保温时间对TiAl基合金组织与力学性能的影响  

Effect of Holding Time on Microstructure and Mechanical Properties of TiAl Based Alloy

作　　者：张润晨 陈庆军[1] 高霁雯 崔霞[1] 徐勇[1] 冯艾寒[2] 曲寿江[2] Zhang Runchen;Chen Qingjun;Gao Jiwen;Cui Xia;Xu Yong;Feng Aihan;Qu Shoujiang(School of Materials Science and Engineering,School of Civil Architecture,Nanchang Hangkong University,Nanchang 330063,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute(LSMRI),Qingdao 266237,China)

机构地区：[1]南昌航空大学材料科学与工程学院土木建筑学院,江西南昌330063 [2]同济大学材料科学与工程学院,上海201804 [3]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266237

出　　处：《稀有金属材料与工程》2020年第9期3189-3194,共6页Rare Metal Materials and Engineering

基　　金：海洋腐蚀与防护重点实验室开放研究基金(KF190413)。

摘　　要：以铸造TiAl合金为研究对象,系统研究了在1523 K下不同保温时间内的合金中β2相的相变规律和其对室温力学性能的影响,结果表明:在1523 K分别保温5 min^4 h,然后对铸造态Ti-Al-Nb-Cr-Mo-B合金进行水冷淬火,当保温时间为2 h时,韧性没有降低,强度却从1200 MPa提升到了1500 MPa。在保温过程中α分解为γ+β相,随后冷却过程中,无序的β相会转变为有序的β2相。实验结果表明β2相是一种硬脆相,少量的β2相能促进合金强度的提升。The transformation rule ofβ2-phase and its effect on the mechanical properties at room temperature in the cast TiAl alloy were studied.The results show that the toughness of the cast Ti-Al-Nb-Cr-Mo-B alloy is not decreased when the holding time is 2 h,but the strength is increased from 1200 MPa to 1500 MPa.In the process of heat preservation,a decomposes intoγ+βphase,and then in the process of cooling,the disorderedβphase transforms into orderedβ2 phase.It is demonstrated thatβ2 phase is a hard brittle phase,and a small amount ofβ2 phase can promote the strength of the alloy.

关 键 词：Ti Al合金 保温时间 相变规律 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]