9Ni鋼超窄間隙光纖激光焊接接頭組織及性能
發(fā)布時間：2018-07-14 17:54
【摘要】：采用YLS-10000光纖激光器和ERNiMo-8焊絲,對液化天然氣船液罐用9Ni鋼進行了超窄間隙激光焊接,研究了接頭組織和性能。結果表明,優(yōu)化焊接參數(shù)可以得到側壁熔合良好的超窄間隙接頭。焊縫組織主要為奧氏體,兩側結晶形態(tài)為柱狀晶,中心為等軸晶。熱影響區(qū)分為明顯的粗晶區(qū)和細晶區(qū),組織均為馬氏體和少量殘余奧氏體,硬度均值約為340HV,遠高于母材均值(230HV)和焊縫均值(200HV)。拉伸試樣均斷于焊縫,接頭抗拉強度略低于母材的。隨著與焊縫中心距離的增大,接頭的低溫沖擊功增大,且均值都在70J以上。斷口形貌均為細小的韌窩,接頭為韌性斷裂。
[Abstract]:Using YLS-10000 fiber laser and ERNiMo-8 welding wire, the ultra-narrow gap laser welding of 9Ni steel for liquefied natural gas tanker was carried out. The microstructure and properties of the joint were studied. The results show that the ultra-narrow gap joint with good side wall fusion can be obtained by optimizing welding parameters. The microstructure of the weld is mainly austenite with columnar crystal on both sides and equiaxed crystal at the center. The thermal effect can be divided into coarse and fine grain regions. The microstructure is martensite and a small amount of retained austenite. The average hardness is about 340 HVV, which is much higher than that of base metal (230 HV) and weld metal (200 HV). The tensile specimens are broken in weld and the tensile strength of the joints is slightly lower than that of the base metal. With the increase of the distance from the weld to the center of the weld, the low temperature impact energy of the joint increases, and the mean value is above 70 J. The fracture morphology is fine dimple and the joint is ductile fracture.
【作者單位】： 上海交通大學上海市激光制造與材料改性重點實驗室;高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心;
【基金】：工業(yè)和信息化部新型液化天然氣船液貨圍護系統(tǒng)預先研究項目
【分類號】：TG456.7
本文編號：2122493
[Abstract]:Using YLS-10000 fiber laser and ERNiMo-8 welding wire, the ultra-narrow gap laser welding of 9Ni steel for liquefied natural gas tanker was carried out. The microstructure and properties of the joint were studied. The results show that the ultra-narrow gap joint with good side wall fusion can be obtained by optimizing welding parameters. The microstructure of the weld is mainly austenite with columnar crystal on both sides and equiaxed crystal at the center. The thermal effect can be divided into coarse and fine grain regions. The microstructure is martensite and a small amount of retained austenite. The average hardness is about 340 HVV, which is much higher than that of base metal (230 HV) and weld metal (200 HV). The tensile specimens are broken in weld and the tensile strength of the joints is slightly lower than that of the base metal. With the increase of the distance from the weld to the center of the weld, the low temperature impact energy of the joint increases, and the mean value is above 70 J. The fracture morphology is fine dimple and the joint is ductile fracture.
【作者單位】： 上海交通大學上海市激光制造與材料改性重點實驗室;高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心;
【基金】：工業(yè)和信息化部新型液化天然氣船液貨圍護系統(tǒng)預先研究項目
【分類號】：TG456.7
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