β锻造Ti-6Al-4V合金力学性能各向异性  

Mechanical properties anisotropy of Ti−6Al−4V alloy fabricated by β forging

作　　者：翁涵博 黄森森[2] 杨杰 齐敏[2,3] 马英杰 王宇翔[2] 许道奎 邱建科 雷家峰[2,3] 龚斌 杨锐[2,3] Han-bo WENG;Sen-sen HUANG;Jie YANG;Min QI;Ying-jie MA;Yu-xiang WANG;Dao-kui XU;Jian-ke QIU;Jia-feng LEI;Bin GONG;Rui YANG(College of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,沈阳110142 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [3]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第11期3348-3363,共16页中国有色金属学报（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA22010101);the National Natural Science Foundation of China(No.51871225);the National Key Research and Development Program of China(No.2021YFC2801800);the Youth Innovation Promotion Association CAS and Liaoning Revitalization Talents Program,China(No.XLYC1907005).

摘　　要：研究β锻造Ti-6Al-4V(Ti64)合金拉伸性能和断裂韧性的各向异性。对饼材不同取向的显微组织和晶体学织构进行分析,同时研究取样方向对拉伸性能、断裂韧性的影响。结果表明,Ti64饼材原始β晶粒呈扁平状。室温下合金主要由α相构成,β锻造后β→α相变产生的多个α相变体导致α相织构强度较低。力学性能各向异性的主要影响因素为原始β晶粒形貌以及与α织构相关的滑移。采用J积分阻力曲线法测定合金的起裂韧性,并将起裂韧性KJIC分为内在韧性和外在韧性。内在断裂韧性各向异性主要与原始β晶粒对裂纹尖端塑性区范围的影响相关;外在断裂韧性主要与α片层与集束对裂纹曲折程度的影响相关。The anisotropy of tensile properties and fracture toughness of Ti-6Al-4V(Ti64)alloy fabricated byβforging was investigated.In order to evaluate anisotropic mechanical properties,the microstructure and crystallographic texture of billets with different orientations were characterized,and the influence of sampling direction on tensile properties and fracture toughness was studied.The results reveal that the priorβgrains of Ti64 billet display pan-cake-type characteristics.At room temperature,the alloy is mainly composed ofαphase,and severalαphase variants produced byβ→αphase transformation decrease theαtexture intensity.The anisotropy of mechanical properties is affected by priorβgrain morphology and the slip activation related toαtexture.The initiation toughness was obtained by the J-integral resistance curve method.The initiation toughness was divided into intrinsic and extrinsic toughness by calculation.The anisotropy of intrinsic toughness is mainly attributed to the size of crack tip plastic zone,which is affected by priorβgrain morphology.In contrast,the extrinsic toughness is affected by zigzag degree of crack,which is mainly influenced byαlamellae and colonies.

关 键 词：钛合金 Β锻造 织构 J积分 断裂机理 各向异性 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG319[金属学及工艺—金属材料]