新型挤压轮钢4Cr3．75MoSiV的析出相对热疲劳性能的影响  

Effect of Precipitated Phases in New Steel 4Cr3.75MoSiV for Extrusion Wheel on Thermal Fatigue Behavior

作　　者：费阳[1] 刘宏玉[1,2] 汪圣锋[1] 万宝意[1] 林冲[1] 王红军[1] 

机构地区：[1]武汉科技大学理学院,武汉430065 [2]冶金工业过程系统科学湖北省重点实验室,武汉430065

出　　处：《特殊钢》2013年第6期49-51,共3页Special Steel

基　　金：湖北省教育厅高校产学研合作资助项目(C2010021)

摘　　要：开发的新型挤压轮用钢4Cr3.75MoSiV(/%:0.39C、0.95Si、0.35Mn、3.75Cr、1.25Mo、0.99V、0.009 5N)和常用挤压轮钢4Cr5MoSiV(/%:0.42C、1.20Si、0.38Mn、5.04Cr、1.14Mo、0.85V、0.035 0N)由10 kg真空感应炉熔炼,并锻成Φ18 mm试验用棒材,然后经880℃1 h+720℃1 h球化退火,1 080℃15 min油淬,550℃2 h+530℃2 h两次回火处理。研究了两种钢主要析出碳化物形貌、尺寸,析出比例和分布以及对500次600℃-室温连续热疲劳性能的影响。结果表明,含5.04%Cr的4Cr5MoSiV常用钢的析出物中V_4C_3+VC占12%,并有26%Cr_(33)C_6析出,而开发的4Cr3.75MoSiV新型钢中有利于提高热疲劳性能的析出物V_4C_3+VC占31%,未发现Cr_(33)C_6析出物;4Cr5MoSiV钢热疲劳损伤因子3.18×10^(-3),连续热疲劳试验表面裂纹比热疲劳损伤因子为1.77×10^(-3)的新型4Cr3.75MoSiV钢表面裂纹粗大。The developed new steel 4Cr3.75MoSiV for extrusion wheel （/% ： 0. 39C, 0. 95Si, 0. 35Mn, 3.75Cr, 1.25Mo, 0.99V, 0. 009 5N） and common steel 4CrSMoSiV for extrusion wheel （/% ： 0. 42C, 1.20Si, 0. 38Mn, 5.04Cr, 1.14Mo, 0. 85V, 0. 035 ON） are melted by a 10 kg vacuum induction furnace, and forged to φ18 mm bar for test, then 880.1 h ＋720 （2 1 h spheroidal annealing, 108 0 ℃ 15 min oil quenching, 550 ℃ 2 h ＋530 ℃ 2 h double tempering. The morphology, size, precipitates ratio and distribution of main carbide precipitates in both steels as well as the effect of precipitates on 500 times 600 ℃ -ambient continuous thermal fatigue behavior are studied. Results show that V4C3 ＋ VC a- mount to 12% of total precipitates and there is 26% Cr23C6 precipitate in common steel 4CrSMoSiV containing 5.04% Cr, while in developed new steel 4Cr3.75MoSiV the V4C3 ＋ VC, which are favourable to increase thermal fatigue behavior, a-mount to 31% of total precipitates and the Cr23C6 precipitate has not been found in new steel; after continuous thermal fatigue test the surface crack of steel 4CrSMoSiV with thermal fatigue factor 3.18 x 10-3 is coarser and larger than that of steel 4Cr3.75MoSiV with thermal fatigue factor 1.77 x 10-3

关 键 词：新型挤压轮钢4Cr3.75MoSiV 析出相 热疲劳性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]