摘要
利用ANSYS对脉冲放电电磁热止裂温度场和应力场进行模拟,然后对电磁热止裂后的16Mn钢试样熔覆Ni45合金粉末的表面温度场瞬时变化进行模拟。结果表明,在8000 V高压脉冲电压下,裂纹尖端的温度可达1500℃以上,裂尖部分熔化,进而使裂尖钝化,脉冲放电后1000 s时构件的温度基本接近室温。脉冲放电瞬间接近裂尖处的残余应力较大,而远离裂尖处的压应力较小。激光熔覆过程中垂直于激光扫描方向存在着一定的温度梯度。
ANSYS finite element soil-ware was adopted to simulate the temperature field and thermal stress field of crack arrest by pulse discharge electromagnetic heat. Then, the transient variation of the surface temperature field of 16Mn steel when 16Mn steel was cladded Ni45 powder after crack arrest by electromagnetic heat was simulated. The results show that the crack tip temperatures could reach above 1500 ~C with the high voltage pulse of 8000 V. The crack tip melts, which makes the crack tip become passivation. The temperature of the sample closes to room temperature when the pulse discharge time is 1000 s. The residual stress of the steel near the crack tip at the moment of pulse discharge is bigger, and the pressure stress far away from the crack tip is smaller. There is a certain temperature gradient perpendicular to laser scanning direction during laser cladding.
出处
《热加工工艺》
CSCD
北大核心
2017年第24期190-194,198,共6页
Hot Working Technology
基金
陕西省重点研发计划(2017-TSCXL-GY-0035)
西安科技大学博士科研启动基金项目(2016QDJ030)
西安科技大学校培育基金(201742)
陕西省教育厅专项科研计划项目(17JK0498)
关键词
电磁热止裂
激光熔覆
温度场
应力场
crack arrest by electromagnetic heat
laser cladding
temperature field
stress field
