低合金高强度贝氏体钢轨的试验研究  

Study on High Strength Low Alloy Bainitic Steel Rails

作　　者：陈朝阳[1] 周清跃[1] 张银花[1] 刘丰收[1] 陈昕[2] 

机构地区：[1]中国铁道科学研究院金属及化学研究所,北京100081 [2]鞍钢股份有限公司技术中心,辽宁鞍山114009

出　　处：《铁道学报》2013年第8期75-79,共5页Journal of the China Railway Society

摘　　要：根据我国铁路技术装备发展的需要,开展低合金高强度贝氏体钢轨的实验室研究及工业性试制、显微组织及性能试验研究、焊接性能及铺设使用研究。结果表明:贝氏体钢轨具有优良的强韧性配合,室温抗拉强度达到1 240MPa,断后伸长率15.3%,平均冲击功达到142J,-20℃断裂韧性KIC为48MPa.m1/2;钢轨全断面显微组织为无碳化物贝氏体;焊接性能研究结果表明:贝氏体钢轨具有良好的焊接性,其接触焊、气压焊和铝热焊接头的各项性能均达到我国铁路钢轨的铺设使用要求。试铺结果表明:贝氏体钢轨的耐磨性能与高强度热处理钢轨相当,抗接触疲劳伤损性能突出,综合使用性能优于珠光体型热处理钢轨及热轧钢轨。To meet the dramatic growth needs of China railways, the systematic research work of bainitic steel rails was conducted, including laboratory study, trial production, microstruture and properties study and weld- ing performance,laying operation study. The results show as follows： At room temperature, the average tensile strength, tensile elongation and CUN impact toughness of rail cross section reach respectively 1 240 MPa, 15.3% and 142 J;the fracture toughness （K1c） at --20 ~C was up to 48 MPa ~ m1/2 ; the microstructure of the whole rail section is carbon-free bainite;the bainitic rails possess good weldability,their performance with flash butt welding, gas pressure welding and thermit welding all satisfy requirements of laying and operation of rails of China railways;the bainitie rails have better spalling resistance and wear resistance than rolled and heat hardened pearlitic rails so that they provide better comprehensive operating characteristics.

关 键 词：钢轨 贝氏体钢轨 贝氏体钢 滚动接触疲劳 

分 类 号：U213.41[交通运输工程—道路与铁道工程]