【摘要】 对上限温度为500、650、800℃高温短时热循环200次后的Ti-6Al-4V合金室温力学性能和组织进行了研究。结果表明:循环温度对合金强度影响较为明显,循环温度的升高使合金抗拉强度降低;分析认为:温度高于650℃,实验合金组织中β相逐渐分解碎化,β相含量减少和α晶粒逐渐长大是强度降低的主要原因。更多还原

【Abstract】 Microstructure and tensile properties of Ti-6Al-4V alloy after thermal cycling in the temperature range of room temperature to 500 ℃,650 ℃ and 800 ℃ were studied.The results show that with increasing of thermal cycling temperature,tensile strength of Ti-6Al-4V alloy decreases,β phase disintegrates and its volume fraction is reduced,and α grain grows gradually.It is argued that when cycling temperature below 650 ℃,the disintegration of β phase is responsible for the strength decreasing and when temperature above 650 ℃,the strength decreasement is ascribed to the decrease of β phase amount and α grains growth.更多还原