退火对冷轧022Cr18Ni8N亚稳奥氏体不锈钢性能与组织的影响  

Effect of annealing on properties and microstructure of cold-rolled 022Cr18Ni8N metastable austenitic stainless steel

作　　者：刘锦润 郎宇平[2] 陈海涛[2] 冯翰秋 高智君 张正富[1] Liu Jinrun;Lang Yuping;Chen Haitao;Feng Hanqiu;Gao Zhijun;Zhang Zhengfu(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《金属热处理》2024年第12期62-67,共6页Heat Treatment of Metals

摘　　要：以90%变形量的冷轧022Cr18Ni8N亚稳奥氏体不锈钢为研究对象,进行100~700℃×30 min的去应力退火处理,对冷轧态及不同温度退火试样开展室温拉伸试验,并借助XRD、TEM和纳米压痕仪探究试样显微组织变化。结果显示,该钢形变诱导马氏体逆转变温度在500~600℃之间。100~400℃退火时,试样抗拉和屈服强度较冷轧态提高,得益于退火过程溶质原子扩散阻碍位错运动以及马氏体含量增多,克服了位错密度降低的不利影响;500℃退火时,虽马氏体含量高于冷轧态及100~400℃退火态,但位错密度大幅降低主导强度变化,使强度低于前两者;600~700℃退火时,形变诱导马氏体逆转变致马氏体含量大幅下降,强度也大幅降低。The 022Cr18Ni8N metastable austenitic stainless steel with a 90%cold-rolling deformation was chosen as the research object.Stress-relief annealing treatments were conducted within the temperature range of 100-700℃for 30 min.Subsequently,room temperature tensile tests were carried out on both the cold-rolled specimens and those annealed at different temperatures.Additionally,the microstructural variations of the specimens were investigated by utilizing x-ray diffraction(XRD),transmission electron microscopy(TEM),and nano-indentation techniques.The results show that the reverse transformation temperature of deformation-induced martensite in the steel is within the range of 500-600℃.During the annealing process at 100-400℃,the tensile and yield strengths of the specimens are enhanced compared to the cold-rolled state.This improvement can be ascribed to the obstruction of dislocation motion caused by the diffusion of solute atoms during annealing,along with an increase in martensite content,which effectively offsets the negative effect of the decreased dislocation density.When annealed at 500℃,although the martensite content is higher than that in the cold-rolled state and the annealed states within 100-400℃,the significant reduction in dislocation density predominantly governs the strength variation,resulting in a lower strength compared to the former two conditions.When annealed within the temperature range of 600-700℃,the reverse transformation of deformation-induced martensite leads to a substantial decrease in martensite content,simultaneously causing a remarkable reduction in strength.

关 键 词：亚稳奥氏体不锈钢 退火 形变诱导马氏体 逆转变 

分 类 号：TG142.71[一般工业技术—材料科学与工程]