锻压技术

β锻造参数对TC17钛合金组织性能的影响

英文标题：Influence of β forging parameters on microstructure and properties of titanium alloy TC17

分类号：TG156

出版年,卷(期):页码：2018,43(2):0-0

摘要：

基于TC17合金β跨相区锻造试验，研究了始锻温度、变形程度、锻后冷却方式对TC17钛合金组织和性能的影响。试验表明：TC17钛合金的显微组织演变和室温力学性能对于β锻造参数表现出不同程度的敏感性；随着始锻温度的升高，晶粒细化程度增大，不同的始锻温度可显著影响合金的强度；通过增大合金的变形程度可显著改善组织中的残留魏氏组织，进而对强度产生较大影响，合金内部粗晶组织的变形不均匀化进一步增强；锻后冷却方式为缓冷时，晶内次生α相长度增加，可有效提高合金的断裂韧性。在始锻温度为918 ℃、变形程度为60%、锻后冷却方式为缓冷的条件下，TC17钛合金的室温力学性能匹配较佳。

Based on β forging experiment of titanium alloy TC17, the influences of initial forging temperature, deformation degree and cooling mode after forging on microstructures and mechanical properties of titanium alloy TC17 were studied. The experiment shows that the microstructure evolution and mechanical properties at room temperature of titanium alloy TC17 appear varying degrees of sensitivity to the parameters of the β forging. With the increase of the initial forging temperature, the grain refinement increases, and the different initial forging temperature can significantly affect the strength of titanium alloy TC17. However, the increase of deformation degree of titanium alloy can significantly improve the residual Widmanstatten organization, and the strength of titanium alloy TC17 is expected greatly. Therefore, the deformation inhomogenization of the coarse grain structure inside the alloy is further enhanced. Thus, when the cooling mode is slow-cooling after forging, the length of the intracry-stalline secondary α phase increases and the fracture toughness of alloy is effectively improved. At the initial forging temperature of 918℃, the deformation degree of 60% and the slow-cooling, the mechanical properties of titanium alloy TC17 at room temperature are better.

基金项目：

作者简介：袁士翀（1982-），男，硕士，高级工程师 E-mail：yuanshichong@126.com

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