含氮马氏体不锈钢氮含量控制的研究

主要研究了真空感应炉中的氮气分压对马氏体不锈钢含氮量的影响.采用气体保护在真空感应炉中加入氮化物与母材混合进行熔炼的方法，通过氩气、氮气、氩气和氮气混合气体分别作保护气体对马氏体不锈钢中氮元素收得率研究发现：提高马氏体不锈钢中含氮量的决定因素是氮元素的化学势(即炉内的氮气分压)而不是炉内的气体压力，从而推导出氮气分压和不锈钢熔体中氮的溶解度经验公式，计算值与实测值基本吻合，为制备含氮马氏体不锈钢控制氮含量提供理论依据.

Effect of nitrogen pressure on nitrogen content of nitrogen-contained martensitic stainless steel

The effect of the nitrogen pressure in vacuum induction melting furnace on nitrogen content of the martensitic stainless steel was investigated.The experimental materials were melted in vacuum induction melting furnace through using the nitride and master alloy and taking argon or nitrogen or mixed argon and nitrogen as the protective atmosphere.The measurement on absorptivity of nitrogen indicates that the effective factor influencing nitrogen content of the martensitic stainless steel is the chemical potential of nitrogen element not the gas pressure in the furnace.And thus,the empirical formula about nitrogen pressure and nitrogen solubility in the stainless steel melting is derived.It has been noted that the calculated nitrogen content is in good agreement with the measured one.Obviously,the present research can provide a reliable theoretical basis for controlling nitrogen content of martensitic stainless steel.