TC18钛合金棒材的组织-服役性能一致性热处理  

Heat treatment with consistency of microstructure and serviceability for TC18 titanium alloy bar

作　　者：尹卫东 尹慧 向伟 罗恒军 吕孝根 翟瑞志 徐邹圆 Yin Weidong;Yin Hui;Xiang Wei;Luo Hengjun;Lu Xiaogen;Zhai Ruizhi;Xu Zouyuan(Chian National Erzhong Group Deyang Wanhang Die Forging Co.,Ltd.,Deyang Sichuan 618000,China)

机构地区：[1]中国第二重型机械集团德阳万航模锻有限公司,四川德阳618000

出　　处：《金属热处理》2024年第9期232-236,共5页Heat Treatment of Metals

摘　　要：对TC18钛合金进行不同工艺的单相区热处理(温度为T_(β)+(15~35)℃,时间为0.5、1、2、4 h),获得不同晶粒尺寸的初始组织,探究晶粒尺寸对双重退火TC18钛合金棒材性能的影响,得到其组织-服役性能一致性的热处理工艺。结果表明,随平均晶粒尺寸增大,TC18钛合金的抗拉强度先升高后降低,而断后伸长率、断面收缩率和断裂韧度则呈相反趋势。为使TC18钛合金构件既具有较高的抗拉强度,又具有良好的塑性和韧性,晶粒尺寸需控制在300~430μm范围,对应的单相区温度和保温时间分别为T_β+(25~35)℃和2~4 h。TC18 titanium alloy was subjected to single-phase zone heat treatment with different processes(temperature of T_(g)+(15-35)C,and time of 0.5,1,2,4 h)to obtain the initial microstructure with different grain sizes.The effect of grain size on the properties of the duplex annealed TC18 titanium alloy bar was investigated,and the heat treatment process with consistent microstructure and serviceability was obtained.The results show that with the increase of average grain size,the tensile strength of the TC18 titanium alloy increases first and then decreases,while the elongation after fracture,percentage reduction of area and fracture toughness show the opposite trend.To ensure that the TC18 titanium alloy components have both high tensile strength and good plasticity and toughness,the grain size should be controlled within the range of 300-430μm,with the corresponding single-phase zone temperature and holding time being Tg+(25-35)℃and 2-4 h,respectively.

关 键 词：TC18钛合金 单相区温度 保温时间 晶粒尺寸 服役性能 

分 类 号：TG156[金属学及工艺—热处理]