力學(xué)性能
( 哈爾濱工業(yè)大學(xué) 現(xiàn)代焊接生產(chǎn)技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，
哈爾濱 150001)
摘 要: 以Ag-Cu-Ni-Li為釬料對(duì)TiAl與40Cr進(jìn)行了高頻感應(yīng)釬焊， 研究了TiAl/40Cr釬焊接頭的界面組織和力學(xué)性能。采用掃描電鏡、 電子探針、 X射線能譜分析儀等分析了界面組織及生成相，測(cè)試了接頭的抗拉強(qiáng)度及界面生成相的顯微硬度。 結(jié)果表明： 釬料與2種母材發(fā)生界面生反應(yīng)成Al3Ti、 Ag［s, s］、 Ti(CuAl)2、 Ti2Ni和TiC等多種反應(yīng)相， 接頭界面結(jié)構(gòu)Al/A為T(mén)il3Ti/Al3Ti+Ag［s, s］/ Ti(CuAl)2+Ti2Ni+Ag［s, s］/TiC/40Cr。 在實(shí)驗(yàn)所選的工藝參數(shù)范圍內(nèi)， 當(dāng)連接溫度θ=850℃， 保溫時(shí)間t=180s時(shí)， 接頭的抗拉強(qiáng)度達(dá)到265MPa。
關(guān)鍵字: TiAl/40Cr；感應(yīng)釬焊； 顯微組織； 力學(xué)性能
induction brazing TiAl/40Cr joints
（ State Key Laboratory of Advanced Welding Production Technology,
Harbin Institute of Technology, Harbin 150001, China）
Abstract: Induction brazing of TiAl and 40Cr using Ag-Cu-Ni-Li foil as filler metal was investigated. Both interfacial microstructures and mechanical properties of brazed joints were studied, and the influence of brazing temperature was evaluated. The interface structure formation phases of the joints were investigated by scanning electron microscopy, electron probe microanalysis and X-ray diffraction, the tensile strength of joint and the microhardness of the formation phases were tested. The results show that Ag-Cu-Ni-Li has reacted with both of the base metal and Al3Ti, Ag［s, s］, Ti(CuAl)2 and Ti2Ni phases have been produced. The typical interface structure of brazed joints can be expresses as TiAl/Al3Ti/Al3Ti+Ag［s, s］/ Ti(CuAl)2+Ti2Ni+Ag［s, s］/TiC/40Cr. The excellent joint tensile strength obtained is 265MPa when the temperature of joint is 850℃ and time is 180s.
Key words: TiAl/40Cr; induction brazing; microstructures; mechanical properties
