【摘要】：采用Nd:YAG脈沖激光焊機(jī)對CuCoCrFeNi高熵合金薄板進(jìn)行焊接,使用激光共聚焦顯微鏡、掃描電鏡等分析了接頭的微觀組織、化學(xué)成分和裂紋形成原因,并對接頭的顯微硬度進(jìn)行了測試。結(jié)果表明,在脈沖激光焊接作用下,焊縫中心出現(xiàn)貫穿性裂紋和分叉裂紋,熔合線處出現(xiàn)液化裂紋。通過改變焊接工藝參數(shù),采取雙面焊及預(yù)熱等措施都無法避免裂紋的產(chǎn)生。焊縫組織由胞狀晶和等軸晶組成,晶粒與母材相比明顯細(xì)化。在斷裂位置處Cu元素含量約為其他元素含量的3倍,表明斷裂與晶界處含Cu固溶體的富集程度有關(guān)。熔合線附近的硬度和母材硬度相當(dāng),均低于焊縫中心區(qū)硬度。
[Abstract]:The Nd:YAG pulsed laser welding machine was used to weld the CuCoCrFeNi high entropy alloy sheet. The microstructure, chemical composition and crack formation of the joint were analyzed by laser confocal microscope and scanning electron microscope. The microhardness of the joint was tested. The results show that the penetration crack and bifurcation crack appear in the center of the weld under the action of pulsed laser welding, and the liquefaction crack occurs at the fusion line. By changing the welding process parameters and taking measures such as double side welding and preheating, cracks can not be avoided. The microstructure of the weld is composed of cellular crystal and equiaxed crystal, and the grain size is finer than that of the base metal. The content of Cu element at the fault location is about 3 times of that of other elements, indicating that the fault is related to the enrichment of Cu solid solution at grain boundary. The hardness near the fusion line is similar to that of the base metal and is lower than that in the center of weld.
【作者單位】： 沈陽理工大學(xué)材料科學(xué)與工程學(xué)院;中科院沈陽金屬研究所;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃) 資助項(xiàng)目(2011CB610405)
【分類號】：TG456.7

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本文編號：2423485