【摘要】：采用超聲沖擊工藝對FGH95鎳基高溫合金激光熔覆層進(jìn)行處理.利用金相顯微鏡分析超聲沖擊前后激光熔覆層微觀組織的變化特征,采用圖像分析軟件Image-Pro Plus測量晶粒尺寸,并對超聲沖擊處理前后熔覆層截面的顯微維氏硬度進(jìn)行了對比分析.結(jié)果表明,超聲沖擊處理后熔覆層發(fā)生塑性變形,并沿深度方向晶粒具有不同程度的細(xì)化.強(qiáng)塑性變形區(qū)內(nèi)位錯塞積現(xiàn)象顯著,熔覆層組織形成細(xì)化的小晶塊;次塑性變形區(qū)深度范圍為0.1~0.25 mm,其微觀組織中存在大量細(xì)化的樹狀枝晶;微塑性變形區(qū)內(nèi)等軸晶細(xì)化至5.4μm,細(xì)化深度達(dá)0.7 mm.超聲沖擊處理后熔覆層顯微維氏硬度顯著增大,表面顯微維氏硬度值最大為594.25 HV,相比未經(jīng)沖擊熔覆層提高1.3倍.
[Abstract]:The laser cladding layer of FGH95 nickel-based superalloy was treated by ultrasonic impact technology. The microstructure of laser cladding layer before and after ultrasonic impact was analyzed by metallographic microscope, and the grain size was measured by image analysis software Image-Pro Plus. The microhardness of the cladding section before and after ultrasonic impact treatment was compared and analyzed. The results show that the cladding has plastic deformation and grain refinement along the depth direction after ultrasonic impact treatment. In the strong plastic deformation zone, the dislocation slug accumulation phenomenon is obvious, the microstructure of the cladding layer forms fine small crystal blocks, the depth range of the secondary plastic deformation zone is 0.1? 0. 25 mm, and there are a large number of fine dendritic dendrites in the microstructure. In the microplastic deformation zone, the equiaxed grain is refined to 5.4 渭 m, and the refining depth is 0.7 mm.. After ultrasonic impact treatment, the Vickers hardness of the cladding layer increases significantly, and the maximum Vickers hardness of the surface layer is 594.25 HV, which is 1.3 times higher than that of the unimpacted cladding layer.
【作者單位】： 南京航空航天大學(xué)機(jī)電學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51475238) 航空科學(xué)基金資助項目(2011ZA52007) 中央高�；究蒲袠I(yè)務(wù)費專項資金資助項目(30820122011ZA52007) 南京航空航天大學(xué)研究生創(chuàng)新基地(實驗室)開放基金資助項目(kfjj120216)
【分類號】：TG174.4

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