退火工艺对T4003高强度铁素体不锈钢组织和性能的影响  

Effect of annealing process on microstructure and properties of T4003 high strength ferritic stainless steel

作　　者：李志平[1] 王宏霞[1] 赵刚[1] 王俊海[1] Li Zhiping;Wang Hongxia;Zhao Gang;Wang Junhai(Shandong Taishan Iron and Steel Group Co.,Ltd.,Jinan Shandong 271100,China)

机构地区：[1]山东泰山钢铁集团有限公司,山东济南271100

出　　处：《金属热处理》2024年第1期198-201,共4页Heat Treatment of Metals

基　　金：2022年度山东省自然科学基金重大基础研究项目(ZR2022ZD12)。

摘　　要：在实验室利用箱式炉对T4003高强度铁素体不锈钢进行640~850℃的退火处理,通过光学显微镜、扫描电镜及拉伸试验等测试手段,对试验钢的组织和力学性能进行分析。结果表明,退火后基体组织均主要为铁素体和少量的细小碳化物颗粒;退火温度在640℃时,晶粒大小不均现象较明显;680~780℃退火时,仍有晶粒大小不均现象,但细小晶粒的数量随退火温度升高增多;830℃和850℃退火时,发生奥氏体相变,得到细小的再结晶晶粒。热轧态试验钢的强度高、塑性低;随着退火温度升高,强度呈先下降后上升的趋势,断后伸长率则呈先升高后下降的趋势。640℃退火时试验钢的屈服强度略低于高强度不锈钢的要求(R_(p0.2)≥350 MPa),其它退火温度下屈服强度均满足高强钢要求,可根据强度级别需求选择合理的退火温度。Microstructure and mechanical properties of the T4003 high strength ferritic stainless steel annealed at 640⁃850℃by using a box furnace in laboratory were analyzed by means of optical microscope,scanning electron microscope and tensile test.The results show that after annealing,the matrix is mainly composed of ferrite and a few fine carbide particles.When the annealing temperature is 640℃,the uneven grain size is obvious.When annealed at 680⁃780℃,the grain size is still uneven,but the number of fine grains increases with the increase of annealing temperature.When the annealing temperature is 830℃and 850℃,the austenite transformation occurs and fine recrystallized grains are obtained.The as⁃hot⁃rolled tested steel has high strength and low plasticity,while with the increase of annealing temperature,the strength shows a trend of first decreasing and then increasing,and the elongation after fracture shows a trend of first increasing and then decreasing.The yield strength of the tested steel annealed at 640℃is slightly lower than the requirement of high strength stainless steel(R_(p0.2)≥350 MPa),but that at other annealing temperatures meets the requirement.The reasonable annealing temperature can be selected according to the requirements of the strength level.

关 键 词：铁素体不锈钢 退火 显微组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]