硅脱氧弹簧钢55SiCr玻璃态夹杂在铸坯加热过程中的结晶变化  

Crystallization behavior of glassy inclusions in Si-killed spring steel 55SiCr during bloom and billet heating

作　　者：孟耀青 王伟 李家杨 赵昊乾 逯志方 秦树超 MENG Yaoqing;WANG Wei;LI Jiayang;ZHAO Haoqian;LU Zhifang;QIN Shuchao(Technology Center of Xingtai Iron&Steel Co.,Ltd.,Xingtai 054027,China;Hebei Engineering Technology Innovation Center for Wire Rod,Xingtai 054027,China)

机构地区：[1]邢台钢铁有限责任公司技术中心,河北邢台054027 [2]河北省线材工程技术创新中心,河北邢台054027

出　　处：《炼钢》2021年第2期58-61,69,共5页Steelmaking

基　　金：河北省省级科技计划资助项目(205676134H)。

摘　　要：将55SiCr硅脱氧弹簧钢LF精炼结束提桶样分别随大方坯开坯加热和热轧坯轧制加热处理,并采用FEI Explorer 4自动扫描电镜对提桶样热处理前后氧化物夹杂的形貌与成分变化进行检测。检测分析表明,不管是随大方坯高温扩散还是热轧坯加热处理,玻璃态夹杂物均发生结晶现象。在1 250℃保温约2.5 h,夹杂物结晶尺寸较大,且结晶位置已贯穿夹杂物内部;在1 020℃保温约0.5 h,夹杂物结晶尺寸较小,大颗粒结晶位置主要发生在夹杂物边部。The bucket-shaped samplers of Si-killed spring steel 55 SiCr after LF refining were heated with bloom before blooming and billet before hot rolling respectively. And the morphology and composition changes of oxide inclusions before and after heat treatment were detected by FEI Explorer 4 automated scanning electron microscope. The results show that some crystalline phases appears on the glassy inclusions in both cases. When the holding temperature is kept at 1 250 ℃ for about 2.5 h, the crystalline phase is coarse and the crystallization position has penetrated through the whole inclusions. In contrast, when the holding temperature is kept at 1 020 ℃ for about 0.5 h, the crystallizing size is small, and the crystallization position of large particle mainly occurs at the edge of inclusions.

关 键 词：弹簧钢 硅脱氧 玻璃态夹杂 结晶 

分 类 号：TF762.5[冶金工程—钢铁冶金]