硼元素对低碳高硫铋易切削钢热变形性能的影响  

Effect of B Element on Hot Deformation Property of Low-Carbon High-Sulfur Free Cutting Steel with Bi

作　　者：田安福 邢东阳 乔昱博 刘海涛 王维[1] 苌清华[1] TIANAnfu;XINGDongyang;QIAOYubo;LIUHaitao;WANGWei;CHANGQinghua(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Key Laboratory of Non-ferrous Materials Science&Processing Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023

出　　处：《热加工工艺》2025年第7期80-83,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51904090);河南科技大学博士科研启动基金资助项目(13480086);河南科技大学博士后科研启动基金资助项目(13554029);河南省青年人才托举工程项目(No.2021HYTP018)。

摘　　要：低碳高硫铋易切削钢在高温变形过程中极易产生变形裂纹。基于高温锻造与Gleeble热压缩实验,并结合SEM、EDS、EBSD等微观分析手段,研究了硼元素对低碳高硫铋易切削钢热变形性能的影响。结果表明:铋元素在热变形过程中易偏聚在晶界,降低晶界强度,导致低碳高硫铋易切削钢热变形裂纹的产生;硼元素可有效提高低碳高硫铋易切削钢的热变形性能,避免高温锻造裂纹的产生。硼元素对热变形性能的提高,一方面与硼元素的软化作用有关,使得热变形过程中钢基体易于变形;另一方面与硼元素可促使动态再结晶的发生,进而细化晶粒有关。Cracks are easy to occur in low-carbon high-sulfur free cutting steel with Bi during high temperature deformation.The effect of B element on the hot deformation property of low-carbon high-sulfur free cutting steel with Bi was studied by high temperature forging and hot compression tests on Gleeble machine.The effect mechanism of boron on the hot deformation property of the test steel was analyzed by SEM,EDS,EBSD and other microscopic analysis methods.The results show that Bi tends to segregate at the grain boundary during hot deformation,which reduces the strength of the grain boundary and leads to the cracks.B can effectively improve the hot deformation property of low-carbon high-sulfur free cutting steel with Bi and avoid high temperature forging cracks.On the one hand,the beneficial effect of B is related to the softening effect of B,which makes the steel matrix easy to deform during hot deformation.On the other hand,it is related to the fact that B can promote the occurrence of dynamic recrystallization and further refines the grains.

关 键 词：铋 硼 易切削钢 热变形性能 动态再结晶 

分 类 号：TG136[一般工业技术—材料科学与工程]