摘要
在温度200~1000℃、应变速率0.1~4 mm/min条件下对航空TC4钛合金进行高温拉伸试验,研究了拉伸温度和应变速率对钛合金力学性能的影响。采用金相显微镜和SEM进行微观组织及形貌观察、使用显微硬度计进行硬度测试,并用XRD进行物相分析。结果表明:随拉伸温度的升高,该合金的屈服强度和抗拉强度线性降低;伸长率先升高后降低;高温断口呈现蛇形滑移微观形貌,白色絮状物为钛的氧化物;硬度呈折线性变化趋势。随拉伸速率的增大,屈服强度和抗拉强度增大,伸长率先增大后减小。
The high temperature tensile tests of aeronautical TC4 titanium alloy at 200-1000 -C and strain rate of 0.1-4 mm/min were conducted. Then, the influence of tensile temperature and strain rate on the mechanical properties of titanium alloy were studied. Metalloscope and SEM were used to observe the microstructure and micro-morphology. The hardness tester was used to test the microhardness, and the phase was analyzed by XRD. The results show with the tensile temperature increasing, the yield strength and tensile strength of the alloy decrease linearly; and the elongation increases first and then decreases; the high temperature fracture shows a serpentine slip micro-morphology and the white flocculent material is titanium oxide; the hardness shows a polygonal line change. With the increase of tensile rate, the yield strength and tensile strength increase; and the elongation first increases and then decreases.
出处
《热加工工艺》
CSCD
北大核心
2017年第10期86-89,93,共5页
Hot Working Technology
基金
国家自然科学基金(51301198)
中央高校基本科研业务费专项(3122014H005)
关键词
TC4钛合金
高温拉伸
微观形貌
断裂机理
TC4 titanium alloy
high temperature tensile
microstructure
fracture mechanism
作者简介
王付胜（1987-），男，河南人，助理实验师，硕士，从事合金材料性能研究和教学工作；E—mail：2292598008@qq．com
