挤压筒内衬纵向开裂原因分析  

Cause analysis of longitudinal cracking of extrusion cylinder lining

作　　者：王霞 荆志龙 WANG Xia;JING Zhilong(TZ(Tianjin)Binhai Heavy Machinery Co.,Ltd.,Tianjin 300460,China)

机构地区：[1]太重(天津)滨海重型机械有限公司,天津300460

出　　处：《物理测试》2023年第1期25-30,共6页Physics Examination and Testing

摘　　要：挤压筒组件由挤压筒外套与挤压筒内衬两部分组成。此组件投入使用约11个月后,发现在挤压过程中返铝严重,经检查,其内衬有长约1000 mm的裂纹。为确定挤压筒内衬开裂性质及产生原因,进行宏观分析、化学成分检测、电镜断口分析和金相高低倍检验,对其原因进行分析。结果表明:挤压筒内衬纵向裂纹产生的主要原因是材料成分分布不均,偏析严重、强度不足、塑性低、脆性大,内表面淬火裂纹破坏了基体的连续性,无法满足使用要求而疲劳开裂。The extrusion cylinder assembly consists of two parts,including the shell and the inner lining.An extrusion cylinder assembly was in service for about 11 months.The problem of serious aluminizing was observed in the extrusion process.The inspection showed that there was a crack with length of 1000 mm in the inner lining.In order to determine the property and reason of cracking on extrusion cylinder lining,the macroscopic analysis,chemical composition detection,electron microscope fracture analysis and metallographic examination with high and low magnification were performed to analyze the causes.The results showed that the main causes of the longitudinal cracking on the inner lining was the nonuniform distribution of material composition,serious segregation,insufficient strength,low ductility and high friability.The continuity of base material was destroyed by the cracks on inner surface during quenching.The material could no longer meet the use requirement and cracking due to fragility occurred.

关 键 词：偏析 过热 淬火裂纹 疲劳 

分 类 号：TG115[金属学及工艺—物理冶金]