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Solution and aging behavior of precipitates in laser melting deposited V-5Cr-5Ti alloys

激光熔化沉积 V-5Cr-5Ti 合金第二相的固溶和时效行为

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Abstract

V-5Cr-5Ti alloys have been fabricated using a laser melting deposition (LMD) additive manufacturing process, showing precipitates aggregated near the grain/dendrite boundaries. Since the mechanical properties of vanadium alloys considerably depend on the precipitates, solution and aging treatments have been applied to eliminating the aggregations of the precipitates. The results show that as the solution temperature increases from 800 to 1560 °C, the densities and the lengths of the precipitates are reduced, while the widths of the precipitates are increased. When the solution temperature reaches 1560 °C, most impurity elements diffuse into the matrix and form into a nearly uniform supersaturated solid solution. Aging treatments have been applied to the 1560 °C solution treated samples. It shows that as the aging temperature increases from 800 to 1200 °C, the precipitate length increases, and the shapes of precipitates change from near-spherical to lath-like. Compared to 800 and 1200 °C, aging at 1000 °C results in the highest precipitate density. Compared to the LMD and solution-treated samples, the aged samples have the highest micro-hardness, due to the precipitation strengthening.

摘要

使用激光熔化沉积(LMD)技术制备的 V-5Cr-5Ti 合金中存在大量偏析分布在晶界/枝晶界的第二相。由于钒合金基体无法通过热处理进行相变强化,其力学性能主要取决于第二相,因此十分有必要研究如何采用固溶和时效热处理来消除LMD 钒合金中的第二相偏析。研究结果表明,随着固溶温度从 800 °C 升至 1560 °C,LMD 钒合金中的第二相的长度和密度减小而其宽度增加。当固溶温度达到 1560 °C,大部分杂质元素可扩散进基体中并形成近乎均匀分布的过饱和固溶体。对 1560 °C 固溶样品进行时效处理,结果表明,随着时效温度从 800 °C 升至 1200 °C,第二相的长度增加,且第二相的形状由近球形逐渐向条状转变。与 800 °C 和 1200 °C 相比,1000 °C 时效处理形成的第二相密度最高。由于存在第二相的析出强化效果,与LMD 样品和固溶状态样品相比,时效样品具有最高的硬度。

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Authors and Affiliations

  1. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621908, China

    Peng-tao Chai  (柴鹏涛), Ye Wang  (王烨), Yu-zhao Zhou  (周昱昭), Xiao-shan Yang  (杨晓珊), Jin-feng Li  (李晋锋), Xue Liu  (刘学), Guo-min Le  (乐国敏) & Guo-zong Yue  (岳国宗)

  2. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China

    Xue-fei Huang  (黄雪飞)

  3. Shanghai Hangyi Research Institute of High-tech Development, Shanghai, 200082, China

    Peng-tao Chai  (柴鹏涛)

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Contributions

The overarching research goals were developed by LE Guo-min, HUANG Xue-fei, and YUE Guo-zong. CHAI Peng-tao, WANG Ye, and ZHOU Yu-zhao provided the measured data, and analyzed the measured data. YANG Xiao-shan, LI Jin-feng, and LIU Xue analyzed the calculated results. The initial draft of the manuscript was written by CHAI Peng-tao. LE Guo-min, HUANG Xue-fei, and YUE Guo-zong edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.

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Correspondence to Guo-zong Yue  (岳国宗).

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Conflict of interest

CHAI Peng-tao, WANG Ye, ZHOU Yu-zhao, YANG Xiao-shan, LI Jin-feng, LIU Xue, LE Guo-min, HUANG Xue-fei, and YUE Guo-zong declare that they have no conflict of interest.

Foundation item: Project(51871203) supported by the National Natural Science Foundation of China; Project(TZ2018006-0303-02) supported by the Science Challenge Project, China; Projects(2020ZDZX0017, 2019YFG0217) supported by the Sichuan Science and Technology Program, China

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Chai, Pt., Wang, Y., Zhou, Yz. et al. Solution and aging behavior of precipitates in laser melting deposited V-5Cr-5Ti alloys. J. Cent. South Univ. 28, 1089–1099 (2021). https://doi.org/10.1007/s11771-021-4682-1

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