純鎳與304不銹鋼激光異種焊接的工藝及其接頭的組織性能
發(fā)布時(shí)間：2018-12-08 17:11
【摘要】：采用高密度Nd:YAG固態(tài)連續(xù)激光器對(duì)N6純鎳和304奧氏體不銹鋼進(jìn)行了焊接工藝實(shí)驗(yàn),探究了激光功率和離焦量對(duì)焊縫成形的影響。對(duì)接頭進(jìn)行了拉伸強(qiáng)度和硬度的測(cè)試,并結(jié)合光學(xué)顯微鏡(OM)、掃描電鏡(SEM)、能譜分析儀(EDS)等手段分析了接頭的微觀組織。結(jié)果表明:N6純鎳一側(cè)熱影響區(qū)晶粒長(zhǎng)大明顯,焊縫區(qū)靠近兩側(cè)熔合線附近為向焊縫中心區(qū)域生長(zhǎng)的柱狀晶,焊縫中心區(qū)域存在細(xì)小的胞晶區(qū)域;N6熱影響區(qū)的顯微硬度最低,焊縫的顯微硬度介于N6鎳母材和304不銹鋼母材之間;接頭拉伸斷裂位置在焊縫區(qū),抗拉強(qiáng)度達(dá)到N6純鎳母材的90%以上,可以滿足實(shí)際情況下的使用要求。拉伸斷口表現(xiàn)為準(zhǔn)解理斷裂。
[Abstract]:The welding process of N6 pure nickel and 304 austenitic stainless steel was studied by high density Nd:YAG solid-state CW laser. The effects of laser power and defocus on weld formation were investigated. The tensile strength and hardness of the joint were tested, and the microstructure of the joint was analyzed by means of optical microscope, (OM), scanning electron microscope, (SEM), energy spectrum analyzer (EDS) and so on. The results show that the grain size of the heat affected zone on the side of N6 pure nickel is obvious. Near the fusion line of both sides there are columnar crystals growing towards the center of the weld and there are small cellular regions in the center of the weld. The microhardness of N6 heat affected zone is the lowest, and the microhardness of weld is between N6 nickel base metal and 304 stainless steel base metal. The tensile fracture position of the joint is in the weld zone, and the tensile strength is more than 90% of that of the N6 pure nickel base metal, which can meet the practical requirements. Tensile fracture shows quasi-cleavage fracture.
【作者單位】： 中國(guó)科學(xué)院力學(xué)研究所;中國(guó)科學(xué)院大學(xué)工程科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(11272317,11502269)
【分類號(hào)】：TG456.7
[Abstract]:The welding process of N6 pure nickel and 304 austenitic stainless steel was studied by high density Nd:YAG solid-state CW laser. The effects of laser power and defocus on weld formation were investigated. The tensile strength and hardness of the joint were tested, and the microstructure of the joint was analyzed by means of optical microscope, (OM), scanning electron microscope, (SEM), energy spectrum analyzer (EDS) and so on. The results show that the grain size of the heat affected zone on the side of N6 pure nickel is obvious. Near the fusion line of both sides there are columnar crystals growing towards the center of the weld and there are small cellular regions in the center of the weld. The microhardness of N6 heat affected zone is the lowest, and the microhardness of weld is between N6 nickel base metal and 304 stainless steel base metal. The tensile fracture position of the joint is in the weld zone, and the tensile strength is more than 90% of that of the N6 pure nickel base metal, which can meet the practical requirements. Tensile fracture shows quasi-cleavage fracture.
【作者單位】： 中國(guó)科學(xué)院力學(xué)研究所;中國(guó)科學(xué)院大學(xué)工程科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(11272317,11502269)
【分類號(hào)】：TG456.7
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