摘要
以三维瞬态温度场分布模型为基础 ,对激光相变硬化中不同激光功率和扫描速度组合对硬化层分布均匀性的影响进行了理论研究。研究结果表明 ,在一定光束模式下 ,采用高功率快速扫描可得到相对更为均匀的硬化层分布。据此提出了以综合考虑表面不熔、层深和硬化层分布均匀性三方面要求为原则的扫描参数选择方法 ,即以表面不熔和层深条件限定的两条P
Based on the three-dimensions transient temperature distribution model, the paper analyzes the effects of different combination of laser power and scanning velocity on the hardened case's uniformity. The results show that under the specific laser beam model, using high power and rapid scanning velocity can obtain more well-distributed hardened case. So the paper proposes the selection method of the parameters, which is on the basis of comprehensive consideration for three requirements: keeping surface unmelted, obtaining required case depth, and making uniform distribution of hardened case. The optimum laser scanning parameters can be determined from the point of intersection of two curves which are obtained under the conditions of unmelted surface and case depth, respctively.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2003年第3期84-87,共4页
Transactions of Materials and Heat Treatment
基金
上海市重点学科建设基金资助 (沪教委科 [2 0 0 1 ]第71号 )
关键词
激光相变硬化
硬化层
均匀性
扫描参数
匹配
laser transformation hardening
hardened case
uniformity
scanning parameters
optimum combination
