大过冷工艺下珠光体钢亚结构组织及力学性能
发布时间：2018-10-12 11:02
【摘要】：采用TEM和MTS Landmark试验机研究盐浴大过冷工艺下SWRS82B珠光体钢亚结构组织变化及其力学性能,从热力学、动力学和碳原子扩散等方面探索最优热处理工艺。研究结果表明,大过冷工艺下珠光体亚结构组织明显细化,珠光体团尺寸细化至2.39μm,最小片层间距为62.11 nm,且出现粒径55 nm左右的纳米级渗碳体,三者受大过冷工艺的过冷温度和时间的影响较复杂;珠光体钢强度主要由珠光体片层间距决定,而塑性主要受团尺寸影响,二者均受纳米级渗碳体影响,随大过冷工艺的过冷温度和时间的变化而变化。最优大过冷工艺参数为300℃/3 s+550℃。
[Abstract]:The changes of substructure and mechanical properties of SWRS82B pearlite steel under salt bath and large undercooling process were studied by TEM and MTS Landmark. The optimal heat treatment process was explored from the aspects of thermodynamics, kinetics and diffusion of carbon atoms. The results showed that the structure of pearlite substructure was finer, the size of pearlite cluster was 2.39 渭 m, the minimum lamellar spacing was 62.11 nm, and the size of nano-sized cementite was about 55 nm. The strength of pearlite steel is mainly determined by the lamellar spacing of pearlite, while the plasticity is mainly affected by the size of clusters, both of which are affected by nanocrystalline cementite. The supercooling temperature and time change with the large supercooling process. The optimum process parameter of large supercooling is 300 鈩，
本文编号：2265878
[Abstract]:The changes of substructure and mechanical properties of SWRS82B pearlite steel under salt bath and large undercooling process were studied by TEM and MTS Landmark. The optimal heat treatment process was explored from the aspects of thermodynamics, kinetics and diffusion of carbon atoms. The results showed that the structure of pearlite substructure was finer, the size of pearlite cluster was 2.39 渭 m, the minimum lamellar spacing was 62.11 nm, and the size of nano-sized cementite was about 55 nm. The strength of pearlite steel is mainly determined by the lamellar spacing of pearlite, while the plasticity is mainly affected by the size of clusters, both of which are affected by nanocrystalline cementite. The supercooling temperature and time change with the large supercooling process. The optimum process parameter of large supercooling is 300 鈩，
本文编号：2265878
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