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利用金相显微镜、洛氏硬度计、摆锤式冲击试验机、WDW-200电子万能试验机对37CrMnMo钢不同淬火温度下的显微组织与力学性能进行了研究。结果表明:37CrMnMo钢的冲击吸收功,先随淬火温度的升高而增加,在870℃达到峰值后随淬火温度的升高而降低,硬度随淬火温度的升高缓慢增加。抗拉强度在本试验温度范围内变化不大,屈服强度随淬火温度的变化先增加后降低,在870℃达到峰值。在金相组织中发现,870℃的淬火+回火可以得到晶粒细小的回火索氏体,随温度继续升高,晶粒明显粗化。
The microstructure and mechanical properties of 37CrMnMo steel under different quenching temperatures were studied by metallographic microscope, Rockwell hardness tester, pendulum impact tester and WDW-200 electronic universal testing machine. The results show that the impact absorption energy of 37CrMnMo steel first increases with the increase of quenching temperature, reaches the peak value at 870 ℃ and then decreases with the increase of quenching temperature. The hardness increases slowly with the increase of quenching temperature. Tensile strength did not change much in this test temperature range. The yield strength first increased and then decreased with the change of quenching temperature, reaching its peak at 870 ℃. Found in the microstructure, 870 ℃ quenching and tempering can be fine grain tempered sorbite, with the temperature continues to rise, the grain coarsening significantly.