摘要
在两相区＋亚温区球化退火工艺的基础上,对SCM435冷镦钢进行球化退火试验。根据SCM435钢的化学成分,利用Thermo-Calc软件进行热力学计算得到对应的A1、A3温度分别为728℃、780℃。在综合分析影响球化效果因素的基础上,重点考虑亚温区保温温度、保温时间对球化效果的影响,依次进行试验方案的设定。由试验结果可知：当在两相区温度为758℃,保温30 min时,亚温区保温温度688-698℃,保温4-5 h时,会得到良好的球化效果和较低的硬度;缩短两相区保温时间为25 min时,亚温段在698℃下保温4 h,就可以得到很好的球化组织和较低的硬度。
Based on intercritical subcritical spheroidizing annealing,some experiments were carried out on SCM435 cold heading steel.The temperatures of critical points A1 and A3 were calculated to be 728 ℃ and 780 ℃,respectively,by using Thermo-Calc software based on chemical composition of the SCM435 steel. On basis of comprehensive analysis on the factors which influence spheroidizing process,with consideration of the holding temperature and time in the subcritical period,the values and scheme of the experiment were designed. The experimental results show that under the condition of the holding temperature at 758 ℃ for 30 min in the intercritical period,a good spheroidizing effect can be obtained when the samples are held between 688 ℃ or 698 ℃ for 4 - 5 h; while decreasing the time to 25 min in the intercritical period,preferable spheroidized microstructure and lower hardness can be obtained when annealed at 698 ℃ for 4 h in the subcritical area.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第11期92-97,共6页
Heat Treatment of Metals
关键词
SCM435钢
球化退火
两相区
碳化物
冷镦钢
SCM435 steel
spheroidizing annealing
two-phase region
carbide
cold heading steel
作者简介
南鹏飞（1990-），男，硕士研究生，研究方向：中低碳合金钢的强韧性，E-mail：nanpengfei123@163．com。
通讯作者：王福明，教授，博士生导师，联系电话：010-62332872，E-mail：wangfuming@metall．ustb．edu．cn
