本文研究了 GH37合金经连续 CO_2激光束辐照及补充热处理后的显微组织特点,和激光局部熔凝以及施加不同的后续热处理对热作用区显微硬度、700℃下的旋转弯曲疲劳、800℃下的拉伸及持久等力学性能的影响.结果表明,该合金经激光熔凝后,必须重新调整热作用区的组织状态使晶界碳化物晶内γ′相合适析出,以及尽量减少熔区枝晶间的元素偏析和消除辐照后的残余热应力等,才能使力学性能恢复到满意的指标。试验表明,适于本合金特点的处理工艺为:预热辐照,1050℃,4h,空冷;800℃,16h,空冷.
Study was made of the microstructure of alloy GH37 subjected continuously to CO_2 laser beam and followed with various heat treatments.The influence of laser radiating local fusion-solidification and subsequent heat treatment on its microhardness over heat-affected zone,rotating bending fatigue at 700℃ as well as tensile and rupture strength at 800℃ has been discussed.For such alloy GH37 after fusion-solodification,a further treatment to readjust the microstructure of the heat-affected zone is essential for properly precipitating the γ'-phase in car- bide along grain boundary,possibly reducing the element segregation in dendrite over fusion zone and eliminating the thermal residual stress,etc.,hence,its high temperature mechanical properties,e.g.,rupture,tensile and fatigue strength, would be done to satisfaction.The suitable regime of heat treatment may be: preheating and laser radiating+1050℃,4h,A.C.+800℃,16h,A.C.
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