碳锰含量对低碳钢超细铁素体组织退火过程的影响  

INFLUENCE OF C AND Mn CONTENT OF LOW CARBON STEEL ON ULTRA-FINE FERRITE MICROSTRUCTURE FORMATION DURING ANNEALING AFTER DEFORMATION-ENHANCED TRANSFORMATION

作　　者：田朝旭[1] 杨平[1] 孙祖庆[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《钢铁》2004年第4期49-53,共5页Iron and Steel

基　　金：国家重点基础研究规划 (973 )-"新一代钢铁材料重大基础研究"项目 (G19980 615 0 6);教育部"高等学校骨干教师资助计划"的资助

摘　　要：对 0 8钢和 2 0 Mn形变强化相变后退火过程的组织演变的观察表明 ,超细铁素体退火时的长大是应变能及晶界能共同驱动的正常长大 ,长大阻力是第二组织的钉扎。形变使奥氏体以离异方式加速分解。在所用应变量下 ,0 8钢中的超细铁素体快冷到 6 0 0℃以下不会有明显长大。碳锰含量的提高降低了形变强化相变进行的程度 ,使随后的铁素体长大受到相变驱动力的作用并加大了带状组织特征 ,铁素体难以正常长大。2 0 Mn中第二组织的增多提供了形变强化相变后调整第二组织的空间及必要性。总结了碳锰含量、退火温度。The microstructure with ultra fine ferrite grains of 08 and 20Mn steel produced through deformation enhanced transformation reveals that the growth of ultra fine ferrite during annealing is controlled by stored energy, grain boundary energy and the pinning of secondary phase The decomposition of deformed austenite proceeds in an accelerated, divorced manner due to deformation At the given strain no apparent growth of ultra fine ferrite was detected during annealing below 600 ℃ for 08 steel The increase of C and Mn content restricts normally the growth rate of ferrite However, it also reduces the transformed ferrite volume fraction, leading to the further formation or growth of ferrite due to retained driving force of γ/α phase transformation Moreover, the band microstructure occurs easily There exist wide possibilities and the necessity of controlling properly the second phase for 20Mn A relationship between the microstructure of ultra fine ferrite and C, Mn content and annealing temperature is proposed

关 键 词：低碳钢 形变强化相变 超细铁素体 退火 应变能 晶界能 

分 类 号：TG156.2[金属学及工艺—热处理]