(1. 宝山钢铁股份有限公司 特钢事业部，上海 200940；2. 西北工业大学 材料科学与工程学院，西安 710072)
摘 要: 为了揭示变形程度和变形温度对β预制坯针状组织的影响规律，在800、820、840和860 ℃这4个不同温度以及20%、40%、60%和80%这4个不同应变量进行小饼等温压缩试验。研究结果表明：变形程度是影响TC17钛合金球化的主要因素。在变形量为40%~60%时，片状α组织受到剪切作用并发生动态再结晶；当变形量大于60%时，组织发生有效球化。在800~860 ℃温度范围内，变形温度越高，越有利于组织球化。
关键字: β预制坯；针状组织；球化；动态再结晶
hot deformation
（1. Special Steel Branch, Baoshan Steel Co., Ltd., Shanghai 200940, China;
2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:In order to disclosure the influence of deformation temperature and deformation degree on β preforming acicular structure, small pie isothermal compressing test with different strain levels from 20% to 80% was carried out at four different temperatures ranging from 800 to 860 ℃. The results show that deformation degree is the key factor which influences the spheroidization of TC17 alloy. When the deformation rate is 40%−60%, lamellar structure of α phase is broken by the shear force and dynamic recrystallization takes place. When the deformation rate is higher than 60%, the spheroidization is effective. In the tempeature range of 800−860 ℃, the higher the temperature, the better the spheroidization.
Key words: β preform; acicular structure; spheroidization; dynamic recrystallization
