文章信息/Info

Title:

Effect of Heat Treatment Processes on Microstructure and Property of Big-Diameter Titanium Alloy Tube

作者:

李婷; 杜宇; 趙亮; 常江

西北有色金屬研究院

Author(s):

LI Ting; DU Yu; ZHAO Liang; CHANG Jiang

Northwest Institute for Nonferrous Metal Research

關鍵詞:

TC4ELI管材; 力學性能; 沖擊韌性; 斷裂韌性; 金相組織

Keywords:

TC4ELI tube;  mechanical property;  impact toughness;  fracture toughness;  metallograph

DOI:

10.7502/j.issn.1674-3962.2017.10.10

文獻標志碼:

A

摘要:

采用4種熱處理制度對TC4ELI鈦合金大直徑管材試樣進行處理，研究不同熱處理制度對其組織與性能的影響。結果表明：經750 ℃×1 h/AC普通退火處理后，組織為魏氏組織，具有較高的沖擊韌性和斷裂韌性，強度較低；經900 ℃×1 h/AC處理后，組織為晶界模糊的魏氏組織，同樣具有較高的沖擊韌性和斷裂韌性，且強度較普通退火有所上升；經930 ℃×1 h/WQ+580 ℃×6 h/AC處理后，組織為魏氏組織，α片層較為細小，其斷裂韌性（96��8 MPa·m1/2）、強度（892 MPa）、斷面收縮率（42%）以及伸長率（16��0%）達到4種處理制度下的最大值，但沖擊韌性急劇下降；經930 ℃×1 h/WQ+650 ℃×6 h/AC處理后，組織為魏氏組織，晶內α相片層取向呈編織狀，具有較高的強度和斷裂韌性，沖擊韌性較差。

Abstract:

Four kinds of heat treatment processes were used to study the effect on the microstructure and properties of the TC4ELI big-diameter titanium alloy tubes. The results show that after the processing of 750 ℃×1 h/AC,the widmanstatten structure is acquired,the impact toughness and fracture toughness are much higher,but the tensile strength is the lowest; after the processing of 900 ℃×1 h/AC,the widmanstatten structure with fuzzy grain boundary is obtained,the impact toughness and fracture toughness are as high as that of the previous processing,and the tensile strength is increased; after the processing of 930 ℃×1 h/WQ+580 ℃×6 h/AC,the widmanstatten structure with very fine α lamellas is obtained,the fracture toughness(96��8 MPa·m1/2),tensile strength(892 MPa),reduction in area(42%) and elongation(16��0%) are the highest among the properties after four kinds of heat treatment processes,while the impact toughness is decreased seriously; after the processing of 930 ℃×1 h/WQ+650 ℃×6 h/AC,the widmanstatten structure with α phase lamellas interwovened is acquired,the tensile strength and fracture toughness are also higher,but the impact toughness is the lowest value.