采用非接触式红外高温测试仪对连续/脉冲激光成形两种模式下激光再制造FeCrNiCu合金成形层温度场进行分析,获取了熔池及热影响区温度场分布的一般规律,验证了脉冲激光工艺在控制热输入和成形形变以及降低熔池及热影响区温度方面的工艺优越性.结果表明:脉冲激光成形热影响区峰值温度为730.4～810.5℃,熔池峰值温度为998.7～1383.4℃,明显低于相同工艺下连续输出模式;脉冲激光成形层具有更快的升温及降温速率,利于形成细晶组织和获得良好的力学性能;实际成形实验也进一步验证脉冲激光工艺具有更小的热影响区范围.
The temperature field of FeCrNiCu alloy forming layers of continuous wave(CW) and pulsed laser remanufacture was analyzed using the non-contact infrared thermometer.The general rule of temperature field distribution of molten pool and heat-affected zone of the two modes was obtained.The pulsed laser process superiority in heat input,forming deformation control and reducing the temperature in molten pool and heat-affected zone was vilidated.The results show that during pulsed laser forming the peak temperature in the heat-affected zone is 730.4-810.5℃,the peak temperature in the molten pool is 998.7-1383.4℃,which are all obviously lower than the same process of the CW mode;the temperature-rise rate and cooling rate of pulsed laser are higher,which is helpful to the forming of fine grain structures and good mechanical performance;the forming experiment also further verifies more narrow heat-affected zone in pulsed laser process.
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