钛对含硫钢中硫化物的影响  

Effect of titanium on sulfide in a sulfur-containing steel

作　　者：焦亚兴 朱坦华 李耀强 高小勇 张立峰 JIAO Yaxing;ZHU Tanhua;LI Yaoqiang;GAO Xiaoyong;ZZHANG Lifeng(School of Materials Science and Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]燕山大学材料科学与工程学院,河北秦皇岛066004 [2]燕山大学机械工程学院,河北秦皇岛066004 [3]北方工业大学机械与材料工程学院,北京100144

出　　处：《钢铁研究学报》2024年第6期727-735,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(U22A20171,52274398)。

摘　　要：研究了Ti元素对42CrMoS4含硫钢中硫化物的影响机制。采用SEM、EDS和ASPEX设备对硫化物进行表征,小样电解实验对硫化物的三维形貌进行表征,并采用FactSage软件对夹杂物的形成过程进行热力学分析。随着Ti含量的增加,钢中纯MnS的数量减少,而MnS-TiN型复合夹杂物的数量增加;当Ti质量分数为309×10-6时,析出Ti4C2S2型硫化物。钢中硫化物的演化轨迹为:MnS→MnS-TiN→Ti4C2S2。Ti4C2S2的尺寸明显小于MnS和MnS-TiN复合夹杂物。Ti4C2S2的抗变形能力强于MnS和MnS-TiN复合夹杂物。随着Ti含量的增加,硫化物的数量密度先增加后降低,硫化物平均尺寸先减小后增加;当Ti质量分数为400×10-6时,硫化物的数量密度最大、平均尺寸最小。对于42CrMoS4含硫钢,Ti质量分数为400×10-6时较为合理。The effect of titanium on sulfide inclusions in 42CrMoS4 sulfur-containing steel was investigated.The sulfides were characterized by SEM,EDS and ASPEX.The three-dimensional morphology of the sulfides was characterized by electrolysis experiment.With the increase of Ti content,the number of pure MnS decreased and the number of MnS-TiN composite inclusions increased.When the mass fraction of Ti was 309 X10-°,Ti,C,S2 sulfide precipitated.The trajectory for the evolution of sulfides in the steel was:MnS-→MnS-TiN->Ti,C,Sz.The size of Ti,C,S,was obviously smaller than that of MnS and MnS-TiN,and the deformation resistance of Ti,C,S2 was obviously stronger than that of MnS and MnS-TiN.With the increase of Ti content,the number density of sulfides first increased and then decreased,and the size of sulfides first decreased and then increased.When the mass fraction of Ti was 400X 10-°,the number density of sulfide was the largest and the average size was the smallest.For 42CrMoS4 sulfur-containing steel,the optimized mass fraction of Ti element was 400 X10-6.

关 键 词：含硫钢 钛含量 MNS Ti4C2S2 MnS-TiN 热力学计算 

分 类 号：TG142.1[一般工业技术—材料科学与工程]