铁路钢梁桥调平垫片多元共渗工艺与渗层截面形貌及拉伸性能关系研究  

Research of the Relationship Between Sectional Microstructure and Tensile Properties of Multi-element Penetration Layer of Leveling Gasket for Railway Steel Beam Bridge

作　　者：张敏敏 马龙 孙福坤 王旭华 闫利明 丁增强 杨欣妍 李文博 张丰 朱法勇 吕晨 ZHANG Minmin;MA Long;SUN Fukun;WANG Xuhua;YAN Liming;DING Zengqiang;YANG Xinyan;LI Wenbo;ZHANG Feng;ZHU Fayong;LYU Chen(China Railway Jinan Group Co.,Ltd.,Jinan Shandong 250001,China;China Railway Beijing Group Co.,Ltd.,Beijing 100089,China;China Railway Shanghai Group Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]中国铁路济南局集团有限公司,济南250001 [2]中国铁路北京局集团有限公司,北京100089 [3]中国铁路上海局集团有限公司,上海200070

出　　处：《高速铁路新材料》2023年第5期54-58,共5页Advanced Materials of High Speed Railway

基　　金：中国铁路济南局集团有限公司科技研究开发计划项目(2022G11)。

摘　　要：采用多元共渗技术对铁路钢梁调平垫片进行表面改性处理,研究铁路钢梁调平垫片在不同多元共渗工艺参数下截面形貌特征及其与拉伸性能的关系。结果表明:共渗试样在不同工艺参数下截面形貌特征与共渗温度有关。在620~640℃存在临界温度,临界温度以上生成由氧化物层、化合物层组成的2层结构;临界温度以下生成由氧化物层、化合物层及扩散层组成的3层结构。其中2层结构组织较3层结构更为均匀致密,连续性更好,3层结构中扩散层较化合物层结构致密,裂纹孔洞较少。3层结构抗拉强度最高为664 MPa,2层结构抗拉强度最高为596 MPa;3层试样延伸率最高为27.7%,2层结构延伸率最高为21.2%,均较基体有所下降。In order to study the sectional microstructure characteristics and its relationship with tensile properties of levelling gaskets for railway steel beam bridge under different process parameters,the surface modification treatment of the samples was carried out.The results show that the sectional microstructure of the samples under different process parameters are related to the penetration temperature.There is a critical temperature between 620℃and 640℃.Above the critical temperature,a two-layer structure composed of oxide layer and compound layer is formed,and below the critical temperature,a three-layer structure composed of oxide layer,compound layer and diffusion layer is formed. The structure of the two-layer structure is more uniform and dense than that of the three-layerstructure, and the compound layer in the three-layer structure is denser than that of the diffusion layer,with fewer cracks and holes. The tensile strength of the three-layer structure is 664 MPa, the tensilestrength of the two-layer structure is 596 MPa, the elongation of the two-layer structure is 21. 2%, and theelongation of the three-layer sample is 27. 7%, both of which are lower than that of the matrix.

关 键 词：多元共渗 铁路钢梁桥调平垫片 截面结构 拉伸性能 

分 类 号：TG448.13[金属学及工艺—焊接] TG156.8