【作者】 朱远志； 尹志民； 郭昌明； 滕浩；

【Author】 Zhu Yuanzhi Yin Zhimin Guo Changming Teng Hao( School of material science and engineering, Central South University,Changsha, 410083)( The 70th researching institute of Chinese armory group, Datong,037036)

【机构】 中南大学材料学院； 中国兵工集团第七○研究所；

【摘要】 本文利用DTA、热膨胀仪、XRD、扫描电镜和能谱等手段分析了淬火温度对合金组织性能的影响,计算了合金晶格常数和合金基体中含碳量随淬火温度变化而变化的规律。研究发现,在840-900℃淬火,合金的硬度随着温度的升高而升高;当淬火温度在900-1100℃之间时,硬度曲线基本保持平直;当淬火温度超过1100℃,硬度显著下降。分析发现,随淬火温度升高,溶入基体中的碳化物数量增加,淬火后残余奥氏体量增加。当淬火温度升高到1150℃以上时,合金碳化物Fe2MoC开始溶入基体,晶粒也明显长大。合金在1100℃左右淬火,既能保证较好的力学性能,又能得到比较理想的微观组织,因此1100℃应当是该合金比较理想的淬火温度。更多还原

【Abstract】 DTA, thermal expansion, XRD, SEM have been used to evaluate the effect of heat treatment processing on the mechanical properties and microstructure of a new PM Fe-6Co-1Ni-5Cr-5Mo-1C alloy. It is shown that the hardness of the alloy increases with increasing of quenching temperature between 840 -900℃ , maintains constant between 900 -1100℃ and decreases rapidly when temperature is higher than 1100℃ . The relations among lattice parameters, carbon fraction in the matrix and quenching temperature have also been discussed. With increasing of quenching temperature, more carbon is dissolved in matrix. When the quenching temperature is higher than 1150℃ , Fe2MoC begins to be dissolved in matrix greatly and grains coarsen rapidly. Therefore 1100℃ should be an ideal quenching temperature.更多还原