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将Fe-16Cr-2.5Mo合金在1100℃保温1 h后分别进行了炉冷、空冷和油冷。研究了热处理冷却方式对合金微观组织和力学性能的影响。结果表明:热处理后晶粒长大,晶粒尺寸与冷却方式无关;随着冷却速度的增大,合金强度提高,塑性降低,弹性模量基本不变,合金力学性能的变化与晶界析出相有关。微观断口分析表明,Fe-16Cr-2.5Mo合金试样在拉伸载荷作用下表现为韧性断裂;对于热处理的合金,随着冷却速度增大,韧窝平均直径与深度、韧窝所占比例均减小。
The Fe-16Cr-2.5Mo alloy was heat-treated at 1100 ℃ for 1 h, then cooled by furnace, air-cooled and oil-cooled respectively. The effect of heat treatment cooling on the microstructure and mechanical properties of the alloy was studied. The results show that grain growth and grain size are not related to the cooling mode after heat treatment. With the increase of cooling rate, the strength of the alloy increases, the plasticity decreases and the elastic modulus basically remains unchanged. The variation of the mechanical properties of the alloy and the grain boundary precipitated phase related. The microscopic fracture analysis showed that the samples of Fe-16Cr-2.5Mo alloy showed ductile fracture under the tensile load. For the heat-treated alloys, the average diameter and depth of dimples and the proportion of dimples Decrease