摘要
针对60CrNi型钢轧辊辊颈开裂问题,通过断口宏观与微观形貌观测,结合金相组织分析、力学性能测试及化学成分检测等手段,并基于实际生产工艺,对裂纹成因展开分析研究。结果表明,主要原因为浇注过程中部分发热剂或保温剂混入钢锭冒口区域,导致该部位碳含量异常偏高。在锻造加热阶段,该区域因碳含量超标发生过热或过烧现象,致使材料强度显著降低,在后续热处理应力作用下萌生裂纹及扩展,最终导致轧辊报废。通过强化热加工工艺操作的质量管理体系,同类问题已全面杜绝。
Regarding the cracking issue of the roll neck in 60CrNi steel rolls,an analytical study on the causes of cracks was conducted through macro and micro morphology observation of the fracture,combined with metallographic structure analysis,mechanical property testing,and chemical composition testing,and based on the actual production process.The results show that the main cause is the mixing of part of the heating agent or insulating agent into the riser area of the steel ingot during the casting process,leading to abnormally high carbon content in this part.During the forging heating stage,overheating or overburning occurred in this area due to excessive carbon content,resulting in a significant reduction in material strength.Under the action of heat treatment stress,cracks gradually initiated and propagated,eventually leading to the scrapping of the roll.Through strengthening the quality management system of hot working operations,similar problems have been fully eliminated.
作者
陈太辉
韩钊
缪显文
闫飞飞
张海宝
CHEN Taihui;HAN Zhao;MU Xianwen;YAN Feifei;ZHANG Haibao
出处
《大型铸锻件》
2025年第6期62-66,68,共6页
Heavy Casting and Forging
关键词
型钢轧辊
辊颈裂纹
失效分析
元素超标
预防措施
Section steel roll
roll neck cracking
failure analysis
element overstandard
preventive measures
