氮含量对0Cr16Ni5Mo马氏体不锈钢高温热变形行为影响

通过¹⁵N-¹⁴N同位素气体交换技术消除液相传质的影响，利用在线质谱分析仪测定了在1873 K下，铁液中氮溶解的界面反应速率常数。结果表明，总流量为600～800 mL·min⁻¹时可以忽略气相传质的影响，保护气中增加H₂的比例有利于降低钢液中杂质元素的浓度。铁液中加入一定量碳、铝、硅，分析得到这三种元素对氮溶解速率是抑制的。依据本实验的数据利用空位解离模型建立反应速率常数k_a与氧、硫、碳、铝、硅的活度关系，吸附系数分别是K_O=0.96，K_S=9.32，K_C=0.02，K_Al=0.51，K_Si=1.16。纯铁液中氮的溶解反应表观速率常数为k_a=4.8×10⁻⁶ mol·m⁻²·s·Pa。

Effect of nitrogen on planar anisotropy of the r-value and texture in lean duplex stainless steel sheets

Nitrogen in the steel can either improve or weaken the performance, as well as reduce product. In the flow of producing steel, it is of paramount importance to adopt some measures to restrain or promote nitrogen dissolution in controlling the nitrogen content in the final product. The dissolution of nitrogen into molten iron in 1873 K has been measured by ¹⁵N-¹⁴N isotope exchange technology and online mass spectrometer. The results show that 600−800 mL·min⁻¹ of gas flow rate removes the effect of gas transfer, and increasing the hydrogen content in shielding gas decreases the content of impurity element. A certain amount of C, Al or Si was added to the molten iron, and the three elements were inhibited from the nitrogen dissolution rate. Based on the values of the work and using the dissociation determining model, the reaction apparent rate constant, k_a, was built the relationship with the content of oxygen, sulfur, carbon, aluminum and silicon. The adsorption coefficients were calculated to be K_O=0.96, K_S=9.32, K_C=0.02, K_Al=0.51 and K_Si=1.16, respectively. The nitrogen dissolution reaction apparent rate constant in pure liquid iron is k_a=4.8×10⁻⁶ mol·m⁻²·s·Pa.