本文選題：激光成形修復(fù) + 激光增材制造　； 參考：《金屬學(xué)報(bào)》2017年03期

【摘要】：采用激光立體成形技術(shù)進(jìn)行了300M鋼修復(fù)實(shí)驗(yàn),利用XRD、SEM及動(dòng)態(tài)散斑等手段研究了激光成形修復(fù)300M鋼沉積態(tài)和熱處理態(tài)的組織及力學(xué)性能特征。結(jié)果表明,300M鋼基材區(qū)由馬氏體、貝氏體及少量殘余奧氏體組成;修復(fù)區(qū)由頂部的貝氏體組織,中部的馬氏體和貝氏體的混合組織,到底部的回火馬氏體組織呈現(xiàn)連續(xù)轉(zhuǎn)變;熱影響區(qū)則呈現(xiàn)為不均勻的馬氏體組織。經(jīng)過(guò)淬火+回火處理后,各區(qū)域的組織變得均勻,均為回火馬氏體和貝氏體的混合組織。修復(fù)后沉積態(tài)試樣的拉伸性能遠(yuǎn)低于鍛件標(biāo)準(zhǔn)。但經(jīng)過(guò)熱處理后,修復(fù)試樣的各項(xiàng)力學(xué)性能指標(biāo)均有顯著提高。應(yīng)力-應(yīng)變測(cè)試結(jié)果表明,沉積態(tài)和熱處理態(tài)試樣在彈性變形階段的應(yīng)變都是均勻增加的,而超過(guò)最大拉伸強(qiáng)度后,局部應(yīng)變?cè)谛迯?fù)區(qū)急劇增加。這與試樣的組織協(xié)調(diào)變形能力及應(yīng)變硬化指數(shù)有關(guān)。
[Abstract]:The repair experiments of 300M steel were carried out by using laser stereoscopic forming technology. The microstructure and mechanical properties of 300M steel repaired by laser forming were studied by means of XRDX SEM and dynamic speckle. The results show that the base area of the steel is composed of martensite, bainite and a small amount of retained austenite, and the repair zone is transformed continuously from the bainite structure at the top, the mixed structure of martensite and bainite from the middle to the tempering martensite at the bottom. The heat affected zone presents inhomogeneous martensite structure. After quenching and tempering, the microstructure of each region becomes uniform, all of them are mixed microstructure of tempered martensite and bainite. The tensile properties of the deposited specimens are much lower than the forging standard. However, after heat treatment, the mechanical properties of the repaired samples were improved significantly. The results of stress-strain test show that the strain of both deposited and heat treated specimens increases uniformly during elastic deformation, but when the maximum tensile strength exceeds the maximum tensile strength, the local strain increases sharply in the repair zone. This is related to the deformation capacity and strain hardening index of the specimen.
【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;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目Nos.51323008、51475380和51501154 高等學(xué)校學(xué)科創(chuàng)新引智計(jì)劃項(xiàng)目No.08040~~
【分類號(hào)】：TG142.1

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