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TC4/30CrMnSiNi2A釬焊接頭組織與力學(xué)性能分析
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1.西北工業(yè)大學(xué) 航天學(xué)院;2.西北工業(yè)大學(xué)航天學(xué)院

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Microstructure and mechanical property of TC4/30CrMnSiNi2A dissimilar materials brazed joints
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School of Astronautics, Northwestern Polytechnical University

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    摘要:

    采用Ti-37.5Zr-15Cu-10Ni和 Ag-Cu28兩種釬料分別對(duì)TC4鈦合金/30CrMnSiNi2超高強(qiáng)鋼異種材料進(jìn)行了釬焊,對(duì)釬焊界面組織以及接頭的力學(xué)性能進(jìn)行了分析。結(jié)果表明：Ag基釬料釬焊TC4與30CrMnSiNi2A異種材料時(shí),釬縫界面組織為Ag(s,s)+Ti-Cu系化合物組成；因Ag固溶體的存在,釬縫具有一定的韌性,接頭剪切強(qiáng)度較高,剪切斷口呈現(xiàn)出韌性斷裂特征。Ti基釬料釬焊TC4與30CrMnSiNi2A異種材料時(shí),釬縫界面組織為Ti-Zr固溶體+未完全反應(yīng)凝固釬料,釬縫顯微硬度較高,接頭剪切強(qiáng)度較低,呈現(xiàn)出脆性斷裂特征。Ag基釬料TC4/30CrMnSiNi2A異種材料釬焊接頭力學(xué)性能明顯優(yōu)于Ti基釬料結(jié)果,在釬焊溫度830℃,保溫時(shí)間15min時(shí),剪切強(qiáng)度為125.52MPa。

    Abstract:

    TC4 titanium alloy was brazed to 30CrMnSiNi2A ultra-high strength steel by Ti-37.5Zr-15Cu-10Ni and Ag-Cu28 brazing filler metals respectively. Microstructure and mechanical property of both brazed joints were analyzed comparatively. Results show that Ag-Cu28 brazed interface is composed of Ag(s,s) and intermetallic compounds in Ti-Cu system. Ag-Cu28 brazed joint has relatively high shear strength due to the exisitence of Ag based solid solution and the shear fracture shows the characteristics of ductile fracture. Ti-37.5Zr-15Cu-10Ni brazed interface consists of Ti-Zr solid solution and solidified brazing filler metals, which lead to the low hear strength of brazed joint. The shear fracture of Ti-37.5Zr-15Cu-10Ni brazed joint shows the characteristics of brittle fracture. Compared with Ti-based brazing filler metal, Ag-based brazing filler metal is suitable for brazing TC4 titanium / 30CrMnSiNi2A ultra-high strength steel dissimilar materials. Sound brazed joints with the shear strength of 125.52MPa can be attained at the brazing temperature of 830℃ with the bolding time of 15 min by Ag-Cu28 brazing filler metals.

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岳喜山,謝宗蕻,徐文豪. TC4/30CrMnSiNi2A釬焊接頭組織與力學(xué)性能分析[J].稀有金屬材料與工程,2019,48(9):3035~3040.[Yue Xishan, Xie Zonghong, Xu Wenhao. Microstructure and mechanical property of TC4/30CrMnSiNi2A dissimilar materials brazed joints[J]. Rare Metal Materials and Engineering,2019,48(9):3035~3040.]
DOI：10.12442/j. issn.1002-185X.20180359

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  • 收稿日期:2018-04-10
  • 最后修改日期:2018-05-18
  • 錄用日期:2018-06-15
  • 在線發(fā)布日期: 2019-10-09
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