2相?？拷缚p的熱影響區(qū)內(nèi)的層狀γ晶具有明顯的流線特征，其方向與焊接界面熱塑性金屬的流動方向一致。接頭的顯微硬度從母材區(qū)到焊縫區(qū)呈逐漸增加的趨勢，焊縫區(qū)顯微硬度相較于母材區(qū)增加了約1700 MPa；接頭的室溫抗拉強(qiáng)度與母材相當(dāng)，在683 MPa到717 MPa之間。焊縫區(qū)的細(xì)晶強(qiáng)化效應(yīng)是接頭強(qiáng)度較高的主要原因。"/>

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在線去應(yīng)力退火對線性摩擦焊TiAl合金接頭微結(jié)構(gòu)與力學(xué)性能的影響機(jī)制
作者:
作者單位:

1.西北工業(yè)大學(xué) 民航學(xué)院，陜西 西安 710072;2.西北工業(yè)大學(xué) 材料學(xué)院 陜西省摩擦焊接工程技術(shù)重點(diǎn)實(shí)驗(yàn)室 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室，陜西 西安 710072

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中圖分類號:

基金項(xiàng)目:

國家自然科學(xué)基金項(xiàng)目面上項(xiàng)目；陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃重點(diǎn)項(xiàng)目


Microstructure Evolution and Mechanical Properties of Linear Friction Welded TiAl Alloy Joint with Online Stress Relieving
Author:
Affiliation:

1.School of Civil Aviation, Northwestern Polytechnical University, Xi'an 710072, China;2.State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi 'an 710072, China

Fund Project:

National Natural Science Foundation of China (51675435); Natural Science Fund to Basic Research in Key Areas of Shaanxi Province (2018JZ5004)

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    摘要:

    采用在線去應(yīng)力退火工藝對線性摩擦焊TiAl合金接頭進(jìn)行處理，避免了焊后裂紋的產(chǎn)生。顯微組織分析表明，接頭焊縫區(qū)與熱力影響區(qū)界限明顯，焊縫區(qū)主要由等軸γ晶組成，并含有少量的α2相。靠近焊縫的熱影響區(qū)內(nèi)的層狀γ晶具有明顯的流線特征，其方向與焊接界面熱塑性金屬的流動方向一致。接頭的顯微硬度從母材區(qū)到焊縫區(qū)呈逐漸增加的趨勢，焊縫區(qū)顯微硬度相較于母材區(qū)增加了約1700 MPa；接頭的室溫抗拉強(qiáng)度與母材相當(dāng)，在683 MPa到717 MPa之間。焊縫區(qū)的細(xì)晶強(qiáng)化效應(yīng)是接頭強(qiáng)度較高的主要原因。

    Abstract:

    Crack-free TiAl joints were welded by linear friction welding with online stress relieving process. Microstructural examination demonstrates that the joint has a clearly identified weld zone which consists mainly of equiaxed γ grains with a few α2 phase. Lamellar grains in thermo-mechanically affected zones near the weld margin are oriented along with the flow direction of the plasticized material. The microhardness of the joint presents a global increase from the base metal to the weld interface by about 1700 MPa; the tensile strength of the joints ranges from 683 MPa to 717 MPa at ambient temperature, which is comparable to that of the base metal. The refinement strengthening contributes to enhancing the joint strength.

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引用本文

陳曦,張釗,謝發(fā)勤,馬鐵軍,李文亞,吳向清.在線去應(yīng)力退火對線性摩擦焊TiAl合金接頭微結(jié)構(gòu)與力學(xué)性能的影響機(jī)制[J].稀有金屬材料與工程,2021,50(8):2765~2770.[Chen Xi, Zhang Zhao, Xie Faqin, Ma Tiejun, Li Wenya, Wu Xiangqing. Microstructure Evolution and Mechanical Properties of Linear Friction Welded TiAl Alloy Joint with Online Stress Relieving[J]. Rare Metal Materials and Engineering,2021,50(8):2765~2770.]
DOI：10.12442/j. issn.1002-185X.20200436

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  • 收稿日期:2020-06-23
  • 最后修改日期:2020-07-17
  • 錄用日期:2020-07-21
  • 在線發(fā)布日期: 2021-09-07
  • 出版日期: 2021-08-31