锻压技术

Ni80Cr20合金板坯锻造裂纹成因分析及改进

英文标题：Cause analysis and improvement on the forged crack for Ni80Cr20 alloy plate

作者：范金席顾燕龙胡显军鲍丙辉

分类号：TG142.73

出版年,卷(期):页码：2018,43(11):13-16

摘要：

采用扫描电镜、能谱分析、热模拟单道次压缩试验等分析方法及试验手段，对Ni80Cr20合金锻造板坯表面裂纹的断裂方式、显微组织以及热模拟后的显微组织进行分析，研究了Ni80Cr20合金板坯锻造裂纹的成因，并提出了相应的解决方案。研究结果显示：Ni80Cr20合金板坯表面裂纹断裂方式为脆性沿晶断裂，锻造板坯的微观组织显示晶界布满膜状碳化物；在锻造过程中，温度在980~1050 ℃范围内，锻造板坯晶界处的膜状碳化物依然存在。因此，Ni80Cr20合金晶界处膜状碳化物导致合金晶界脆化，这种碳化物在锻造过程中依然存在，在锻造应力作用下，微裂纹在晶界处出现并扩展，最终形成锻造裂纹。当Ni80Cr20合金中碳含量控制在0.01%以内时，合金晶界处膜状碳化物消失，合金锻造板坯表面无裂纹。

By scanning electron microscope, energy spectrum and a single pass compression test fracture mode, microstructure and the thermal simulated microstructure on the surface crack of forged Ni80Cr20 alloy plate were analyzed, the causes of forging cracks in Ni80Cr20 alloy plate were studied, and the solution was developed. The results show that the fracture mode of the forged crack on the surface crack of forged plate Ni80Cr20 alloy is brittle intergranular fracture, and the microstructure of the forged plate displays that the grain boundary is covered with the pellicular carbide. However, it still exists within the range of 980-1050 ℃ in the process of forging. Therefore, the pellicular carbide at the grain boundary of Ni80Cr20 alloy results in crystal boundary weakening and still exists during the forging process. Furthermore, micro-crack comes into being and develops at the grain boundary under the action of forged stress, and the forged crack is formed at last. Thus, when the carbon content in Ni80Cr20 alloy is limited less than 0.01%， the pellicular carbide at the grain boundary disappears, and the crack on the forged plate does not appear.

基金项目：

张家港科技攻关计划项目(ZKG1614)

范金席（1987-），男，硕士，助理研究员,E-mail：jxhyfan@163.com;通讯作者：胡显军(1975-),男,博士,研究员级高级工程师,E-mail：huxj-iris@shasteel.cn

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