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杜赵新,刘国龙,刘飞,程军,陈艳飞,陈耘,黄东男,刘慧敏.预时效对粗晶β钛合金微观组织和机械性能的影响[J].稀有金属材料与工程(英文),2019,47(3):770~774.[Du Zhaoxin,Liu Guolong,Liu Fei,Cheng Jun,Chen Yanfei,Chen Yun,Huang Dongnan and Liu Huimin.The influence of pre aging on microstructure and mechanical properties of coarse grained β titanium alloy[J].Rare Metal Materials and Engineering,2019,47(3):770~774.]
The influence of pre aging on microstructure and mechanical properties of coarse grained β titanium alloy
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Received:September 21, 2017  Revised:December 03, 2017
DOI:
Key words: β titanium  alloy, Pre  aging, Microstructure, Refinement, Mechanical  properties
Foundation item:国家自然科学基金青年基金(51601099), 内蒙古自然科学基金(2016BS0506), 内蒙古工业大学校基金。(ZD201607),宁波市自然基金(2015A610077),内蒙古自治区科技创新引导项目
Author NameAffiliation
Du Zhaoxin,Liu Guolong,Liu Fei,Cheng Jun,Chen Yanfei,Chen Yun,Huang Dongnan and Liu Huimin  
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Abstract:
      The influence of pre aging heat treatment on microstructure and mechanical properties of coarse grained β titanium alloy has been studied in this paper. The pre aging heat treatment could serve as a precipitation step to provide uniform dispersed precursors for secondary α phase precipitation, and then leads to the dense, finely and homogenous distribution of secondary α phase. Prolonging of the pre aging time results in the finer scale of secondary α phase. The pre aging heat treatment strongly affects the mechanical properties of β titanium alloy. Within a coarse grain condition, the strength tested in this work is about 1340MPa when single aging at 550oC. However, the strength achieves to 1760MPa when pre aging at 350oC before 550oC, which increased by more than 30% compares to single aging. The micro hardness of the alloy also be improved markedly by pre aging. The effect of pre aging time on mechanical properties is that the prolonging of the pre aging time leads to the increase of strength and micro hardness, but the ductility is sacrificed, which is mainly due to the refinement of secondary α phase.