热处理工艺对12%Cr铁素体不锈钢组织性能的影响

Effect of Hot Treatment Process on Microstructure and Property of 12% Cr Ferritic Stainless Steel

以12%Cr铁素体不锈钢为研究对象,研究了不同退火方式、退火工艺对12%Cr铁素体不锈钢热轧板和冷轧板组织、力学性能、耐腐蚀性能、成形性能的影响。结果显示,12%Cr铁素体不锈钢高温下存在铁素体—奥氏体相变过程,在双相区退火快冷后有马氏体组织生成。通过在热退过程中引入奥氏体相变和马氏体相变,可以显著细化最终产品晶粒,提高最终冷轧产品的强度、硬度,同时保持材料耐腐蚀性能不变。该工艺生产的产品可以适用于高强度的应用场合,打破了传统12%Cr铁素体不锈钢热轧后只能采用罩式炉退火的束缚,针对产品的最终用途可以采用不同的退火方式和退火工艺进行生产。

The effect of different annealing methods and annealing processes on microstructure and mechanical prop-erty,corrosion resistance,for mabtlity of 12%Cr ferritic stainless steel was investigated in laboratory.The results show that ferrite will transit to austenite at high temperature and the austenite will transit to martensite by rapid cooling in 12%Cr ferritic stainless steel,so the annealing temperature has significant effect on the microstructure of material.Using the phase transition mechanism in hot annealing will refine the grain and increase the strength and hardness of the final product,while keep the corrosion resistance of the product unchanged.The product adopted this technology cab ne utilized in high-strength situations and has broken the tradition that only batch furnace annea-ling can be used after 12% Cr ferritic stainless steel hot rolling.Different annealing method and annealing process will be adopted according the application of final product.