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低高溫雙重?zé)崽幚韺す膺x區(qū)熔化TC4鈦合金斷裂韌性影響
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作者單位:

1.沈陽理工大學(xué);2.中國科學(xué)院金屬研究所

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中圖分類號:

TG146.23

基金項目:

中國航發(fā)集團產(chǎn)學(xué)研合作項目(HFZL2019CXY019)


Effect of low and heigh double heat treatment on fracture toughness of TC4 titanium alloy fabricated by selective laser melting
Author:
Affiliation:

1.Shenyang Ligong University;2.Institute of Metal Research,Chinese Academy of Sciences,Shenyang ,China

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    摘要:

    研究了低高溫雙重?zé)崽幚韺す膺x區(qū)熔化(Selective Laser Melting，SLM)成形TC4鈦合金組織特征及斷裂韌性的影響規(guī)律。結(jié)果表明：低溫退火成形態(tài)合金橫截面顯微組織表現(xiàn)為大量針狀馬氏體α′相和β相，縱截面表現(xiàn)為沿成形方向生長的柱狀晶，晶內(nèi)針狀馬氏體α′相板條與成形方向的夾角成45o左右。熱處理后，針狀α′相轉(zhuǎn)變?yōu)榘鍡lα相，形成α+β的板條組織。隨著熱處理溫度的升高，α片層逐漸粗化，裂紋擴展路徑曲折程度增加，斷裂韌性由成形態(tài)的43.1 MPa?m1/2，逐漸提高至109 MPa?m1/2。

    Abstract:

    The effect of different heat treatment temperatures on microstructure and fracture toughness of TC4 titanium alloy fabricated by Selective Laser Melting (SLM) was studied. The results show that the microstructure is characterized by a large number of acicular martensite α" phase and β phase. The longitudinal section is characterized by columnar crystals growing along the forming direction. The angle between the acicular martensite α" phase and the forming direction is about 45o. After heat treatment, the acicular α "phase is transformed into lamellar α phase, forming α+β lath structure. With the increase of heat treatment temperature, the α lamellar coarsened gradually, the zigzags of crack propagation path increased, and the fracture toughness gradually increased from 43.1 MPa?m1/2 to 109 MPa?m1/2。.

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李玉海,左柏強,蔡雨升,姜沐池,任德春,吉海賓,雷家峰.低高溫雙重?zé)崽幚韺す膺x區(qū)熔化TC4鈦合金斷裂韌性影響[J].稀有金屬材料與工程,2022,51(5):1864~1872.[Li Yuhai, Zuo Baiqiang, Cai Yusheng, Jiang Muchi, Ren Dechun, Ji Haibin, Lei Jiafeng. Effect of low and heigh double heat treatment on fracture toughness of TC4 titanium alloy fabricated by selective laser melting[J]. Rare Metal Materials and Engineering,2022,51(5):1864~1872.]
DOI：10.12442/j. issn.1002-185X.20210430

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  • 收稿日期:2021-05-14
  • 最后修改日期:2021-06-04
  • 錄用日期:2021-06-22
  • 在線發(fā)布日期: 2022-06-09
  • 出版日期: 2022-05-30