研究了SCM440钢的开裂敏感性与轧后冷却过程中的温度、脱碳程度的关系。结果表明,轧后冷却过程中SCM440大盘条在表层以下30μm以内的区域产生的微裂纹引起了冷镦开裂。在轧后冷却过程SCM440盘卷表面发生脱碳。微裂纹主要在750～800℃范围内产生,由于在这个温度范围内SCM440钢处于两相区,发生了铁素体相变,在表层形成铁素体全脱碳层,最后由于组织应力形成了沿铁素体晶界扩展的微裂纹。
Effects of decarburization and temperature in the cooling process after rolling on cracking sensitivity of SCM440 steel were studied.The results show that the micro-cracks occurred in surface layer less than 30 μm of the SCM440 steel coil caused the cold heading cracking.Surface decarburization of SCM440 steel coils occurs in the cooling process after rolling,and micro-cracks were formed mainly at 750-800℃.In this temperature range,ferrite forms in the fully decarburized layer on surface of SCM440 steel.As a result of microstructure stress,the micro-cracks are generated along ferrite grain boundaries finally.
参考文献
| [1] | 帅习元,陈洪伟,周勇,魏路敏.冷镦钢冷镦开裂原因及其改进措施[J].中国冶金,2008(04):33-38. |
| [2] | 宋强.12.9级内六角螺栓镦头支撑面放射状细裂纹原因分析[J].机械工业标准化与质量,2010(02):35-37. |
| [3] | 崔娟,刘雅政,黄学启.中碳弹簧钢加热过程脱碳特性的试验研究[J].热加工工艺,2007(20):20-23. |
| [4] | 卢胜军,陈亮,孙理,王淼,赵东记.弹簧钢盘条脱碳研究[J].金属制品,2009(02):26-28. |
| [5] | 肖金福,刘雅政,张朝磊,姜超.弹簧钢55SiCrA脱碳规律的研究[J].金属热处理,2010(12):94-98. |
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