氮对SAF2205双相不锈钢组织及力学性能的影响

通过增加氮质量分数、降低镍质量分数研究了对SAF2205双相不锈钢组织及力学性能的影响。结果表明,增氮降镍后,当氮质量分数和镍质量分数在合适的范围(w(N)≤0.26%、w(Ni)≥5.940%)内时,试验钢的奥氏体相区扩大,奥氏体晶粒变小且均匀;随着镍质量分数降低,晶粒变得粗大,但冲击吸收功和强度均有所提升,其中A_(kV)由199.7增至232.5J,R_m由538提高到787 MPa,Rp0.2由484提升到692 MPa,此时钢的塑性指标降低较小。

Influence of nitrogen on structure and mechanical property of SAF2205 duplex stainless steel

The effect on the structure and mechanical property of SAF2205 duplex stainless steel were studied by increasing the nitrogen mass fraction and reducing the nickel mass fraction. The results showed that after increasing the nitrogen mass fraction and reducing the nickel mass fraction, the Austenite phase of trial steel was enlarged when the nitrogen mass fraction and nickel mass fraction were in the suitable range, and the Austenite crystal grains became smaller and homogeneous. With the decrease of the nickel mass fraction, the Austenite crystal grains became thicker and bigger, while the impact absorbing energy and intensity were both improved, and AkV was increased from 199.7 to 232.5 J, Rm and Rp0.2 were increased from 538 to 787 MPa and from 484 to 692 MPa, respectiviely, which indicated that the plastic index of steel had a slight decrease.