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兩種典型熱處理對(duì)BT25Y合金電子束焊接組織和力學(xué)性能的影響
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西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,西部超導(dǎo)材料科技股份有限公司,西部超導(dǎo)材料科技股份有限公司

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陜西省自然科學(xué)(2014JM6222)


Effect of Two Typical Heat Treatments on Microstructure and Mechanical Property of Electron Beam Weldment of BT25Y
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Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Titanium Alloy Research Center,Northwest Institute for Nonferrous Metal Research,Xi’an Shannxi,Western Superconducting Technologies Co,Ltd,Xi’an,Western Superconducting Technologies Co,Ltd,Xi’an

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    摘要:

    對(duì)BT25Y合金電子束焊接樣品進(jìn)行700℃/2h AC的退火處理和940℃/2h AC+600℃/8h AC的固溶+時(shí)效處理工藝,研究?jī)煞N熱處理工藝對(duì)合金焊接區(qū)域的組織和力學(xué)性能影響。研究結(jié)果表明,無(wú)熱處理情況下,焊縫溶合區(qū)主要由α′馬氏體構(gòu)成,焊縫區(qū)硬度和強(qiáng)度明顯高于基體。700℃/2h AC退火處理后,焊縫區(qū)的α′馬氏體轉(zhuǎn)變?yōu)榧?xì)小彌散的α相,焊縫區(qū)的硬度和強(qiáng)度高于基體,室溫拉伸斷裂發(fā)生基體,焊接樣品具有較差的高溫持久性能。940℃/2h AC+600℃/8h AC的固溶+時(shí)效處理,焊縫熔合區(qū)的α′馬氏體轉(zhuǎn)變?yōu)槌叽巛^大的片層α相,并且沿原始凝固β晶界存在尺寸較大的連續(xù)或斷續(xù)棒狀α析出帶,該析出帶使得焊接樣品在室溫拉伸時(shí)沿焊縫發(fā)生脆性沿晶斷裂,該熱處理后合金具有較好的高溫持久性能。

    Abstract:

    The microstructures and mechanical properties of electron beam weldment BT25Y after 700℃/2h AC (AT) and 940℃/2h AC+600℃/8h AC (SAT) were investigated. The results indicated that the fusion zone microstructure of non heat treatment (NHT) specimen is mainly composed of α′ martensite phase and which show high microhardness and strengthen in comparison to base metal zone (BZ). For the specimens after AT, the α′ martensite in FZ transformed to fine α phase which shows similar microhardness regular pattern in comparison to NHT specimen. The fracture generated in BZ because of lower hardness and strengthens of BZ in comparison to FZ. Under this condition the specimen shows bad high temperature lasting strength. For the specimens after SAT, the α′ martensite in FZ transformed to α phase with rather big size and there is continuous or interrupted big size α precipitation bands along the original β grain boundaries. These precipitation bands in FZ lead to the brittle fracture of welded specimen and the fracture generated in FZ. Under this condition the specimen shows better high temperature lasting strength.

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辛社偉,趙永慶,周偉,李倩,洪權(quán),毛小南,葛鵬,王凱旋,雷錦文.兩種典型熱處理對(duì)BT25Y合金電子束焊接組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2017,46(11):3422~3427.[Xin Shewei, Zhao Yongqing, Zhou Wei, Li Qian, Hong Quan, Mao Xiaonan, Ge Peng, Wang Kaixuan, Lei Jinwen. Effect of Two Typical Heat Treatments on Microstructure and Mechanical Property of Electron Beam Weldment of BT25Y[J]. Rare Metal Materials and Engineering,2017,46(11):3422~3427.]
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  • 收稿日期:2015-09-02
  • 最后修改日期:2016-05-11
  • 錄用日期:2016-05-18
  • 在線發(fā)布日期: 2017-12-13
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