-5以下能獲得較好的綜合力學(xué)性能。退火態(tài)試樣的顯微硬度低于沉積態(tài)且兩者均隨氧含量增加逐漸提高。室溫拉伸斷口的斷裂機(jī)制隨著氧含量增加由韌性斷裂變化為半解理半韌性斷裂。"/>

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成形氣氛中氧含量對(duì)激光沉積TA15鈦合金組織及力學(xué)性能的影響
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沈陽(yáng)航空航天大學(xué) 航空制造工藝數(shù)字化國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室,沈陽(yáng)航空航天大學(xué) 航空制造工藝數(shù)字化國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室,沈陽(yáng)航空航天大學(xué) 航空制造工藝數(shù)字化國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室,沈陽(yáng)航空航天大學(xué) 航空制造工藝數(shù)字化國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室,沈陽(yáng)航空航天大學(xué) 航空制造工藝數(shù)字化國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室,沈陽(yáng)航空航天大學(xué) 航空制造工藝數(shù)字化國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室

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國(guó)家自然科學(xué)(51505301,51305280,51375316)；遼寧省自然科學(xué)(2015020118)


Effects of Oxygen Content in the Argon Shielding Gas on Microstructure and Mechanical Properties of Laser Deposition Manufacturing TA15 titanium alloy
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Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University

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    摘要:

    采用激光沉積制造方法制備了TA15鈦合金厚壁件,通過(guò)光學(xué)顯微鏡(OM)和掃描電子顯微鏡(SEM)對(duì)其顯微組織、斷口及力學(xué)性能進(jìn)行分析,研究成形氣氛中氧含量對(duì)激光沉積TA15鈦合金組織及力學(xué)性能的影響。結(jié)果表明：隨著氣氛中氧含量增加,沉積態(tài)和退火態(tài)試樣的顯微組織均為典型網(wǎng)籃組織無(wú)明顯變化。退火態(tài)試樣的室溫拉伸強(qiáng)度提高而塑性下降,氧含量保持在5×10-5以下能獲得較好的綜合力學(xué)性能。退火態(tài)試樣的顯微硬度低于沉積態(tài)且兩者均隨氧含量增加逐漸提高。室溫拉伸斷口的斷裂機(jī)制隨著氧含量增加由韌性斷裂變化為半解理半韌性斷裂。

    Abstract:

    The TA15 titanium alloy specimens were prepared by laser deposition manufacturing. The effects of oxygen content in the argon shielding gas on microstructure, fracture and mechanical properties of laser deposition manufacturing TA15 titanium alloy have been investigated by optical microstructure (OM) and scanning electron microscopy (SEM). The results show that both as-deposited and annealed specimens microstructure are typically basket-weave microstructure without dramatic changes with the increasing of the oxygen content of the atmosphere. The tensile strength at room temperature of the annealed alloy is gradually on the rise while the ductility is decreasing. By considering both the ductility and strength properties, samples with the oxygen content at 0~5×10-5 have the best comprehensive mechanical properties. Microhardness of the annealed samples is lower than that of the as-deposited, and they are gradually enhancing with the increasing of oxygen content. Room temperature tensile fracture mechanism changes from ductile fracture to semi-cleavage and semi-ductile fracture with the increasing of oxygen content.

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楊光,馮志國(guó),欽蘭云,李長(zhǎng)富,任宇航,王維.成形氣氛中氧含量對(duì)激光沉積TA15鈦合金組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2017,46(6):1650~1655.[Yang Guang, Feng Zhiguo, Qin Lanyun, Li Changfu, Ren Yuhang, Wang Wei. Effects of Oxygen Content in the Argon Shielding Gas on Microstructure and Mechanical Properties of Laser Deposition Manufacturing TA15 titanium alloy[J]. Rare Metal Materials and Engineering,2017,46(6):1650~1655.]
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  • 收稿日期:2016-04-28
  • 最后修改日期:2016-08-17
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2017-11-07
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