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超聲振動(dòng)及熱處理對(duì)激光直接成形IN718高溫合金組織及性能的影響
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西安交通大學(xué)機(jī)械制造系統(tǒng)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室

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國(guó)家自然科學(xué)(51275392)；陜西省科技統(tǒng)籌創(chuàng)新工程計(jì)劃項(xiàng)目(2015KTTSGY03-06)


Effect of Ultrasonic Vibration and Heat Treatment on Microstructure and Mechanical Properties of Laser Direct Forming IN718 Superalloy
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    摘要:

    研究了超聲振動(dòng)及熱處理對(duì)激光直接成形IN718高溫合金微觀組織和拉伸性能的影響規(guī)律。結(jié)果表明：施加超聲振動(dòng)后,與沉積態(tài)相比,微觀組織得到細(xì)化,顯微硬度和拉伸強(qiáng)度得到提高；經(jīng)均勻化+固溶+雙極時(shí)效熱處理后,柱狀枝晶組織轉(zhuǎn)變?yōu)榈容S狀再結(jié)晶組織,Laves相固溶消失,在晶界和晶內(nèi)彌散析出顆粒狀或細(xì)針狀δ相,基體上析出大量γ″和γ′強(qiáng)化相,合金性能得到進(jìn)一步改善,室溫拉伸性能達(dá)到了鍛件的技術(shù)標(biāo)準(zhǔn)Q/3B 548-1996(高強(qiáng))。

    Abstract:

    The effects of ultrasonic vibration and heat treatment on the microstructure and tensile properties of laser direct forming IN718 superalloy were investigated. The results show that microstructural grain size became finer due to the actions and influences of ultrasonic vibration. In addition, the microhardness and tensile strength of the parts fabricated by LDF with ultrasonic vibration were higher compared with that of the ones fabricated by LDF without ultrasonic vibration. With the heat treatment of homogenization, solution and double aging, the columnar dendrites changed to equiaxed grains due to recrystallization. Laves phase dissolved, and there were grainy and acicular δ phase distributing in and along boundaries of the grains. Besides, a large number of strengthening phase γ″ and γ′ separated out on the matrixes. The room-temperature tensile properties of heat treatment samples reached the wrought standard of Q/3B 548-1996.

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王潭,張安峰,梁少端,張驍,嚴(yán)深平,張連重,李滌塵.超聲振動(dòng)及熱處理對(duì)激光直接成形IN718高溫合金組織及性能的影響[J].稀有金屬材料與工程,2018,47(11):3499~3503.[Wang Tan, Zhang Anfeng, Liang Shaoduan, Zhang Xiao, Yan Shenping, Zhang Liangzhong, Li Dichen. Effect of Ultrasonic Vibration and Heat Treatment on Microstructure and Mechanical Properties of Laser Direct Forming IN718 Superalloy[J]. Rare Metal Materials and Engineering,2018,47(11):3499~3503.]
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  • 收稿日期:2017-02-18
  • 最后修改日期:2017-03-31
  • 錄用日期:2017-04-14
  • 在線發(fā)布日期: 2018-12-19
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