高铝低密度钢板带边裂成因分析及控制  

Cause analysis and control of edge crack of low density steel plate with high aluminum content

作　　者：章小峰 武学俊[1,2] 唐立志 万亚雄 黄贞益 ZHANG Xiaofeng;WU Xuejun;TANG Lizhi;WAN Yaxiong;HUANG Zhenyi(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243032,China;Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling(Anhui University of Technology),Ma'anshan 243032,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]冶金工程与资源综合利用安徽省重点实验室(安徽工业大学),安徽马鞍山243032

出　　处：《兵器材料科学与工程》2020年第5期11-15,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金(51674004)。

摘　　要：以高铝Fe-Mn-Al-C系低密度钢为对象研究热轧钢板边裂的形成原因。通过对不同成分低密度钢的相图计算,发现800~1 300℃主要为γ奥氏体+α铁素体两相区;700~800℃发生奥氏体共析转变,即γ→α+κ;低于700℃时,则是α铁素体和κ-碳化物两相共存。用XRD衍射仪、OM、SEM和能谱仪分析边裂部位组织构成,发现钢板边裂形成主要与奥氏体基体中κ-碳化物的有序析出密切相关,是钢中Al、Mn、C在γ奥氏体相中进行元素配分,Al作为κ-碳化物的形成元素,促进κ-碳化物在奥氏体晶界生成,加剧低密度钢板边裂程度。The cause of edge crack in hot rolled plate of Fe-Mn-Al-C series low density steel with high aluminum content was studied. Through the calculation of the phase diagram of low-density steel with different composition,it is found that the temperature range of 800-1 300 ℃ is mainly γ austenite+α ferrite two-phase region. The eutectoid transformation of austenite occurs at 700-800 ℃,i. e. γ→α + κ. When the temperature is lower than 700 ℃,α ferrite and κ-carbide coexist. By means of XRD,OM,SEM observation and energy spectrum analysis,it is found that the formation of edge crack is closely related to the ordered precipitation of κ-carbides in austenite matrix. It is the distribution of Al,Mn and C elements in γ austenite phase.As the forming element of κ-carbides,Al promotes the formation of κ-carbides in austenite grain boundary,which aggravates the edge crack degree of low density steel plate.

关 键 词：高铝 高锰 Fe-Mn-Al-C系低密度钢 热轧板边裂 κ-碳化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]