摘要
采用化学成分、金相组织和扫描电镜断口分析及显微硬度测定等手段对连铸辊表面堆焊层开裂部位进行了取样分析。结果表明,堆焊工艺制定不当,热影响区的过热区形成高碳粗大马氏体组织及保留了较大的焊接应力,是导致堆焊层开裂的主要原因。并提出了改进措施和建议。
By means of analysising the chemic component, optical structure and the SEM and measuring the microhardness, the samples with the crack in the hardface layer of continuous caster roller were studied. The results show that, when the hardfacing process is not appropriate, the thick martensite structure with high carbon content will form in the overheat region of heat affected zone,and the high residual stress occurred, which are the primary causes resulting in crack. At last, some improvement steps and advice are put forward.
出处
《热加工工艺》
CSCD
北大核心
2006年第3期70-72,共3页
Hot Working Technology
关键词
连铸辊
堆焊层
裂纹
失效分析
continuous caster roller
hardface layer
crack
fracture analysis
