摘要
研究了新型低合金贝氏体钢辙叉正火和低温回火的组织及性能特性。实验结果表明,此种材料正火后的组织为贝氏体铁素体和残余奥氏体;不同炉次的抗拉强度为1 240～1 346 MPa;冲击韧度为76～94 J/cm2;伸长率为17%～20%;硬度为41.5～45 HRC。这种新型低合金贝氏体钢辙叉具有高强度和硬度,同时韧性也很好,具有良好的综合力学性能。能够满足辙叉心轨强度高、韧性好、易焊接等要求。
The microstructure and mechanical properties of a new kind of low alloy bainitic steel were studied after normalizing and low temperature tempering. The results show that the microstructure of bainitic steel after normalizing is a new kind of bainite which consists of bainite ferrite and retained austenite, and the mechanical properties of the bainitic steel is better than that of current premium rail steels： σb 1240-1346 MPa, αku 68-100 J/cm^2, 85 15%-20% and hardness 41.5-45 HRC. This bainitic steel has good tensile toughness, hardness and toughness, so they are applicable to make frog and rail.
出处
《热加工工艺》
CSCD
北大核心
2008年第2期25-27,共3页
Hot Working Technology
基金
四川省重点攻关项目(9831570)
2002年国家科技成果重点推广项目(2002EC000376)
关键词
贝氏体钢
辙叉
硬度
冲击强度
韧性
bainitic steel
switch-point component
hardness
impact strength
toughness
