微钛处理钢中的夹杂物特征及其对奥氏体晶粒尺寸和相变组织的影响  

Inclusion Characteristics and Its Effect on Austenite Grain Size and Transformed Microstructure in Ti-treated Steel

作　　者：杨浩 邵伟 曲锦波 YANG Hao;SHAO Wei;QU Jinbo(Institute of Research of Iron and Steel(IRIS),Sha-Steel,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《热加工工艺》2021年第7期48-51,共4页Hot Working Technology

摘　　要：利用扫描电镜和高温激光共聚焦显微镜研究了添加微量Ti对钢中氧化物夹杂、奥氏体晶粒尺寸及冷却组织转变的影响。试验结果表明,添加Ti后氧化物夹杂的种类、数量及尺寸均发生变化,夹杂物数目减少、尺寸减小,氧化物夹杂的主要合金元素由Mn-Al-Si转变为Ti-Mn-Al。添加少量Ti可明显抑制高温下的奥氏体晶粒长大,微钛处理钢的奥氏体粗化温度高于未经钛处理的钢。在奥氏体冷却转变过程中,未添加Ti的样品相变组织由多边形铁素体和上贝氏体组织,转变为添加Ti的样品相变组织则的晶界多边形铁素体和晶内针状铁素体。The effect of a small Ti addition on the oxide inclusions, size of austenite grain and cooling transformed microstructure were studied by means of scanning electron microscope(SEM) and laser scanning confocal microscope(LSCM) analysis. The results indicate that the type, number and size of oxide inclusions change after adding Ti, the number and size of inclusions become smaller, and the main alloy element of oxide inclusions changes from Mn-Al-Si to Ti-Mn-Al.The austenite grain growth at high temperatures is markedly hindered after adding a small amount of Ti and the severe coarsening temperature of Ti-treated steel is higher than that of Ti-free steel. During continuous cooling of austensite, the transformed microstructure is changed from polygonal ferrite and upper bainite of Ti-free steel to grain boundary polygonal ferrite and intragranular acicular ferrite of the Ti-treated steel.

关 键 词：氧化物冶金 Ti氧化物 奥氏体晶粒 针状铁素体 

分 类 号：TG244[金属学及工艺—铸造]