Ti-5Al-3Mo-3Cr-1Zr-0.1Si合金的形变再结晶行为及晶粒尺寸模型  

Deformation recrystallization behavior and grain size model of Ti-5Al-3Mo-3Cr-1Zr-0.1Si alloy

作　　者：李超 樊凯 朱雪峰 詹孝冬 朱鸿昌 LI Chao;FAN Kai;ZHU Xuefeng;ZHAN Xiaodong;ZHU Hongchang(Hunan Xiangtou Gold Sky Titanium Industry Technology Co.,Ltd.,Changde 415001,China)

机构地区：[1]湖南湘投金天钛业科技股份有限公司,常德415001

出　　处：《粉末冶金材料科学与工程》2024年第5期411-422,共12页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点研发计划资助项目(2023YFB3712400);国家自然科学基金资助项目(52371040);湖南省自然科学基金区域联合基金资助项目(2023JJ50333)。

摘　　要：本文对Ti-5Al-3Mo-3Cr-1Zr-0.1Si合金进行两相区变形和单相区退火,研究变形温度、变形程度以及变形-退火衔接方式对合金静态再结晶行为的影响,并建立变形温度和退火后β晶粒尺寸的相关性模型。结果表明:低变形温度有利于细化β再结晶晶粒。这归因于低变形温度下,α相含量增加,增大了β基体的变形储能,促进了β相的再结晶形核。退火后Ti-5Al-3Mo-3Cr-1Zr-0.1Si合金β相的平均晶粒尺寸随变形程度增大而减小,当变形程度超过40%后,β晶粒平均尺寸逐渐趋于稳定,约为136μm。变形后的冷却速率也会影响合金退火后的晶粒尺寸,冷速越快,β晶粒尺寸越大。当合金在预变形后不经冷却直接升温至单相区进行退火时,β晶粒得到均匀细化。In this paper,Ti-5Al-3Mo-3Cr-1Zr-0.1Si alloy was deformed in two-phase zone and annealed in single-phase zone to study the effects of deformation temperature,degree of deformation,and deformation-annealing articulation on the static recrystallisation behaviour of the alloy,and established a model for the correlation between the deformation temperature and theβgrain size after annealing.The results show that the low deformation temperature is conducive to theβgrain refinement.This is attributed to the increase ofαphase content at low deformation temperature,which in turn increases the deformation distortion energy ofβmatrix and promotes the recrystallized nucleation ofβphase.The average grain size of the alloy after annealing decreases with the increase of deformation degree.When the deformation degree exceeds 40%,theβgrain average size gradually tends to stabilize,about 136μm.The cooling rate after the deformation also affects the grain size after annealing,and the faster the cooling rate is,the larger theβgrain size is.When the alloy is heated directly to the single-phase zone for annealing without cooling after pre-deformation,theβgrains are uniformly refined.

关 键 词：钛合金 形变热处理 再结晶 β晶粒均匀细化 晶粒尺寸模型 

分 类 号：TG146.2[一般工业技术—材料科学与工程]