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基于預(yù)合金粉末原料的粉床型電子束增材制造W-Ni-Fe-Co合金研究
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1.西北有色金屬研究院 金屬多孔材料國家重點(diǎn)實(shí)驗(yàn)室 西安;2.東北大學(xué)

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科學(xué)挑戰(zhàn)專題資助(項(xiàng)目號(hào)：TZ2018006),國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2016YFB0700301）


Research on W-Ni-Fe-Co alloys fabricated by Selective electron beam melting from pre-alloyed powder
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Norhwest Institute for Nonferrous Metal Research

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    摘要:

    采用等離子旋轉(zhuǎn)霧化方法制備了W-Ni-Fe-Co預(yù)合金粉末,并進(jìn)行了粉床型電子束增材制造成形。結(jié)果表明：W-Ni-Fe-Co預(yù)合金粉末由兩種形貌的顆粒組成,一是球形粉末顆粒,二是由許多小顆粒粘結(jié)而成的不規(guī)則粉末顆粒。預(yù)合金粉末內(nèi)部顯微組織為γ- (Ni-Fe)相內(nèi)部鑲嵌著規(guī)則的W顆粒,γ- (Ni-Fe)相內(nèi)部含有過飽和的W元素。在粉床型電子束增材造成形過程中,W-Ni-Fe-Co合金的顯微組織顯示出一定的遺傳性,但是由于成形過程中細(xì)小的熔池會(huì)同時(shí)受到反沖壓力、熱毛細(xì)管力及馬蘭戈尼對(duì)流的作用,熔池的瞬時(shí)流動(dòng)劇烈,促進(jìn)了鎢顆粒的重排過程,顯微組織更為均勻。成形致密化過程主要為W顆粒的重排,并沒有顯著的W的溶解-析出過程。粉床電子束增材造成形的W-Ni-Fe-Co合金室溫抗拉強(qiáng)度可達(dá)1098MPa,但是合金塑性較差，斷裂方式主要為鎢的穿晶斷裂和周圍γ- (Ni-Fe)相的韌性撕裂

    Abstract:

    W-Ni-Fe-Co pre-alloyed powder was prepared by plasma rotating electrode process, and then fabricated by selective electron beam melting (SEBM). W-Ni-Fe-Co pre-alloy powder consists of spherical powders and irregular powders with the microstructure of tungsten particles coated by γ- (Ni-Fe) phase, which contains supersaturated tungsten. Microstructure of the W-Ni-Fe-Co alloy shows a certain heredity from powder to SEBMed sample. The molten pool will be subjected to recoil pressure, hot capillary force and Marangoni convection during SEBM, the instantaneous flow of the molten pool promoted the rearrangement of tungsten particles, leading a higher uniformity in the SEBM sample than the powder. Densification process during SEBM is mainly the rearrangement of W particles, and there is no significant dissolution-precipitation process of W. The tensile strength of SEBMed W-Ni-Fe-Co alloy was measured to be 1098MPa together with a poor ductility. Fracture mode is brittle transgranular fracture and ductile tearing of γ- (Ni-Fe) bonding phase.

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引用本文

楊廣宇,陳靖海,劉楠,楊坤,賈亮,賈文鵬,王建,湯慧萍.基于預(yù)合金粉末原料的粉床型電子束增材制造W-Ni-Fe-Co合金研究[J].稀有金屬材料與工程,2020,49(11):3865~3869.[Yang Guangyu, Chen Jinghai, Liu Nan, Yang Kun, Jia Liang, Jian Wenpeng, Wang Jian, Tang Huiping. Research on W-Ni-Fe-Co alloys fabricated by Selective electron beam melting from pre-alloyed powder[J]. Rare Metal Materials and Engineering,2020,49(11):3865~3869.]
DOI：10.12442/j. issn.1002-185X.20200235

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  • 收稿日期:2020-04-10
  • 最后修改日期:2020-04-16
  • 錄用日期:2020-04-17
  • 在線發(fā)布日期: 2020-12-09
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