淬、回火参数对250mm×250mm EA4T高速动车轴用钢组织和性能的影响  

Effect of Quenching and Tempering Parameters on Structure and Properties of 250 mm ×250 mm Square Bloom of Steel EA4T for High Speed Strain Axle

作　　者：王之香[1] 王玉玲[1] 邬中华[1] 

机构地区：[1]山西太钢不锈钢股份有限公司技术中心,太原030003

出　　处：《特殊钢》2015年第3期67-69,共3页Special Steel

基　　金：山西省科技重大专项资助(20111101028)

摘　　要：试验用250 mm×250 mm方坯EA4T车轴用钢（/%：0.23C,0.32Si,0.70Mn,0.014P,0.010S,0.18Mo,0.03V）的生产流程为60 t EBT EAF-LF-VD-8.4 t铸锭轧制-退火工艺。试验研究了880920℃油淬、600650℃回火工艺对该钢组织和力学性能的影响。经920 C＋600℃、920℃＋650℃和880℃＋640℃淬-回火处理后,该钢的组织分别为马氏体、索氏体＋马氏体和马氏体＋贝氏体;880℃＋640℃淬-回火处理后EA4T钢的力学性能为Rp0.2525 MPa,Rm 720 MPa,A5 23%,U-5 mm纵向冲击功6882 J,横向冲击功6586 J,其组织和力学性能均符合EN13261标准要求。The production flowsheet for test 250 mm x 250 mm square bloom of EA4 T steel for axle（/%：0.23 C,0.32 Si,0.70 Mn,0.014 P,0.010 S,0.18 Mo,0.03V） is 60 t EBT EAF- LF- VD- 8.4 t ingot casting- rolling- annealing process.The effect of 880 920 ℃ oil quenching and 600 650 ℃ tempering process on structure and mechanical properties of the steel is tested and studied.With 920 ℃ ＋600 ℃,920 ℃ ＋650 X and 880 ℃ ＋640 ℃ quenching-tempering treatment,the structure of steel is respectively martensite,sorbite ＋ martensite and martensite ＋bainite;the mechanical properties of steel EA4 T treated by 880 ℃ ＋640 ℃ quenching-tempering process are Rp0.2- 525 MPa,Rm- 720 MPa,A5-23%,U-5 mm longitudinal impact energy- 6882 J and cross-sectional impact energy- 65 86 J,and its structure and mechanical properties all meet the requirement of standard EN13261.

关 键 词：250 mm×250 mm方坯 EA4T车轴用钢 淬-回火处理 组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理] TG142.1[金属学及工艺—金属学]