目前我国苛刻环境条件下高速车轴、转向架构架及车体用钢的运行状况、失效形式和失效规律的研究刚刚起步，可靠性试验技术和评价方法还有待完善，服役性能评价还没有统一的规范。同时，随着高速铁路和重载货车技术关键部件用钢的国产化，尤其是我国实际线路的苛刻环境条件下，其材料和工艺与国外进口材料也有一定程度的差异。针对我国实际运行情况和铁路车辆关键部件用钢的特点进行疲劳可靠性和耐蚀性试验，形成自己的试验规范，并在此基础上建立我国相应产品的评价方法，对构建完全自主知识产权的标准体系和保障铁路列车运行安全，具有重要的经济效益和社会效益。

按照课题任务书要求，本课题完成了高铁车轴疲劳性能的主要影响因素研究，开展了试验台试验研究，获得了动车组服役载荷下实物轮轴的疲劳性能数据，进行了疲劳可靠性评价；建立了转向架构架及车体用钢腐蚀动力学方程以及腐蚀寿命评价模型，客观预测了转向架构架及车体用钢服役寿命，将为服役安全性能评价提供理论和方法支持。通过本课题的试验研究，建立了适合我国铁路高速铁路与货车运行状况的关键部件用钢材料性能的综合评价方法；提出了三个钢种相应的行业应用技术条件或规范，以期推进我国铁道车辆的轻量化与长寿命化，从而提高运输效率与社会经济效益。发表学术期刊论文12篇，申请并授权实用新型专利2项，申请并授权发明专利2项，组织制定并发布实施冶金行业标准1项、铁路总公司标准1项，完成总公司标准送审稿1项，完成铁道行业标准征求意见稿1项、总公司标准征求意见稿1项，圆满完成了课题任务书规定的全部研究内容。

通过课题研究工作的开展实施，实现了我国铁路关键部件用钢的自主化研发，有力地保障了我国铁路机车车辆的运营安全、优化了铁路检修资源配置，同时也有效解决了我国铁路机车车辆关键部件可能出现的“卡脖子”风险，推动了我国铁路技术装备的自主创新。

At present, the research on the operation status, failure form and failure law of high-speed axle, bogie frame and car body steel under harsh environmental conditions in China has just started, the reliability test technology and evaluation method need to be improved, and there is no unified specification for service performance evaluation. At the same time, with the localization of steel for key technical components of high-speed railway and heavy haul truck, especially under the harsh environmental conditions of China's actual line, its materials and processes are also different from foreign imported materials to a certain extent. According to the actual operation situation in China and the characteristics of steel for key parts of railway vehicles, fatigue reliability and corrosion resistance tests are carried out to form their own test specifications, and on this basis, the evaluation methods of corresponding products in China are established, which has important economic and social benefits for building a standard system with completely independent intellectual property rights and ensuring the operation safety of railway trains.

 According to the requirements of the task book, this subject has completed the research on the main influencing factors of the fatigue performance of high-speed railway axle, carried out the test-bed test research, obtained the fatigue performance data of the physical axle under the service load of EMU, and carried out the fatigue reliability evaluation; The corrosion dynamic equation and corrosion life evaluation model of steel for bogie frame and car body are established, and the service life of steel for bogie frame and car body is objectively predicted, which will provide theoretical and methodological support for service safety performance evaluation. Through the experimental research of this subject, a comprehensive evaluation method for the properties of steel materials for key components suitable for the operation of high-speed railway and freight cars in China is established; The corresponding industrial application technical conditions or specifications of three steel grades are put forward in order to promote the lightweight and long service life of railway vehicles in China, so as to improve the transportation efficiency and social and economic benefits.