Heat treatment with consistency of microstructure and serviceability for TC1 8 titanium alloy bar
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对TC18钛合金进行不同工艺的单相区热处理(温度为Tβ+(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300～430 μm范围,对应的单相区温度和保温时间分别为Tβ+(25～35)℃和 2～4 h.
TC18 titanium alloy was subjected to single-phase zone heat treatment with different processes(temperature of Tβ+(15-35)℃,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 300-430 μm,with the corresponding single-phase zone temperature and holding time being Tβ+(25-35)℃ and 2-4 h,respectively.
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