【摘要】 通过DMA(动态热机械分析仪)测量Fe-Cr-Mo合金阻尼性能,研究了热处理工艺对Fe-Cr-Mo合金阻尼性能的影响;通过OM进行组织观察,并且分析了不同退火温度及冷却方式下合金微观组织对阻尼性能的影响。结果表明,合金在950~1150℃的退火温度范围内,随着退火温度升高,内耗增大;并且水冷后的合金内耗较小,炉冷后的合金内耗较大。分析认为,950℃热处理,内应力大,内耗较小,并且由于晶界多,磁畴壁移动困难,对应边敏感度小,而1150℃的热处理则内应力小,内耗较大,并且由于晶粒长大,晶界数量少,磁畴壁移动容易,对应边敏感度大。由于水冷冷速过快,造成成分不均,内应力较大,内耗小于炉冷的内耗。更多还原

【Abstract】 In this paper,DMA was used to test the damping capacity of Fe-Cr-Mo alloy,in this way,the damping capacity of Fe-Cr-Mo alloy heat-treated at different temperatures was investigated,and the relationship between damping capacity and annealing temperature was analyzed.By Optical microscope,how the microstructure influenced damping capacity was discussed.The experimental results show,in the range of 950-1150 ℃,the internal friction increases as the temperature increases.At 950 ℃,due to the more internal stress,the damping capacity is lower,and due to the more grain boundary,the domains are uneasy to remove,the sensitivity to strain is not significant.By contrary,at 1150℃,due to the smaller internal stress,the damping capacity is higher,and less grain boundary may lead the easy movement of domains,so the sensitivity to strain is significant.Water cooling may lead uneven components and more internal stress,so damping capacity is worse.更多还原