论文部分内容阅读
用500W的CO_2激光束扫描两种常用材料45钢及T10A钢,功率密度为1.3-1.5×10~4w/cm~2,在8-18mm/秒的扫描速度下可得0.2-0.4mm的硬化层。表面硬度可达HV800以上,分析表明这是组织细化及亚结构因素所致。硬化层的分层情况受多种因素影响,原始状态越不均匀分层越多、激光相变硬化层具有某些微观特征,比如超细的奥氏体晶粒、45钢中出现不同碳浓度的马氏体区以及狭窄的过渡层等,均是急速相变的直接结果。
Two commonly used materials, 45 steel and T10A steel, were scanned with a 500 W CO 2 laser beam with a power density of 1.3-1.5 × 10 -4 w / cm 2 and a 0.2-0.4 mm hardening at a scan speed of 8-18 mm / sec Floor. Surface hardness up to HV800 above, analysis shows that this is due to the organization of thin and sub-structural factors. The delamination of the hardened layer is affected by a number of factors. The more uneven the original state is, the more the laser phase-hardened layer has certain microscopic features, such as ultrafine austenite grains, different carbon concentrations in 45 steel Martensite region and a narrow transition layer, are the direct result of rapid phase change.