摘要
介绍了进口Hardox500预硬化耐磨板材的化学成分、显微组织及力学性能,对比分析了激光切割、等离子切割、火焰切割三种切割方式对20 mm厚板材硬度的影响以及激光切割对预硬化耐磨板材组织的影响。结果表明:激光切割、等离子切割和火焰切割热影响区范围分别为距切口0~2.0、0~8.0、0~20.0 mm,切割时回火软化导致热影响区板材硬度明显下降;激光切割和等离子切割时切口处板材再次淬火,且淬火冷却速率大于原板材,同时高速的激光束、离子流使切口处板材表面产生残余应力,两种因素共同作用致使切口处硬度明显高于原板材,而火焰切割时切口处硬度低于原板材。
The chemical composition,microstructure and mechanical properties of imported pre-hardened wear resistant steel plate Hardox 500 were introduced.The effects of laser cutting,plasma cutting and flame cutting on the hardness of 20 mm thick plate and the effect of laser cutting on the microstructure of pre-hardened wear resistant plate were compared and analyzed.The results show that the heat affected zone of laser cutting,plasma cutting and flame cutting is 0~2.0,0~8.0 and 0~20.0 mm away from the notch respectively.Tempering softening during cutting leads to the obvious decrease of plate hardness in the heat affected zone.During laser cutting and plasma cutting,the plate at the notch is quenched again,and the quenching cooling rate is greater than that of the original plate.At the same time,the high speed laser beam and ion flow produce residual stress on the surface of the plate at the notch.The joint action of the two factors causes the hardness of the plate at the notch to be significantly higher than that of the original plate,while the hardness of the notch is lower than that of the original plate during flame cutting.
作者
罗德昭
LUO Dezhao(CRCC High-Tech Equipment Corporation Limited,Kunming 650215,China)
出处
《铁道建筑》
北大核心
2022年第5期156-159,共4页
Railway Engineering
关键词
耐磨材料
热切割
试验研究
预硬化耐磨钢板
激光切割
等离子切割
Hardox500
wear resistant material
thermal cutting
experimental study
pre-hardened wear resistant steel plate
laser cutting
plasma cutting
Hardox 500
