Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第1期    总第226期    2018年1月

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文章编号:1004-0609(2018)-01-0087-10
锻件组织不均匀性对新型近β钛合金组织与力学性能的影响
陈 强1,王庆娟1,王鼎春2,刘继雄2,李 强1,周 晓1,梁 博1

(1. 西安建筑科技大学 冶金工程学院,西安 710055; 2. 宝钛集团有限公司研究院,宝鸡 721014)

摘 要: 研究一种新型β钛合金在两相区锻造后,边部、1/2R、心部组织的不均匀性对后续热处理组织性能的影响。结果表明:合金经750 ℃固溶后,3个位置组织中的初生α相分布不同,经800 ℃固溶后,β相发生不同程度的再结晶。合金经750 ℃+(510 ℃,8 h)固溶时效后,边部和1/2R处的组织出现 “β斑”现象;合金经800 ℃+ 510 ℃,8 h固溶时效后,1/2R处和心部次生α相的析出存在明显的不均匀性。时效过程中组织的不均匀性导致合金3个位置强度和断裂韧性各不相同。在(750 ℃,0.5 h,AC)+(510 ℃,8 h,AC)固溶时效条件下,合金1/2R处的综合性能实现了高强高韧的良好匹配。

 

关键词: β钛合金;两相区锻造;不均匀性;析出相;高强高韧

Effect of microstructure inhomogeneity of forgings on microstructure and mechanical properties of new near β titanium alloy
CHEN Qiang1, WANG Qing-juan1, WANG Ding-chun2, LIU Ji-xiong2, LI Qiang1, ZHOU Xiao1, LIANG Bo1

1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. Institute of Baoji Titanium Industry Group Co., Ltd., Baoji 721014, China

Abstract:The influence of inhomogeneity of original microstructures including edge, 1/2R and core of a new β titanium alloy via α+β forging process on microstructures and mechanical properties following heat treatments were investigated. The results show that the distribution of primary α phase in three locations was nonuniform after the alloy solution-treated at 750 ℃, and at 800 ℃, different degree of recrystallization occurred within β phase. The alloy solution-treated at 750 ℃ followed by aging at 510 ℃ for 8 h, the microstructure with beta fleck happened in edge and 1/2R. Under the same aging condition, when the solution treatment was taken at 800 ℃, the secondary α phase with obviously uneven distribution precipitates in 1/2R and core. This inhomogeneity of microstructures during aging treatments results in different mechanical properties both of strength and fracture toughness in three locations. The alloys treated at (750 ℃, 0.5 h, AC)+(510 ℃, 8 h, AC) acquires good strength-toughness match, and high strength and high toughness of alloy at the location of 1/2R reaches the well match of high strength and high toughness.

 

Key words: β titanium alloy; forged in two-phase region; inhomogeneity; precipitated phase; high strength and high toughness

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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