不同热处理热轧搪瓷钢含钛析出相的定性定量分析  

Qualitative and quantitative analysis of titanium precipitate phases in hot rolled enamel steel with different isothermal situation

作　　者：缪乐德[1] 张毅[1] 王双成[1] MIAO Lede;ZHANG Yi;WANG Shuangcheng(Central Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《冶金分析》2024年第3期1-7,共7页Metallurgical Analysis

摘　　要：热轧搪瓷用钢要求具备良好的抗鳞爆性能,要提高贮氢性能即增加氢陷阱,最有效的方法是增加钢中析出相的含量。为了对不同热处理的热轧搪瓷钢的析出相进行定量分析,本文采用电解提取方法将析出相从基体中分离,通过扫描电镜(SEM)和X射线衍射(XRD)定性研究了提取后析出相的形貌以及结构的变化过程;并利用Rietveld全谱拟合法计算不同析出相的组成及含量。同时采用透射电镜(TEM)和三维原子探针(3DAP)对纳米级析出相进行了表征。最后,探讨了热轧搪瓷钢中析出相与贮氢性能的关系。结果表明,通过XRD检测,热轧搪瓷钢中的析出相主要为Ti_(2)CS、TiC_(0.95)和TiC_(0.3)N_(0.7);透射电镜显示150 nm以上粗大析出物含有硫,为碳硫化钛,100 nm左右的碳化钛,以及10 nm级的大量析出,且分布不均匀,3DAP确认其为碳化钛。850℃热处理的试样析出相的含量(质量分数,下同)最高,达到了0.39%,颗粒比表面积最大,氢穿透实验显示其平均穿透时间最长,有更高的贮氢性能。Hot rolled enamel steels are required to have sufficient fish-scale resistance.Improving the hydrogen storage property,that is,increasing the hydrogen trap,the most effective method is to increase the content of precipitated phase in the steel.In this paper,in order to quantitatively analyze the precipitates of hot-rolled enamel steels with different aging treatments,the precipitates are separated from the matrix by electrolysis extraction method.The morphology and structure of the precipitates after extraction are characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD).Rietveld full spectrum fitting method is used to calculate the composition and content of different precipitates.The nano-scale precipitates are characterized by transmission electron microscopy(TEM)and three dimensional atomic probe(3DAP).Finally,the relationship between precipitate phase and hydrogen storage property in hot rolled enamel steel is discussed.The XRD results show that the main kinds of precipitate in hot-rolled enamel steel are Ti_(2)CS,TiC_(0.95)and TiC_(0.3)N_(0.7).TEM results show that the precipitates with diameter above 150 nm contain sulfur,which are carbon sulfide titanium.Precipitates with diameter about 100 nm are titanium carbide,and a large amount of precipitation with diameter about 10 nm,with disordered distribution,which are confirmed as titanium carbide by 3DAP.The sample treated at 850℃has the highest precipitation content,reaching 0.39%,and the specific surface area of the particles is also the largest.The hydrogen penetration experiment shows that it has the longest average penetration time and higher hydrogen storage performance.

关 键 词：热轧搪瓷钢 析出相 热处理 电解 定性定量分析 

分 类 号：O658.6[理学—分析化学] TG335.11[理学—化学] TG142.15[金属学及工艺—金属压力加工]