Effect of Annealing Temperature on Microstructure and Mechanical Properties of Large-Diameter Ti6321 Titanium Alloy Seamless Tube

doi:10.12442/j.issn.1002-185X.20230792

Home > Archive>Volume 54, Issue 4, 2025 >1002-1007. DOI:10.12442/j.issn.1002-185X.20230792

Effect of Annealing Temperature on Microstructure and Mechanical Properties of Large-Diameter Ti6321 Titanium Alloy Seamless Tube
DOI:
                        10.12442/j.issn.1002-185X.20230792
                    
Author:
                        Li Chong1,2Li Chong
Luoyang Ship Material Research Institute, Luoyang 471023, China;National and Local Joint Engineering Research Center for Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China
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Shi Hongjie1Shi Hongjie
Luoyang Ship Material Research Institute, Luoyang 471023, China
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Sun Erju1,2Sun Erju
Luoyang Ship Material Research Institute, Luoyang 471023, China;National and Local Joint Engineering Research Center for Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China
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Xu Yali1,2Xu Yali
Luoyang Ship Material Research Institute, Luoyang 471023, China;National and Local Joint Engineering Research Center for Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China
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Xu Lingyu1,2Xu Lingyu
Luoyang Ship Material Research Institute, Luoyang 471023, China;National and Local Joint Engineering Research Center for Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China
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Chen Chunyang1Chen Chunyang
Luoyang Ship Material Research Institute, Luoyang 471023, China
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Sun Xiaoyi1Sun Xiaoyi
Luoyang Ship Material Research Institute, Luoyang 471023, China
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Song Dejun1,2Song Dejun
Luoyang Ship Material Research Institute, Luoyang 471023, China;National and Local Joint Engineering Research Center for Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China
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Affiliation:1.Luoyang Ship Material Research Institute, Luoyang 471023, China;2.National and Local Joint Engineering Research Center for Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China
Clc Number:TG146.23
Fund Project:国家重点研发计划资助项目（项目编号：2022YFB3705605）

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Abstract:

Large-diameter Ti6321 alloy seamless tube with Φ450 mm×20 mm was prepared using forging billet by cross piercing and hot rolling process, and the effect of annealing temperature on microstructure and mechanical properties of seamless tube were investigated. The results show that the microstructure of as-rolled tube is mainly composed of α phase and transformed β phase. Equiaxial structure is obtained after annealing at 940 ℃, duplex structure is obtained after annealing at 970 ℃, and Widmanstatten structure is obtained after annealing at 1020 ℃. With the increase in annealing temperature, the yield strength and tensile strength at room temperature of the tube are gradually decreased. The plasticity of the tube does not change much below the transformation point, but decreases sharply above the transformation point. The impact toughness first increases and then decreases. According to comprehensive analysis, the suitable annealing temperature for the prepared large-diameter Ti6321 alloy seamless tube is about 970 ℃, when the tube has the best impact performance and impact energy is 62 J. The average yield strength, tensile strength, and elongation of the tube after annealing at 970 ℃ are 786 MPa, 878 MPa, and 16.25%, respectively.

Key words:Ti6321 titanium alloy;large-diameter seamless tube;annealing;microstructure;mechanical property

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[Li Chong, Shi Hongjie, Sun Erju, Xu Yali, Xu Lingyu, Chen Chunyang, Sun Xiaoyi, Song Dejun. Effect of Annealing Temperature on Microstructure and Mechanical Properties of Large-Diameter Ti6321 Titanium Alloy Seamless Tube[J]. Rare Metal Materials and Engineering,2025,54(4):1002~1007.]
DOI：10.12442/j. issn.1002-185X.20230792

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Received:December 07,2023
Revised:March 10,2024
Adopted:March 22,2024
Online: April 23,2025
Published: April 21,2025

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