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在室温至900℃温度范围内、不同初始应变速率(8×10~(-5)、8×10~(-4)和8×10~(-3)s~(-1))下,利用单向拉伸实验研究了温度与应变速率对Invar 36合金拉伸力学性能的影响,并选择室温、600和800℃进行三点弯曲实验,分析温度对Invar 36合金厚板回弹规律的影响。结果表明,Invar 36合金的屈服强度、抗拉强度随温度的升高而大幅降低;延伸率则先升高后降低,在600℃时出现峰值,达到69.2%,比室温提高了55%,这主要由于动态再结晶使塑性提高所致。当温度较低时(室温和500℃),应变速率对Invar 36合金力学性能影响不大;但当温度升高至800℃时,Invar 36合金的强度和塑性均随初始应变速率的减小而大幅减小,初始应变速率由8×10~(-3)s~(-1)降至8×10~(-5)s~(-1),屈服强度、抗拉强度和延伸率分别降低了38%、47%和50%;由室温升高至800℃时,三点弯曲回弹量减小87.0%。
Under the different initial strain rates (8 × 10 -5, 8 × 10 -4 and 8 × 10 -3 s -1) at room temperature to 900 ℃, The effects of temperature and strain rate on the tensile properties of Invar 36 alloy were investigated by uniaxial tensile tests. Three-point bending tests were carried out at room temperature, 600 and 800 ℃, and the influence of temperature on the rebound rule of Invar 36 alloy slab was analyzed. The results show that the yield strength and tensile strength of Invar 36 alloy decrease with the increase of temperature. The elongation of the alloy increases first and then decreases, reaching the peak at 600 ℃, reaching 69.2%, which is 55% higher than that at room temperature. Mainly due to dynamic recrystallization plasticity due to. When the temperature is low (room temperature and 500 ℃), the strain rate has little effect on the mechanical properties of Invar 36 alloy. However, the strength and plasticity of Invar 36 alloy decreases with the initial strain rate when the temperature increases to 800 ℃ The initial strain rate decreased from 8 × 10 -3 s -1 to 8 × 10 -5 s -1 and the yield strength, tensile strength and elongation decreased 38%, 47% and 50% respectively. When the room temperature increased to 800 ℃, the three-point bending springback decreased by 87.0%.