Morphology of Ti-Al Inclusions in Ultrapure Ferritic Stainless Steel
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摘要: 针对超纯铁素体不锈钢中存在的Ti-Al夹杂物进行研究,通过二维金相法和三维无水电解法来观察钢中的Ti-Al夹杂物,采用钨灯丝和场发射扫面电镜观察其形貌,并通过能谱仪分析其元素组成。结果表明,在进行Al脱氧之后的超纯铁素体不锈钢中会生成多种形态的氧化铝夹杂,这些脱氧产物会对之后的Ti合金化造成影响,生成局部钛含量过高的Ti-Al复合夹杂。通过经典热力学计算得出超纯铁素体不锈钢中TiN夹杂物的平衡曲线以及Ti-Al平衡曲线。计算表明,在试验温度和元素含量下,TiN的生成应该处于不利状态,但由于Ti、N元素的局部富集,会在脱氧产物的表面或者凝固过程中生成TiN。Abstract: In this paper,the Ti-Al inclusions in ultra-pure ferritic stainless steel were studied.The Ti-Al inclusions in steel were observed by two-dimensional metallographic method and three-dimensional anhydrous electrolysis.Tungsten filament and field emission scanning electron microscope were used to observethe morphology,and its elemental composition was analyzed by an energy spectrometer.The results show that various forms of alumina inclusions are formed in the ultra-pure ferritic stainless steel after Al deoxidation.These deoxidation products will affect the subsequent Ti alloying and form a Ti-Al composite with excessive local titanium content.The equilibrium curve of TiN inclusions and the Ti-Al equilibrium curve in ultrapure ferritic stainless steel were obtained by classical thermodynamic calculations.The calculations showed that the formation of TiN should be in an unfavorable state at the experimental temperature and elemental content,but due to the local enrichment of Ti and N elements,TiN formed during the deoxidation product indicating or solidification.
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