TA18鈦合金管收縮應變比的測定及其影響因素

TA18鈦合金管收縮應變比的測定及其影響因素Contraction Strain Ratio Determination and Its Influencing Factors of TA18 Titanium Alloy Tube

對TA18鈦合金管收縮應變比rCS的測定原理和方法進行了探討, 同時分析了影響rCS測定的幾種因素。結果表明: 取樣長度、熱處理狀態、拉伸速率和伸長率終止條件等因素均對rCS的測定結果有顯著影響, 導致rCS測定結果偏低或重現性較差。對于本試驗12 mm×0.8 mm的TA18鈦合管, 其rCS測定合適的試驗條件如下: 試樣熱處理狀態為退火態, 取樣長度為150 mm, 兩端堵頭長度為30 mm, 拉伸速率為1 mm·min-1或2 mm·min-1, 試驗終止條件為7%伸長率。

The determination principle and method of contraction strain ratio rCS of TA18 titanium alloy tube were discussed. At the same time, several factors influencing the determination of rCS were analyzed. The results show that factors such as sampling length, heat treatment condition, tensile rate and elongation terminating condition all had significant effects on the testing results of rCS, resulting in lower testing results or poor reproducibility. For the test 12 mm×0.8 mm TA18 titanium alloy tube, the feasible determination conditions of rCS were as follows: the heat treatment condition of specimen was annealing state, the sampling length was 150 mm, the plug length was 30 mm, the tensile rate was 1 mm·min-1 or 2 mm·min-1, and the test terminating elongation was 7%.

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