通过对LZ50车轴钢边部增碳缺陷进行金相检验和扫描电镜检验,发现增碳处组织异常,全部为珠光体,伴随大量MnS和硅酸盐夹杂物.现场排查发现在保温帽和铸模之间有较大的缝隙,缝隙中残留有大量粉渣,而且使用的保护渣为高碳型保护渣.由此判断,浇铸过程中钢水与缝隙中的粉渣接触造成钢锭帽口线增碳,而且钢水中未被保护渣完全吸收的夹杂物也被捕捉残留在钢坯表面.
The edge carburization defect of LZ50 axle steel was tested by metallographic and scanning electronic microscope.It was found the structure of carburization area was pearlite, and abundant MnS and silicate inclusions were appeared at carburization area.The greater gap between riser head and ingot was found out by on-site investigation, in which there was large mold power that was high carbon slag.And thus it can be judged that the contact between the mold power and steel caused the edge carburization at riser head line, and also the inclusions which was not absorbed completely by the mold power in steel was captured at the surface of billet.
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