摘要
基于“氧化物冶金”思想,提出“氧化物冶金生产技术”。利用此技术控制出钢后氧的含量,生产出20MnSi钢。利用金属显微镜图像分析仪,并借助扫描电镜,分析出钢后不同氧含量对夹杂物及有效夹杂物析出的影响。通过金相显微镜、扫描电镜、能谱分析技术和ImageJ软件,讨论了夹杂物尺寸、数量、成分、形状和奥氏体尺寸等对一次针状铁素体形成的影响。结果表明:当夹杂物尺寸小于4 μm时,最有利于诱导生成一次针状铁素体;在此范围内,有效夹杂物尺寸越大,依附其生长的针状铁素体的数量越多;有效夹杂物中O-Ca-F-Mn-S,O-Si-Ca-V-Mn-S和O-Si-Ca-Ti-Mn-S类型夹杂物诱导生成一次针状铁素体的能力强;粗大奥氏体晶粒有助于一次针状铁素体在晶粒内的有效夹杂物上形核长大。最终揭示了奥氏体在有效夹杂物表面优先析出C,形成向四周扩展的C晶界,一次针状铁素体优先在有效夹杂物C晶界夹缝中形核长大的机理。
Based on the concept of"oxide metallurgy",the"oxide metallurgy production technology"was proposed.Using the technology to control the oxygen content after steelmaking,20MnSi steel was produced.Utilizing metallographic microscope image analyzers and scanning electron microscopy(SEM),the effects of different oxygen contents on the formation of inclusions and effective inclusions were analyzed.Using metallographic microscopes,scanning electron microscopy,energy dispersive spectroscopy(EDS)and ImageJ software,the impact of inclusion size,quantity,composition,shape and austenite grain size on the formation of primary acicular ferrite was analyzed.The results show that when the inclusion sizes are less than 4μm,it is most conducive to inducing the formation of primary acicular ferrite.Within this range,the larger the effective inclusion size,the more acicular ferrite forms.Effective inclusions O-Ca-F-Mn-S,O-Si-Ca-V-Mn-S and O-Si-Ca-Ti-Mn-S have a strong ability to induce the formation of primary acicular ferrite.Coarse austenite grains facilitate the nucleation and growth of acicular ferrite within the grain on effective inclusions.Ultimately,the mechanism of preferentially precipitation of carbon in austenite on the surface of effective inclusions is revealed,forming C grain boundaries extending outward,with primary acicular ferrite preferentially nucleating and growing in the interstices of these C grain boundary of effective inclusions.
作者
杨蕾
胡奥翔
赵福才
习晓峰
YANG Lei;HU Aoxiang;ZHAO Fucai;XI Xiaofeng(College of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055 China;Shaanxi Longmen Iron&Steel Co.,Ltd.,Hancheng 715405,China)
出处
《热加工工艺》
北大核心
2025年第13期165-174,共10页
Hot Working Technology
基金
陕西省重点研发计划重点产业创新链(群)项目(2019ZDLG-Y04-04)
榆林市科技局产学研项目(2023-CXY-197)。
关键词
氧化物冶金生产技术
有效夹杂物
针状铁素体
奥氏体
oxide metallurgy production technology
effective inclusions
acicular ferrite
austenite
作者简介
杨蕾,女,工程师,硕士,研究方向:材料加工,E-mail:yanglei@xauat.edu.cn;通讯作者:赵福才,男,讲师,博士,研究方向:冶金工程,E-mail:zhaofucai@xauat.edu.cn。
