【摘要】：采用TEM和MTS Landmark試驗(yàn)機(jī)研究鹽浴大過冷工藝下SWRS82B珠光體鋼亞結(jié)構(gòu)組織變化及其力學(xué)性能,從熱力學(xué)、動(dòng)力學(xué)和碳原子擴(kuò)散等方面探索最優(yōu)熱處理工藝。研究結(jié)果表明,大過冷工藝下珠光體亞結(jié)構(gòu)組織明顯細(xì)化,珠光體團(tuán)尺寸細(xì)化至2.39μm,最小片層間距為62.11 nm,且出現(xiàn)粒徑55 nm左右的納米級(jí)滲碳體,三者受大過冷工藝的過冷溫度和時(shí)間的影響較復(fù)雜;珠光體鋼強(qiáng)度主要由珠光體片層間距決定,而塑性主要受團(tuán)尺寸影響,二者均受納米級(jí)滲碳體影響,隨大過冷工藝的過冷溫度和時(shí)間的變化而變化。最優(yōu)大過冷工藝參數(shù)為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，

本文編號(hào)：2265878