摘要
研究了激光相变硬化工艺对４５钢亚晶块大小的影响，试验指出，激光功率对亚晶块大小有显著影响，扫描速度的影响不显著，指出亚晶块细化是激光硬化的机制之一。
The influcncc of transformation hardcning by lascr on subgrain size has bbccn studied. The experiments indicate that power of lascr havc marked influcnce. It showed that the subgrain refined hard-ening is the other mechanism of transformation hardening by laser.
