Al对1Cr9Al(1-3)Ni(1-7)WVNbB合金相变与性能的影响规律

为了研究Al对铁素体耐热钢相变与性能的影响规律，通过在已有合金T92的成分基础上进行Al元素的添加及改性添加剂Ni的调整制备出了新型高铝铁素体耐热钢，研究了不同含量Al元素的加入及热处理工艺下铁素体耐热钢相变温度与淬火组织晶粒尺寸、硬度及抗氧化性的关系。结果表明，实验钢的平衡相变点随着Al元素含量的增加而升高，且实验钢的奥氏体晶粒尺寸越大，Ac1和Ac3温度越高；钢中添加的Al、Ni元素总量在2.4 wt %时，淬火后的奥氏体晶粒尺寸最小，且硬度最大；在650 ℃环境下，钢中添加3 wt %Al比添加1 wt %Al的抗高温氧化性能强；在750 ℃环境下，钢中所含改性添加剂Ni起到了一定的作用，Al-Ni比越大，钢便表现出了较强的抗氧化性。

Effect of Al on Phase Transformation and Properties of 1Cr9Al(1-3)Ni(1-7)WVNbB Alloy

To study Al on the properties of ferritic heat resistant steel phase change and the influence law, a new type of high aluminium ferritic heat resistant steel was prepared by adding Al element and adjusting additive Ni on the basis of T92 alloy composition. The relationship of ferritic heat resistant steel phase change temperature under different Al contents and heat treatment processes and quenching organization grain size, hardness and oxidation resistance was studied. The results show that the equilibrium phase transition point of the experimental steel increases with the increase of Al content, and the Ac1 and Ac3 temperature of the experimental steel becomes higher with the austenite grain size becoming larger. When the total amount of Al and Ni elements added in steel is 2.4 wt %, the austenite after quenching grain size is the smallest and the hardness is the largest. Adding 3 wt % Al to steel at 650 °C is more resistant to high temperature oxidation than adding 1 wt % Al. At 750 °C, the modified additive Ni plays a certain role. The larger the Al-Ni ratio, the stronger the oxidation resistance of the steel.