氢对TA10合金焊接接头组织和性能的影响
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摘要
针对钨极氩弧焊焊接10 mm厚TA10钛合金板的焊接接头在渗氢量为0.14%与未渗氢两种情况下的显微组织和力学性能的差异进行分析。结果表明:与原始接头相比,经过固溶渗氢的接头组织中晶粒之间的晶界已分辨不清;接头组织中分布着大量条状或点状氢化物;两种焊接接头显微硬度分布曲线都呈"W"形变化,焊核中心区硬度最高,热影响区硬度最低,渗氢接头的显微硬度略比原始态接头高;与原始态接头相比,渗氢后接头的抗拉强度提高6.1%,而塑性降低66.7%,原始接头断裂模式为韧性断裂,渗氢接头为脆性断裂。
The microstructure and mechanical properties of welded joints of 10 mm thick TA10 titanium alloy plate welded by tungsten argon arc welding were analyzed under two conditions of hydrogen permeation amount of 0.14% and no hydrogen permeation. The results show that compared with the original joint,the grain boundaries in the joint microstructure after solution of hydrogen permeation can not be distinguished. A large number of strip or punctate hydride are distributed in the joint. The microhardness distribution curves for two kinds of welding joint show"W"shape,the hardness in the center of the weld zone is highest,the hardness of heat affected zone is lowest,and the microhardness of joint after hydrogen permeation is slightly lower than that of the original state joint. Compared with the original state of joints,the tensile strength of the joints after hydrogen permeation increases by 6.1%,and the plasticity reduces by 66.7%. The fracture mode of original joint is ductile fracture,while the fracture mode of joint after hydrogen permeation is brittle fracture.
The microstructure and mechanical properties of welded joints of 10 mm thick TA10 titanium alloy plate welded by tungsten argon arc welding were analyzed under two conditions of hydrogen permeation amount of 0.14% and no hydrogen permeation. The results show that compared with the original joint,the grain boundaries in the joint microstructure after solution of hydrogen permeation can not be distinguished. A large number of strip or punctate hydride are distributed in the joint. The microhardness distribution curves for two kinds of welding joint show"W"shape,the hardness in the center of the weld zone is highest,the hardness of heat affected zone is lowest,and the microhardness of joint after hydrogen permeation is slightly lower than that of the original state joint. Compared with the original state of joints,the tensile strength of the joints after hydrogen permeation increases by 6.1%,and the plasticity reduces by 66.7%. The fracture mode of original joint is ductile fracture,while the fracture mode of joint after hydrogen permeation is brittle fracture.
引文
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[3]GURRAPPA I.Characterization of titanium alloy Ti-6Al-4V for chemical,marine and industrial applications[J].Materials Characterization,2003,51(2):131-139.
[4]董宝明,郭德伦,张田仓.钛合金焊接结构在先进飞机中的应用及发展[J].航空材料学报,2003(S1):239-243.
[5]李佐臣.国外Ti-0.3Mo-0.8Ni合金的研究、生产与应用[J].稀有金属材料与工程,1984(5):75-81.
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[7]李佐臣,吴清枝.耐蚀Ti-0.3Mo-0.8Ni合金的研制[J].稀有金属材料与工程,1992(1):37-45.
[8]余存烨.钛制化工设备腐蚀氢脆的质疑与探讨[J].化工设备与管道,2010,47(2):53-60.
[9]杨长江,梁成浩,王华.钛及其合金氢脆研究现状与应用[J].腐蚀科学与防护技术,2006,18(2):122-125.
[10]余存烨.石化设备金属材料氢脆的探讨[J].全面腐蚀控制,2015(5):17-22.
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[12]曹兴民,奚正平,赵永庆.TC21合金高温渗氢组织变化研究[J].热加工工艺,2005(1):29-33.
[13]依里因A A,马莫诺夫A M.铸造钛合金的热氢处理[J].材料工程,1992(1):14-16.
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