热处理对H13热作模具钢的显微结构和性能的影响  

Effects of Heat Treatment on Microstructure and Mechanical Properties of H13 Die Steel

作　　者：杨青[1] 林文松[1] 王婕丽[1] 程超[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《热加工工艺》2012年第22期210-212,共3页Hot Working Technology

摘　　要：研究预备热处理工艺、回火温度及深冷处理对H13热作模具钢的显微结构和力学性能的影响。结果表明,对成分偏析且锻造不足的H13钢,在常规的热处理条件下,适当提高回火温度(如630℃)可部分消除H13钢的带状组织;对该种钢材热处理前进行扩散退火+球化退火预先热处理,能更有效改善其金相组织,较大幅度提高材料的冲击韧度;深冷处理后,残余奥氏体转变为马氏体,同时碳化物分布更加细小、均匀,可进一步提高H13钢的力学性能。The effects of heat treatment on the microstructure and mechanical properties of H 13 steel were studied. The results show that an appropriate increase in the tempering temperature （e.g. 630℃） in a conventional heat treatment process can be used to partially eliminate the banded structure of H13 steel with the composition segregation and poor forging. Preheat treatment including diffusion annealing and spheroidization annealing is more effective to improve the undesired microstructure and increases the impact toughness of the material. The results show that the retained austenite is transformed to be martensite and fine carbide particles are precipitated uniformly in the steel after cryogenic treatment, so as to further improve the mechanical properties of H 13 steel.

关 键 词：H13钢 深冷处理 预备热处理 残余奥氏体 力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]