cracks are continuous spindle and the bottom is smooth with the characteristics of subcutaneous bubbles. The subcutaneous bubble defect in the casting billet is the reason for the nonconformity in flaw detection of SAE1215 free cutting steel. In order to avoid the occurrence of such unqualified inspections, measures were taken to reduce the number and the size of the subcutaneous bubbles in the billet.
In the process of producing SAE1215 free cutting steel, the flaw detection of steel products is unqualified. For the problem of nonconformity in flaw detection of SAE1215 free cutting steel, the specimens were analyzed by metallographic analysis and SEM analysis. The results show that there are cracks on the steel surface and the cracks are continuous spindle and the bottom is smooth with the characteristics of subcutaneous bubbles. The subcutaneous bubble defect in the casting billet is the reason for the nonconformity in flaw detection of SAE1215 free cutting steel. In order to avoid the occurrence of such unqualified inspections, measures were taken to reduce the number and the size of the subcutaneous bubbles in the billet.
引文
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[3]王小红,谢兵,冯仲渝.国内外易切削钢的现状和研究进展[J].特殊钢, 2005, 26(4):26-28.
[4]蒋光辉,古隆建,施哲,等.易切削钢现状与发展趋势[J].四川冶金, 2016, 28(5):10-14.
[5]陈宣宇,曹建春,周晓龙,等.国内外易切削钢的研究进展及展望[J].热加工工艺, 2016, 45(12):25-28.
[6]姜锡山,赵晗.钢铁显微断口速查手册[M].北京:机械工业出版社, 2010.
[7]徐杰,田海涛,孙学伟,等.冷镦钢盘条线性缺陷分析及控制[J].河南冶金, 2016, 24(4):21-22.
[8]朱玉秀,熊玉彰,曾静,等. 40Cr钢螺栓裂纹原因分析及改进措施[J].武汉工程职业技术学院学报,2009, 21(1):16-18.
[9]李延生.连铸坯缺陷的成因及防止对策[J].炼钢,1998(3):55-58.
[10]耿明山,王新华,张炯明,等.连铸坯表面气孔缺陷研究[J].钢铁, 2010, 45(1):46-50.
[11]肖寄光,王福明.连铸坯中气泡产生原因分析及判断方法[J].宽厚板, 2006, 12(2):32-36.
[12]韩金昊,张炯明,尹延斌.钢中典型气泡理化特征的基础研究[J].炼钢, 2017, 33(5):46-53.