国产高速重载列车车轴用钢EA4T的回火脆性  

Temper Brittleness of Domestic High Speed and Over Loaded Trains Axle Steel EA4T

作　　者：雷旻[1,2] 康利梅[1] 邹静[1] 梁益龙[1,2] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550003 [2]贵州省材料结构与强度重点实验室,贵州贵阳550003

出　　处：《热加工工艺》2011年第16期151-153,共3页Hot Working Technology

基　　金：科技部<科技人员服务企业行动项目>资助项目(2009GJF20026)

摘　　要：对EA4T钢进行高温系列回火冲击试验,并对其回火脆性进行了研究。结果表明:EA4T钢在550℃回火时出现冲击功低谷,表现出回火脆性,断口表现为准解理断裂;TEM和DSC研究表明:碳化物在马氏体板条束间的析出可能是EA4T钢550℃回火时冲击功出现低谷的重要原因。A series of tempering impact tests were carded out on steel EA4T, and the temper brittleness of EA4T steel was performed. The experiment results show that the bottom impact toughness appeares when steel EA4T is tempered at 330℃, and which has temper brittleness; the fi＇acture performance is quasi-cleavage fracture. The researches on TEM and DSC show that the cause of the bottom impact toughness value appearance at 550℃ is much to carbide precipitation between martensite attrib wattle beams.

关 键 词：EA4T钢 回火脆性 准解理断裂 马氏体板条束 TEM DSC 

分 类 号：TG156.5[金属学及工艺—热处理]