离心铸造高碳半钢辊环开裂失效分析

Cracking Failure Analysis of Centrifugal Casting High Carbon Adamite Horizontal Sleeve

通过硬度检测、成分检测、金相检测、装配应力计算并结合实际铸造工艺参数,对首次上机使用时出现径向贯穿型断裂的高碳半钢液平辊环进行了失效分析。结果表明,辊环内层出钢温度过低、内外层浇注间隔时间过短,造成的辊环内层合金含量高、硬度高、脆性变大,过盈装配应力过大,导致辊环内孔形成径向裂纹并快速扩展形成贯穿型断裂。实践验证表明,规范出钢温度和浇注间隔工艺参数,增加辊环内层的硬度、成分检测,可有效避免径向贯穿型断裂的发生。

Through hardness testing, composition testing, metallographic testing, assembly stress calculation and combining with actual casting process parameters, the failure analysis of high carbon adamite horizontal roll ring with radial through fracture when it was first used on the machine was carried out. The results showed that low tapping temperature and short pouring interval time in the inner and outer layers of the roll ring resulted in high alloy content, high hardness and greater brittleness in the inner layer of the roll ring, and excessive interference assembly stress, which led to the radial cracks in the inner hole of the roll ring and rapid propagation to form through fracture. Practice showed that standardizing tapping temperature and pouring interval process parameters and increasing hardness and composition detection of the inner layer of the roll ring can effectively avoid the fracture.