钙处理钛合金化钢中TiN析出行为

发布时间：2018-05-17 17:41

本文选题：钛合金化 + 钙处理　；参考：《钢铁研究学报》2017年12期

【摘要】：采用扫描电镜/能谱仪表征高强度结构钢中夹杂物的特征,考察了钛合金化及钙处理对钢中夹杂物组成的影响,探讨了氧化物对TiN析出行为及其对微观组织的影响。结果表明,钛合金化后钢中的夹杂物多为球形或多边形的Al-Ti-Mg-O系,钙处理能有效球化钢中的夹杂物和还原夹杂物中的TiOx,还原的Ti逐渐向夹杂物表层扩散积聚,促进了TiN在复合氧化物表面局部析出。钢中细小氧化物及氮化物的数量随Ti含量增加而增加,因此,钙处理较高Ti含量钢有助于促进细小的复合氧化物+TiN夹杂物的形成,并延迟凝固过程中TiN均质形核时间,细化TiN颗粒的尺寸。2~3μm的TiN不仅能诱导多边形铁素体析出,也能诱导针状铁素体析出。TiN及MnS在复合氧化物表面局部析出有助于互锁的针状铁素体诱导析出。
[Abstract]:The characteristics of inclusions in high strength structural steel were characterized by SEM / EDS. The effects of titanium alloying and calcium treatment on the composition of inclusions in steel were investigated. The effect of oxides on the precipitation behavior of TiN and its microstructure was discussed. The results show that most of the inclusions in titanium alloyed steel are spherical or polygonal Al-Ti-Mg-O system. Calcium treatment can effectively reduce the inclusion in the spheroidized steel and the reduced inclusion, and the reduced Ti gradually diffuses and accumulates to the surface layer of the inclusions. The local precipitation of TiN on the surface of composite oxide was promoted. The amount of fine oxides and nitrides in steel increases with the increase of Ti content. Therefore, high Ti content steel treated with calcium can promote the formation of TiN inclusions of fine composite oxides and delay the nucleation time of TiN homogenization during solidification. TiN, which refines the size of TiN particles at 3 渭 m, can not only induce polygonal ferrite precipitation, but also acicular ferrite precipitation. Tin and MnS can induce acicular ferrite precipitate on the surface of composite oxides, which is helpful for interlocking acicular ferrite precipitation.
【作者单位】：武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室;
【基金】：国家自然科学基金资助项目(51541409)
【分类号】：TG142.1

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