Ti-Al-Zr钛合金锻材的断裂韧度测定及分析  

Test and Analysis of Fracture Toughness of Ti-Al-Zr Titanium Alloy

作　　者：李远睿[1] 黄荣[1] 黄本多[1] 邱绍宇[2] 李卫军[2] 

机构地区：[1]重庆大学材料科学与工程学院,400030 [2]中国核动力研究设计院核燃料及材料国家级重点实验室,成都610041

出　　处：《核动力工程》2003年第5期439-444,共6页Nuclear Power Engineering

基　　金：由核燃料及材料国家级重点实验室基金项目(99JS85. 6. 1. JW2004)资助

摘　　要：针对低强度高塑性的Ti-Al-Zr钛合金锻材的断裂韧度的测定工作,先根据GB4161-84《金属材料平面应变断裂韧度试验方法》,尝试了采用紧凑拉伸试样直接测定其KIC值,但试验后发现样品呈明显的平面应力状态。分析原因后,根据GB/T 2358-94《金属材料裂纹尖端张开位移试验方法》采用多试样法,测定出各试样的裂纹尖端张开位移(COD)量。对从6个有效试样上获得的数据进行了处理,绘制出其δR阻力曲线,并拟合出阻力曲线方程。然后以启裂点(0=Da)的裂纹张开位移量作为δc,换算出这种钛合金的平面断裂韧度KIC值。对样品断口进行SEM分析后,探讨了影响断裂韧度的各种因素,并提出了提高这种钛合金材料断裂韧度的途径。In order to measure the fracture toughness of Ti-Al-Zr alloy forging of low-strength and high-toughness, this report firstly tries to get the value of KIC by testing the compact tensile sample according to GB 4161-84 Standard Test Method for Plane-strain Tracture Toughness of Metallic Materials. Tth test found that the sample is in the apparent situation of plane stress. After analyzing the reason, we test the value of the crack tip opening displace (COD) of every sample using multiple samples according to GB/T 2358-1994 Test Method for Crack-tip Opening Displacement Measurement of Metallic Materials. A resis-tance curves(δR curves) and the equation of the curves are obtained by processing the data of six effective samples. Then crack-tip opening displacement of initial crack points (0=Da) and fracture toughness KIC of such titanium alloy are calculated. After SEM analysis of crack samples, various factors influencing the fracture toughness of Ti-Al-Zr alloy was discussed, and an approach to improve the fracture toughness of such titanium alloy was presented.

关 键 词：单相 钛合金 锻材 裂纹尖端张开位移 断裂韧度 

分 类 号：TL111.8[核科学技术—核能科学]