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1Cr18Ni9Ti不銹鋼超窄間隙焊接接頭組織與性能分析
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國家自然科學(xué)基金（51105185）


Microstructure and Mechanical Property of Ultra-narrow-gap Welding Joint of 1Cr18Ni9Ti Stainless Steel
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    摘要:

    采用超細(xì)顆粒焊劑約束電弧超窄間隙焊接方法進(jìn)行了1Cr18Ni9Ti奧氏體不銹鋼的超窄間隙焊接試驗(yàn)，并對所得超窄間隙焊接接頭的組織及性能進(jìn)行了測試和分析。結(jié)果表明，1Cr18Ni9Ti奧氏體不銹鋼超窄間隙焊接接頭的根焊焊縫區(qū)晶粒為等軸晶，而填充焊和蓋面焊的焊縫區(qū)晶粒則為粗大的柱狀晶。等軸晶和柱狀晶的基體均為奧氏體，晶粒內(nèi)部均分布有少量板條狀鐵素體。超窄間隙焊接接頭的填充焊縫和根焊焊縫具有與母材相當(dāng)?shù)挠捕?，而蓋面焊縫的硬度則略低于母材。超窄間隙焊接接頭除了收縮率和沖擊功比母材的略低外，抗拉強(qiáng)度、屈服強(qiáng)度及伸長率明顯高于母材所對應(yīng)性能的最低值。此外，試驗(yàn)還測得超窄間隙焊接接頭的腐蝕速率為0.417 g/(m2·h)，該值明顯低于母材的腐蝕速率

    Abstract:

    Ultra-narrow-gap welding experiment of 1Cr18Ni9Ti austenitic stainless steel has been carried out by the method of constricting arc with ultra-fine granular flux, and microstructures and mechanical property of ultra-narrow-gap welding joint have been measured and analyzed. The results indicate that ultra-narrow-gap welding joint of 1Cr18Ni9Ti austenitic stainless steel takes on equiaxed grains in the backing weld zone and coarse columnar grains in the weld zone of filling bead and cover pass. Equiaxed grain and columnar grain mainly are made of austenite, but there is a small quantity of lath ferrite in the equiaxed grain and columnar grain. Backing weld and filling bead of ultra-narrow-gap welding joint have the similar hardness as base metal, but the hardness of cover pass is lower than that of base metal. The properties of ultra-narrow-gap welding joint are higher than the minimum of corresponding properties of base metal including the tensile strength, yield strength and elongation ratio except reduction of area and impact energy. Besides, corrosion rate of ultra-narrow-gap welding joint is 0.417 g/(m2.h), which is obviously lower than that of base metal

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鄭韶先,杜寶峰,韓 峰,時(shí) 哲.1Cr18Ni9Ti不銹鋼超窄間隙焊接接頭組織與性能分析[J].稀有金屬材料與工程,2015,44(10):2454~2458.[Zheng Shaoxian, Du Baofeng, Han Feng, Shi Zhe. Microstructure and Mechanical Property of Ultra-narrow-gap Welding Joint of 1Cr18Ni9Ti Stainless Steel[J]. Rare Metal Materials and Engineering,2015,44(10):2454~2458.]
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  • 收稿日期:2015-10-10
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  • 在線發(fā)布日期: 2016-07-13
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