硅对厚规格热轧带钢自回火冲击韧性的影响研究  

Study on the Influence of Silicon on the Self Tempering Impact Toughness of Thick Hot-rolled Strip Steel

作　　者：康欣 陈彤 任树洋 汪云辉[1] 郭隆 刘卓琳 Kang Xin;Chen Tong;Ren Shuyang;Wang Yunhui;Guo Long;Liu Zhuolin(Technical Center,Tangshan Iron and Steel Group Co.,Ltd.,Tangshan Hebei 063200,China)

机构地区：[1]唐山钢铁集团有限责任公司技术中心,河北唐山063200

出　　处：《山西冶金》2025年第2期26-28,31,共4页Shanxi Metallurgy

摘　　要：利用夏比冲击实验对不同硅含量实验钢在不同温度下的冲击韧性进行检测,结果表明,w(Si)由0.05%提高至0.40%时,实验钢低温下的冲击韧性均得到显著提升,其次是韧脆转变也发生明显变化,随着硅含量的提高,韧脆转变温度降低。对两种硅含量实验钢显微组织进行观察,可以看出其组织及各相的含量也存在明显的差异,硅含量较低时显微组织主要由多边形铁素体和珠光体组成,而硅含量提高时实验钢中存在一定量的伪珠光体和交叉针状铁素体,且高硅含量钢中伪珠光体体积占比在50%以上,这种组织可显著提高实验钢的韧性,降低其韧脆转变温度。The impact toughness of experimental steel with different silicon contents at different temperatures was tested using the Charpy impact experiment.The results showed that when w(Si)increased from 0.05%to 0.40%,the impact toughness of the experimental steel at low temperatures was significantly improved,followed by a significant change in the ductile brittle transition temperature.With the increase of silicon content,the ductile brittle transition temperature decreased.Observing the microstructure of two experimental steels with different silicon contents,it can be seen that there are significant differences in their microstructure and the content of each phase.When the silicon content is low,the microstructure is mainly composed of polygonal ferrite and pearlite,while when the silicon content is increased,there is a certain amount of pseudo pearlite and cross needle ferrite in the experimental steel.Moreover,the proportion of pseudo pearlite in high silicon content steel is more than 50%.This microstructure can significantly improve the toughness of the experimental steel and reduce its ductile brittle transition temperature.

关 键 词：冲击韧性 伪珠光体 针状铁素体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]