3。在最佳LED窗口內(nèi),在不同N2濃度(3 vol.%、10 vol.%、30 vol.%)工作氣氛中,以氣–液反應(yīng)方式SLM制備了TiN為增強(qiáng)相的Ti6Al4V基復(fù)合材料。該新工藝制備復(fù)合材料的原理為：鈦合金高溫熔池附近的N2裂解為N原子/離子,N與熔融狀態(tài)的Ti原位反應(yīng)生成均勻分散的TiN增強(qiáng)相,并與熔化–凝固過程中的Ti合金基體復(fù)合,最終以SLM逐層成形的方式制備出TiN增強(qiáng)鈦基復(fù)合材料。本文探究了N2濃度對(duì)鈦基復(fù)合材料組織結(jié)構(gòu)和力學(xué)性能的影響規(guī)律。其中,3 vol.%的N2工作氣氛中SLM成形的復(fù)合材料的強(qiáng)度和塑性同時(shí)得到提升,闡述了其強(qiáng)韌化機(jī)理。"/>

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氣–液反應(yīng)激光原位增材制造TiN增強(qiáng)鈦基復(fù)合材料組織結(jié)構(gòu)及力學(xué)性能研究
作者:
作者單位:

1.湘潭大學(xué) 物理與光電工程學(xué)院;2.中國科學(xué)院重慶綠色智能技術(shù)研究院 智能增材制造技術(shù)與系統(tǒng)重慶市重點(diǎn)實(shí)驗(yàn)室

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中圖分類號(hào):

146.23

基金項(xiàng)目:

國家自然科學(xué)基金資助(項(xiàng)目號(hào)51901220)；重慶市自然科學(xué)基金面上項(xiàng)目(項(xiàng)目號(hào)cstc2021jcyj-msxmX0435)


Microstructure and mechanical properties of in-situ laser additive manufacturing of TiN reinforced Ti6Al4V matrix composites based on gas–liquid reaction
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Affiliation:

1.Chongqing Key Laboratory of Additive Manufacturing Technology and Systems,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences;2.School of Physics and Optoelectronics,Xiangtan University

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    摘要:

    本文采用選區(qū)激光熔化(SLM)工藝制備了Ti6Al4V合金,并系統(tǒng)研究了激光能量密度(LED)對(duì)其致密度、顯微硬度、壓縮強(qiáng)度和塑性的影響。獲得了SLM制備Ti6Al4V合金的最佳LED工藝窗口為84.8–163.6 J/mm3。在最佳LED窗口內(nèi),在不同N2濃度(3 vol.%、10 vol.%、30 vol.%)工作氣氛中,以氣–液反應(yīng)方式SLM制備了TiN為增強(qiáng)相的Ti6Al4V基復(fù)合材料。該新工藝制備復(fù)合材料的原理為：鈦合金高溫熔池附近的N2裂解為N原子/離子,N與熔融狀態(tài)的Ti原位反應(yīng)生成均勻分散的TiN增強(qiáng)相,并與熔化–凝固過程中的Ti合金基體復(fù)合,最終以SLM逐層成形的方式制備出TiN增強(qiáng)鈦基復(fù)合材料。本文探究了N2濃度對(duì)鈦基復(fù)合材料組織結(jié)構(gòu)和力學(xué)性能的影響規(guī)律。其中,3 vol.%的N2工作氣氛中SLM成形的復(fù)合材料的強(qiáng)度和塑性同時(shí)得到提升,闡述了其強(qiáng)韌化機(jī)理。

    Abstract:

    In this study, the Ti6Al4V alloys were fabricated by selective laser melting (SLM) technology. The effect of laser energy density (LED) on the relative density, micorhardness, compression strength and plasticity of the Ti6Al4V alloys was systematically studied. The optimum LED processing window for SLM of Ti6Al4V alloys was in the range of 84.8–163.6 J/mm3. In the optimum LED window, the TiN reinforced Ti6Al4V matrix composites were fabricated by SLM in different N2 concentration (3 vol.%, 10 vol.% and 30 vol.%) atmospheres based on gas–liquid reaction. The principle of the novel technology for fabricating of the composites is as follows: decomposition of N2 near the Ti6Al4V melt pool generates N atoms/ions, the gaseous N atoms/ions react with liquid Ti atoms to in-situ synthesize uniformly distributed TiN reinforcements which combine with the Ti6Al4V matrix during melting–solidification, finally, the TiN reinforced Ti6Al4V matrix composites are built by SLM layer-by-layer. Effect of N2 concentration on the microstructure and mechanical properties of the Ti6Al4V matrix composites was researched. The composite fabricated by SLM in 3 vol.% N2 atmosphere exhibited a good combination of high strength and high plasticity. The strengthening and toughening mechanisms were studied.

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朱磊,吳文杰,范樹遷,張凱旺,魏文猴.氣–液反應(yīng)激光原位增材制造TiN增強(qiáng)鈦基復(fù)合材料組織結(jié)構(gòu)及力學(xué)性能研究[J].稀有金屬材料與工程,2022,51(6):2151~2160.[Zhu Lei, Wu Wenjie, Fan Shuqian, Zhang Kaiwang, Wei Wenhou. Microstructure and mechanical properties of in-situ laser additive manufacturing of TiN reinforced Ti6Al4V matrix composites based on gas–liquid reaction[J]. Rare Metal Materials and Engineering,2022,51(6):2151~2160.]
DOI：10.12442/j. issn.1002-185X.20211001

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  • 收稿日期:2021-11-15
  • 最后修改日期:2022-01-22
  • 錄用日期:2022-02-09
  • 在線發(fā)布日期: 2022-07-06
  • 出版日期: 2022-06-29