摘要
采用热膨胀法和末端淬火法研究了200~250 km/h自主化替代实验动车组车轴用Cr-Ni-Mo系合金钢连续冷却转变曲线和末端淬透性曲线,并根据实验结果,在已有末端淬透性数学模型的基础上,建立了实验钢的末端淬透性数学模型.实验结果表明：实验合金车轴钢Ac3温度为815℃,Ac1温度为760℃,Ms和Mf温度分别为356℃和215℃;当冷却速度低于1.5℃/s时,试样中即有先共析铁素体析出;实验钢末端淬透性硬度值从距淬火端面10~40 mm间随着距离的增加,硬度值单调降低明显;末端淬透性实验硬度值与通过数学模型拟合的曲线吻合良好.
By adopting thermal expansion method and end quenching method,the continuous cooling transfor-mation curve and the Jominy hardenability curve of a Cr-Ni-Mo alloy steel for the axles of 200~250 km/h E-MUs were studied independently.According to the experimental results,the end quenching hardenability mathematical model for the test steel was established based on the existing Jominy test mathematical model. Results showed that the temperatures of Ac3 and Ac1 of this tested axle alloy steel used in high speed train were 815 ℃ and 760 ℃ respectively,while the temperatures of Ms and Mf were 356 ℃ and 215 ℃ separately.At the cooling rate of below 1 .5 ℃/s,proeutectoid ferrite appeared in the specimen.The hardness value of the end of the experimental steel decreased with the distance to the quenching end surface increasing from 10 mm to 40 mm.The hardness value of the Jominy test tallied with the curve from the mathematical model.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2016年第5期42-45,共4页
Journal of the China Railway Society
基金
铁道部科技研究开发计划(2012J005-I)
关键词
动车组车轴
合金钢
CCT曲线
淬透性
组织
high speed train axle
alloy steel
CCT curvet hardenability
microstructure
