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钛合金焊缝组织循环热处理及球化过程分析
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作者单位:

1.中国科学院沈阳自动化研究所;2.中航工业沈阳飞机工业(集团)有限公司

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中图分类号:

TG131

基金项目:

国家基金委-辽宁省联合基金(项目号U1608259);国家自然科学基金(项目号51501219)


The Cyclic Heat Treatment and Analysis on Spheroidizing Mechanism of Titanium Alloy Welding Microstructure
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Affiliation:

Shenyang Institute of Automation Chinese Academy of Science

Fund Project:

NSFC-Liaoning Province united foundation(No. U1608259);National Natural Science Foundation of China(No.51501219);

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    摘要:

    本文针对钛合金焊缝组织不均匀、脆性大、塑性差等问题,提出一种针对焊接接头的新型热处理工艺:α+β与α两相区循环热处理,讨论了不同热处理工艺对组织形貌的影响情况, 得到由具有一定比例的等轴α相、条状α相及β转变相组织,提高循环次数球化的α相增多,长径比明显减小,有明显的球状的α相,其长径比普遍小于3,除此之外在球化的α相周围分布着取向各有不同的细小条状α相。经过四次循环热处理的焊接接头拉伸得到强塑积达到14441.17 MPa?%,焊接接头的塑性有所提高。结合EBSD、TEM等测试结果的分析,解释了该现象产生的原因,解释针状α相的断裂及条状α相的长大,在热处理过程中位错、孪晶的移动形成的亚晶界及β相的分解促进了热蚀坑的形成过程。

    Abstract:

    Considering the problem of coarse microstructure and awful mirco-orientation distribution of TC4 titanium alloy welded-joint with high friability and low plasticity, we designed the post welding cyclic heat treatment between α+β and β-tansus temperature, and discussed the effect of different heat treatment process on the tissue morphology. The equiaxial alpha phase and lamellar alpha and transformed beta phase composition of the tri-modal microstructure was obtained. The study found that improving the cyclic times, occurrence of alpha phase could increase, and the ratio of length to diameter decreased.However, after five cycles some crystal orientation to meet the lamellar related to α Burger orientation relationship of abnormal growth, lammelar alpha rest staggered phase well-distributed, whereas equiaxed alpha phase is not conducive to improve the mechanical properties. When the clcyic times inceased, the more spherificated α phase appeared, and the length to diameter ratio reduced significantly, generally was less than 3. In addition, there were different kinds of small bars α phase around spherificated α phase. After four cyclic heat treatment, the product of strength and elongation of welded joint achieved 14441.17 MPa?%. The mechanical tests result showed that, after four times of cyclic heat treatment the plasticity of welded joint fracture are at maximum, compact size uniform dimples, have obvious ductile fracture characteristics. Almost at the same time, the yield strength and significantly increased, combined with analysis of EBSD, TEM test results, explain the causes of the phenomenon, and a detailed description of the changes in circulation process and spheroidizing mechanism.

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陆莹,乔红超,曲楠,赵吉宾.钛合金焊缝组织循环热处理及球化过程分析[J].稀有金属材料与工程,2019,48(1):254~262.[LuYing, Qiao hongchao, qunan, Zhao jibin. The Cyclic Heat Treatment and Analysis on Spheroidizing Mechanism of Titanium Alloy Welding Microstructure[J]. Rare Metal Materials and Engineering,2019,48(1):254~262.]
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历史
  • 收稿日期:2017-05-04
  • 最后修改日期:2017-07-17
  • 录用日期:2017-08-18
  • 在线发布日期: 2019-02-18
  • 出版日期: