基于碳偏析指数的高碳钢盘条网状渗碳体控制技术  

Control of grain boundary cementite of high carbon steel wire rods based on carbon segregation index

作　　者：郭大勇 高航 潘阳 宫文赫 王秉喜 杨迎强 Guo Dayong;Gao Hang;Pan Yang;Gong Wenhe;Wang Bingxi;Yang Yingqiang(State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan Liaoning 114001,China;Ansteel Iron and Steel Research Institute,Anshan Liaoning 114001,China;Wire Rod Plant of Ansteel,Anshan Liaoning 114001,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114001 [2]鞍钢集团钢铁研究院,辽宁鞍山114001 [3]鞍钢股份公司线材厂,辽宁鞍山114001

出　　处：《金属热处理》2024年第7期287-293,共7页Heat Treatment of Metals

摘　　要：开展了基于碳偏析指数的高碳钢盘条网状渗碳体控制技术研究。结果表明,对于碳含量为0.82%C的高碳钢,当碳偏析指数达到1.23和1.37时,采用20℃/s的冷却速度无法完全抑制先共析渗碳体的产生,试样在室温呈现先共析渗碳体、马氏体和珠光体混合组织,处于这种组织状态的盘条不适于拉拔。当碳偏析指数为1.17时,在冷却速度达到10℃/s条件下,试样网状渗碳体达到0级,索氏体化率达到90%,试样未见马氏体组织,具有这种组织的盘条适于拉拔。当碳偏析指数为1.00时,在0.25~10℃/s的冷速范围,高碳钢试样网状渗碳体为0级,未见马氏体组织。通过本文试验研究表明,在高碳钢盘条的生产过程需要建立基于碳偏析指数的网状渗碳体控制技术,满足用户对盘条拉拔性能的要求。Control technology of grain boundary cementite(GBC)precipitation based on carbon segregation index of high carbon steel wire rods was investigated.The results show that when the carbon segregation index of 0.82%C high carbon steel reach 1.23 and 1.37,cooling rate of 20℃/s is not fast enough to prevent GBC precipitation,and at this cooling rate,martensite,proeutectoid cementite and pearlite coexist in the microstructure of the high carbon steel at room temperature.The wire rods with this type of microstructure are not suitable for drawing.When the carbon segregation index of the high carbon steel reaches 1.17,the cooling rate of 10℃/s is fast enough to produce 0 level of GBC,90%sorbite and no martensite,which is beneficial to the drawing of high carbon steel wire rods.GBC dose not appear in the 0.8%C wire rods with carbon segregation index of 1.00 under the cooling rates of 0.25-10℃/s.According to above results,the setup of GBC control technology based on the carbon center segregation index is necessary to meet requirement of high carbon steel wire rod drawing of customers.

关 键 词：高碳钢盘条 网状渗碳体 碳偏析 冷却速度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]