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應變速率對TC18鈦合金厚板電子束焊接接頭組織和力學性能的影響
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西北工業(yè)大學,西北工業(yè)大學,西北工業(yè)大學

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中圖分類號:

TG442

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陜西省重點科技創(chuàng)新團隊


Effect of strain rate on microstructure and mechanical properties of TC18 thick plate by electron beam welding
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Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Friction Welding Technologies,Northwestern Polytechnical University,Xi’an,Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Friction Welding Technologies,Northwestern Polytechnical University,Xi’an,Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Friction Welding Technologies,Northwestern Polytechnical University,Xi’an

Fund Project:

Key areas of innovation team in Shaanxi Province (No. 2014KCT-12)

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    摘要:

    研究了在優(yōu)化后的焊接工藝參數(shù)下, TC18鈦合金厚板電子束焊接接頭沿板厚方向(上層、中層、下層)應變速率對顯微組織、拉伸性能和應變硬化行為的影響。結(jié)果表明：焊接后焊縫微觀結(jié)構(gòu)發(fā)生了明顯變化,熔合區(qū)顯微組織由粗大的β相和次生α相組成。與母材相比,沿厚度方向的焊接接頭表現(xiàn)出較低的強度和塑性,但其硬化能力增強。焊縫下層的強度和延伸率高于中層和上層。當應變速率為1×10-2 s-1時,焊縫的最大屈服強度和極限拉伸強度達到母材的83％。隨著應變速率的增加,焊縫的硬化能力下降。拉伸斷裂發(fā)生在焊縫區(qū),上層的斷裂過程為解理斷裂,中下層為準解理斷裂。

    Abstract:

    The influence of strain rate of Microstructures, tensile properties and strain hardening behavior of the electron beam welded joint for TC18 titanium alloy under optimized welding parameters were investigated with three slices (top, middle and bottom). The results showed that the welding led to significant microstructural changes across the joint. The microstructure of fusion zone is composed of coarsened β phase and secondary α-phase. Compared with the base metal, the joint slices along the thickness exhibited a lower strength and plasticity but a further higher hardening capacity. The strength and ductility of the bottom slices are higher than those of the middle and top slices. The maximum yield strength and ultimate tensile strength of the welding slices reached the base metal 83% at the strain rate of 1×10-2 s-1. The hardening capacity of welding slices decreased with increasing strain rate. It was significantly enhanced at the middle and bottom slices than the top slice. Tensile fracture occurred in the weld zone.The fracture process of the top slice is cleavage fracture. However, the middle and bottom slices are quasi-cleavage crack.

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韓文,傅莉,陳海燕.應變速率對TC18鈦合金厚板電子束焊接接頭組織和力學性能的影響[J].稀有金屬材料與工程,2018,47(7):2005~2010.[Han Wen, Fu Li, Chen Haiyan. Effect of strain rate on microstructure and mechanical properties of TC18 thick plate by electron beam welding[J]. Rare Metal Materials and Engineering,2018,47(7):2005~2010.]
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  • 收稿日期:2017-11-28
  • 最后修改日期:2018-03-22
  • 錄用日期:2018-04-02
  • 在線發(fā)布日期: 2018-10-10
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