热变形工艺对铈-硫易切削不锈钢中硫化物形态演变的影响  

Influence of thermal deformation process on morphology evolution of sulfide in cerium-sulfur containing free-cutting stainless steel

作　　者：王英虎 郑淮北 宋令玺 刘庭耀 Wang Yinghu;Zheng Huaibei;Song Lingxi;Liu Tingyao(Chengdu Advanced Metal Material Industry Technology Research Institute Co.,Ltd.,Chengdu Sichuan 610000,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Liaoning 114009,China;National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]成都先进金属材料产业技术研究院股份有限公司,四川成都610000 [2]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [3]北京科技大学国家材料服役安全科学中心,北京100083

出　　处：《金属热处理》2022年第10期99-106,共8页Heat Treatment of Metals

摘　　要：使用Gleeble-3500热模拟试验机、光学显微镜及Phenom Partical X扫描电镜能谱仪研究了热变形工艺对铈-硫易切削不锈钢中硫化物形态演变的影响。铈-硫易切削不锈钢铸坯中的硫化物呈球形、椭球形、纺锤形或短棒状并以簇状形式沿晶界分布,属于第Ⅱ类硫化物。在800~1100℃温度范围内,随着变形量的增加,硫化物的分布密度逐渐增加,平均面积逐渐减小。在800~1000℃温度范围内,随着变形量从10%增加到70%,长宽比≤3的硫化物所占比例逐渐减小,当变形温度为1100℃并且变形量增加到70%时,长宽比≤3的硫化物所占比例又略有增加,硫化物发生熔断或重新形核。在10%~70%变形范围内,硫化物的相对塑性升高,在30%变形量达到峰值后又逐渐降低。在800~1100℃温度范围内,当变形量不变时,硫化物的相对塑性随变形温度的增加而降低。高温大变形更容易得到均匀弥散细小的硫化物。Influence of thermal deformation process on morphology evolution of sulfide in cerium-sulfur containing free-cutting stainless steel was studied by means of Gleeble-3500, OM and Phenom Partical X SEM-EDS. The sulfides in cerium-sulfur containing free-cutting stainless steel casting billet are spherical, ellipsoidal, spindle shape or short-bar-like, and distributed in clusters along the grain boundary, belonging to a type II sulfide. At the temperature ranging from 800 ℃ to 1100 ℃, the distribution density of sulfide increases and the average area decreases with the increase of deformation. At the temperature ranging amount from 800 ℃ to 1000 ℃, the proportion of sulfide with length-width ratio≤3 gradually decreases with the increase of deformation amount from 10% to 70%. When the deformation temperature is 1100 ℃ and the deformation increases to 70%, the proportion of sulfide with length-width ratio≤3 increases slightly, and the sulfide melts or re-nucleates. When the deformation amount is in the range of 10%-70%, the relative plasticity of sulfide increases and then decreases gradually after reaching the peak value at 30% deformation. At the temperature ranging from 800 ℃ to 1100 ℃, the relative plasticity of sulfide decreases with the increase of deformation temperature when the deformation amount is constant.It is easier to obtain uniformly dispersed fine sulfide at high temperature and large deformation.

关 键 词：热变形工艺 易切削不锈钢 硫化物 长宽比 相对塑性 

分 类 号：TG142.7[一般工业技术—材料科学与工程]