本文選題：激光修復(fù) + 鈦合金　； 參考：《稀有金屬材料與工程》2017年07期

【摘要】：以低氧TC4粉末為熔覆材料,采用激光修復(fù)技術(shù)制備了TC4鈦合金面修復(fù)試樣,對(duì)比研究了鍛件和修復(fù)試樣(沉積態(tài))的顯微組織和力學(xué)性能。結(jié)果顯示:修復(fù)試樣的組織宏觀上分為鍛件基材區(qū)、熱影響區(qū)和激光沉積區(qū),3個(gè)區(qū)域中熱影響區(qū)的顯微硬度最高,沉積區(qū)和鍛件基材的顯微硬度相當(dāng)。鍛件試樣的強(qiáng)度及塑性均略高于修復(fù)試樣,同時(shí)發(fā)現(xiàn)40%修復(fù)試樣(即拉伸試樣承受載荷部位橫截面上沉積區(qū)所占的面積分?jǐn)?shù)為40%)的強(qiáng)度略低于50%修復(fù)試樣,塑性則高于后者。表明采用低氧TC4粉末為熔覆材料時(shí),有利于修復(fù)試樣沉積區(qū)和基材區(qū)強(qiáng)度和塑性的匹配,從而提高修復(fù)試樣的綜合性能。對(duì)拉伸斷口進(jìn)行掃描電鏡觀察發(fā)現(xiàn),鍛件試樣拉伸失效后斷口呈現(xiàn)出典型的韌性斷裂特征,而修復(fù)試樣的斷口則表現(xiàn)復(fù)雜,從沉積區(qū)到鍛件基材區(qū)呈現(xiàn)出解理臺(tái)階到韌窩的連續(xù)變化特征,同時(shí)斷口形貌與顯微組織呈現(xiàn)出很好的對(duì)應(yīng)關(guān)系。
[Abstract]:Using low oxygen TC4 powder as cladding material, the surface repair specimens of TC4 titanium alloy were prepared by laser repair technique. The microstructure and mechanical properties of the forged and repaired samples (deposited) were compared.The results show that the microstructure of the repaired specimen can be divided into three parts: forging base area, heat affected zone and laser deposition zone. The microhardness of the heat affected zone is the highest, and the microhardness of the deposition area is the same as that of the forging substrate.The strength and plasticity of the forgings are slightly higher than those of the repaired specimens, and it is found that the strength of 40% of the repaired specimens (i.e. the area fraction of the deposition area on the cross section of the tensile specimens subjected to load is 40%) is slightly lower than 50% of the repaired specimens, and the plasticity is higher than the latter.The results show that using low oxygen TC4 powder as cladding material can improve the comprehensive properties of the repaired samples by improving the strength and plasticity matching between the deposition zone and the substrate zone.Scanning electron microscopy (SEM) observation of tensile fracture shows that the fracture surface of forgings shows typical ductile fracture characteristics after tensile failure, but the fracture surface of repaired specimen is complex.The continuous variation of cleavage step to dimple was observed from the deposition area to the base material area of forgings. At the same time, the fracture morphology showed a good corresponding relationship with the microstructure.
【作者單位】： 西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;西安航空發(fā)動(dòng)機(jī)(集團(tuán))有限公司;
【基金】：National Natural Science Foundation of China(51475380) Research Fund of the State Key Laboratory of Solidification Processing(NWPU),China(99-QP-2014)
【分類號(hào)】：TG146.23;TG665
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本文編號(hào)：1752677