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Microstructure and Properties of Electron Beam Welded Tantalum-to-Stainless Steel Joints
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Microstructure and Properties of Electron Beam Welded Tantalum-to-Stainless Steel Joints
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National Basic Research Program (2010CB731704)

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    摘要:

    研究了鉭與不銹鋼電子束焊接接頭組織、缺陷特征及力學(xué)性能。電子束熱源作用位置影響到接頭成形，偏不銹鋼0.2 mm進(jìn)行焊接接頭成形較好。焊縫為細(xì)小枝晶組織，F(xiàn)e元素含量較高，形成的ε相（Fe2Ta）和μ相(FeTa或Fe7Ta6)為彌散分布。在鉭側(cè)熔合線處ε相和μ相為層狀分布，在焊接應(yīng)力作用下易形成微裂紋缺陷。接頭焊縫區(qū)普遍硬度較高，而鉭側(cè)熔合線處變形協(xié)調(diào)能力較差，存在裂紋源，導(dǎo)致接頭拉伸時(shí)在該處斷裂。接頭抗拉強(qiáng)度不高，僅為255 MPa

    Abstract:

    The microstructure, defect characteristics, and mechanical properties of electron beam welded (EBW) tantalum-to-stainless steel joints were investigated. Joint formation was influenced by the position of the EBW heat source. with a well-formed joint was obtained when the heat source was deviated by 0.2 mm towards the stainless steel. The weld is composed of fine dendrites with high elemental Fe content and homogenously-dispersed ε (Fe2Ta) and μ (FeTa or Fe7Ta6) phases. However, ε and μ phases formed at the tantalum fusion line had lamellar distribution and micro-cracks are easily formed in this region under welding stress. Although the weld zone has high hardness, the poor deformation compatibility of the fusion line at the tantalum side and the existence of crack sources lead to fracturing during the tensile test. The tensile strength of the joints was found to be low, 255 MPa

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陳國(guó)慶,張秉剛,莊 園,鄧冰輝,馮吉才. Microstructure and Properties of Electron Beam Welded Tantalum-to-Stainless Steel Joints[J].稀有金屬材料與工程,2013,42(5):914~918.[Chen Guoqing, Zhang Binggang, Zhuang Yuan, Deng Binghui, Feng Jicai. Microstructure and Properties of Electron Beam Welded Tantalum-to-Stainless Steel Joints[J]. Rare Metal Materials and Engineering,2013,42(5):914~918.]
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  • 收稿日期:2012-06-06
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