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激光功率對激光熔化沉積Ti-6Al-4V-0.25C合金組織和性能的影響
作者:
作者單位:

哈爾濱工業(yè)大學 材料科學與工程學院

作者簡介:

通訊作者:

中圖分類號:

TG146.23

基金項目:

國家重點研發(fā)計劃“政府間國際科技創(chuàng)新合作重點”專項(項目號2017YFE0123500)


Effect of Laser Powder on the Microstructure and Properties of Ti-6Al-4V-0.25C Alloys by Laser Melting Deposition
Author:
Affiliation:

School of Materials Science and Enineering,Harbin Institute of Technology

Fund Project:

the National Key R&D Project of China (2017YFE0123500)

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    摘要:

    采用含0.25wt.%C的Ti-6Al-4V預(yù)合金粉末進行激光熔化沉積實驗,研究了激光功率對Ti-6Al-4V-0.25C合金組織和性能的影響。結(jié)果表明,Ti-6Al-4V-0.25C合金微觀結(jié)構(gòu)為等軸晶粒形貌,晶粒內(nèi)部形成了層狀α+β結(jié)構(gòu),并且平均晶粒尺寸和α板條尺寸均隨著激光功率的增加而逐漸增加。此外,隨著激光功率的增加,合金拉伸性能得到明顯提升,特別是在激光功率為1500 W時制備的合金樣品,極限抗拉強度和伸長率分別為1191 MPa和8.3%。一方面,這是由于激光功率增加使得合金孔隙率顯著降低；另一方面,Ti-6Al-4V合金中含有微量的C元素,在冷卻/凝固過程中,大多數(shù)的C原子固溶在Ti基體中,造成固溶強化。

    Abstract:

    The effect of laser power on microstructure and properties of Ti-6Al-4V-0.25C alloy was studied by laser melting deposition of Ti-6Al-4V-0.25C prealloy powder containing 0.25wt.%C. The results show that the microstructure of Ti-6Al-4V-0.25C alloy is equiaxed grain morphology, and layered α+β structure is formed inside the grains. The average grain size and α lath size increase gradually with the increase of laser power. In addition, with the increase of laser power, the tensile properties of the alloy are obviously improved, especially the ultimate tensile strength and elongation of the alloy prepared at the laser power of 1500 W are 1191 MPa and 8.3%, respectively. On the one hand, the porosity of the alloy decreases with the increase of laser power. On the other hand, Ti-6Al-4V alloy contains trace element C. During the cooling/solidification process, C atoms are solidly dissolved in Ti matrix, resulting in solid solution strengthening.

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時國浩,王曉鵬,陳玉勇,杜之明.激光功率對激光熔化沉積Ti-6Al-4V-0.25C合金組織和性能的影響[J].稀有金屬材料與工程,2022,51(12):4570~4578.[Shi Guohao, Wang Xiaopeng, Chen Yuyong, Du Zhiming. Effect of Laser Powder on the Microstructure and Properties of Ti-6Al-4V-0.25C Alloys by Laser Melting Deposition[J]. Rare Metal Materials and Engineering,2022,51(12):4570~4578.]
DOI：10.12442/j. issn.1002-185X.20210953

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  • 收稿日期:2021-11-02
  • 最后修改日期:2022-01-28
  • 錄用日期:2022-02-28
  • 在線發(fā)布日期: 2023-01-19
  • 出版日期: 2022-12-30