单道次大变形冷轧及退火处理对2205双相不锈钢组织和性能的影响  

Effect of single pass large deformation cold rolling and annealing treatment on microstructure and properties of 2205 duplex stainless steel

作　　者：郭宇 陈吉[1] 杨美桐 Guo Yu;Chen Ji;Yang Meitong(School of Mechanical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China)

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《金属热处理》2021年第10期151-155,共5页Heat Treatment of Metals

摘　　要：采用微观组织观察、X射线衍射分析、显微硬度及动电位极化曲线测量,研究了单道次大变形冷轧及退火处理对2205双相不锈钢组织和性能的影响。结果表明,单道次大变形冷轧引起晶粒沿轧制方向被严重拉长并明显破碎形成纤维状组织及高密度位错塞积,使试验材料的硬度显著提升约1.5倍,同时晶粒细化使得自腐蚀电流密度相对原始态试样降低了2%,在3.5%NaCl溶液中的耐蚀性略微提高。冷轧态试样经500℃退火4 h后能使组织细化至约300 nm,耐蚀性明显提高,自腐蚀电流密度相对原始态降低了33%。当退火温度升高至700℃,位错在两相组织中湮灭程度不均匀,相界处会析出σ相,并使硬度进一步升高,但对耐蚀性不利,自腐蚀电流密度相对原始态下降了3%。Effects of single-pass cold rolling with large deformation and annealing treatment on microstructure and properties of the 2205 duplex stainless steel were studied by means of microscopic observation,X-ray diffraction,Vickers microhardness and potentiodynamic polarization curve measurement.The results show that due to the single-pass cold rolling with large deformation,severely elongated grains are significantly broken to form fibrous microstructure and high-density dislocations pile-up,which significantly increases the hardness of the tested material by about 1.5 times,and the self-corrosion current density is 2%lower than that of the original specimen due to the grain refinement,the corrosion resistance of which in 3.5%NaCl solution is slightly improved.The cold-rolled specimen annealed at 500℃for 4 h can refine the microstructure to about 300 nm,the corrosion resistance of which can significantly improve,and the self-corrosion current density reduces by 33%compared with original specimen.When the annealing temperature is increased to 700℃,the degree of dislocation annihilation in the two-phase microstructure is not uniform,theσphase will precipitate at the phase boundary,and the hardness will be further increased,but it is not good for the corrosion resistance,and the self-corrosion current density decreases by 3%compared with original specimen.

关 键 词：2205双相不锈钢 形变退火 硬度 耐蚀性 

分 类 号：TG174.3[金属学及工艺—金属表面处理]