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熱連軋Ti-Al-Nb-Zr-Mo系鈦合金無縫管電子束焊組織和力學性能
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1.天津大學 材料科學與工程學院，天津 300072;2.天津市現(xiàn)代連接技術重點實驗室，天津 300072

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天津市科技計劃項目


Microstructure and Mechanical Properties of Hot Continuous Rolling Ti-Al-Nb-Zr-Mo Titanium Alloy Seamless Tube Welded by EBW
Author:
Affiliation:

1.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2.Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China

Fund Project:

Tianjin Science and Technology Plan Project, China (18ZXJMTG00140)

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    摘要:

    采用真空電子束焊接工藝對熱連軋成型的8 mm厚新型Ti-Al-Nb-Zr-Mo系鈦合金無縫管進行了環(huán)縫焊接試驗，并對焊接接頭的微觀組織和力學性能進行了測試分析。結果表明，該無縫管母材基體主要由初生α相、β轉變組織和魏氏組織組成；焊接接頭的熔合區(qū)由針狀馬氏體α′相、塊狀α相和魏氏組織組成，針狀馬氏體α′的尺寸從上至下逐漸減??；熱影響區(qū)由初生α相和針狀馬氏體α′相組成。焊接接頭顯微硬度平均值大小依次為：熔合區(qū)>熱影響區(qū)>母材，熱影響區(qū)的顯微硬度從近熔合區(qū)側到近母材側逐漸降低。焊接接頭抗拉強度約為893 MPa， 斷裂均發(fā)生在母材基體上，拉伸試樣斷后伸長率可達10%。熔合區(qū)的沖擊功約可以達到母材的80%，彎曲試樣彎曲角度可以達到180°并且無裂紋產(chǎn)生。

    Abstract:

    Electron beam welding (EBW) was applied to an 8-mm-thick new type Ti-Al-Nb-Zr-Mo titanium alloy seamless tube produced by hot continuous rolling. The microstructure and mechanical properties of welded joint were investigated. Results show that the base metal (BM) consists of primary α, transformed β and Widmanstatten structure. For the EBW joint, the fusion zone (FZ) consists of acicular α′, block α and Widmanstatten structure, and the size of acicular α′ decreases gradually from top to bottom of the FZ. Moreover, only primary α and acicular α′ form in the heat affected zone (HAZ). The average microhardness in welded joint is ranked as follows: FZ＞HAZ＞BM, and the microhardness of the HAZ decreases gradually from the FZ to the BM side. The joint's tensile strength is 893 MPa and the fracture occurs at the base metal. The elongation of tensile specimens can reach 10%. The impact energy of FZ reaches ~80% of that of BM and the bending specimens are bended to 180° without cracks.

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呂雪巖,武少杰,周曉鋒,樊立民,馮靖,程方杰.熱連軋Ti-Al-Nb-Zr-Mo系鈦合金無縫管電子束焊組織和力學性能[J].稀有金屬材料與工程,2022,51(12):4376~4384.[Lv Xueyan, Wu Shaojie, Zhou Xiaofeng, Fan Limin, Feng Jing, Cheng Fangjie. Microstructure and Mechanical Properties of Hot Continuous Rolling Ti-Al-Nb-Zr-Mo Titanium Alloy Seamless Tube Welded by EBW[J]. Rare Metal Materials and Engineering,2022,51(12):4376~4384.]
DOI：10.12442/j. issn.1002-185X.20220001

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  • 收稿日期:2022-01-03
  • 最后修改日期:2022-11-24
  • 錄用日期:2022-03-28
  • 在線發(fā)布日期: 2023-01-11
  • 出版日期: 2022-12-30