【摘要】：采用基于脈沖等離子弧的增材制造技術(shù)在Q235基板上加工了Inconel 718合金試樣,通過改變功率和焊接速度研究了不同熱輸入對試樣組織與性能演變規(guī)律的影響。借助光學(xué)顯微鏡、掃描電鏡、能譜分析、維氏硬度儀等手段對試樣晶粒形態(tài)、枝晶間距、元素偏析、析出相成分及分布、顯微硬度等進(jìn)行表征,結(jié)果表明隨著熱輸入從1.08×106 J/m增大至1.76×106 J/m,晶粒形態(tài)從細(xì)長的柱狀枝晶逐漸轉(zhuǎn)變?yōu)榇执蟮陌麪钪?枝晶間距從6.34μm增大至9.09μm,Nb、Mo等元素在枝晶間偏析加劇,Laves相由顆粒狀、塊狀逐漸變?yōu)殚L鏈狀,顯微硬度不斷下降。
[Abstract]:Inconel 718 alloy samples were fabricated on Q235 substrate by pulsed plasma arc technology. The effects of different heat input on the microstructure and mechanical properties of the samples were studied by changing power and welding speed. By means of optical microscope, scanning electron microscope, energy spectrum analysis and Vickers hardness instrument, the grain morphology, dendrite spacing, element segregation, precipitated phase composition and distribution, and microhardness of the sample were characterized. The results show that with the increase of thermal input from 1.08 脳 106 J / m to 1.76 脳 10 6 J / m, the grain morphology gradually changes from slender columnar dendrite to coarse cellular dendrite, and the dendrite spacing increases from 6.34 渭 m to 9.09 渭 m, and Nb, increases from 6.34 渭 m to 9.09 渭 m. The segregation of Mo and other elements between the dendrites increased, and the Laves phase changed from granular to massive into long chain, and the microhardness decreased continuously.
【作者單位】： 裝甲兵工程學(xué)院裝備再制造技術(shù)國防科技重點實驗室;
【基金】：國家重點研發(fā)計劃項目(2016YFB1100201)
【分類號】：TG132.3;TG456.2

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