准确识别火灾现场痕迹特征是客观认定火灾事故原因的前提，而研究现场痕迹特征规律及形成机理是火灾调查学科应用基础研究领域的重点。本项目选择管式炉和木垛火作为典型热源和火源，以火场中较为常见的Q235冷轧钢板为研究对象，系统研究这一金属材料在火灾现场连续经历火灾发展中的高温热蚀、灭火过程的冷却及常温锈蚀三个特殊阶段的痕迹演化过程，主要研究热释放速率、热蚀温度、高温烟气浓度及成分、冷却速率、冷却介质、常温过程温、湿度对火场中金属锈蚀痕迹形成过程的影响，特别是早期热蚀产物对后续常温下锈层演化的影响，采用形貌表征及表面分析技术相结合，探究火场金属痕迹特征规律及其形成机制，旨在通过模拟实际火灾现场条件，建立宏观痕迹特征与微观结构和成分、金属痕迹特征与其形成条件的关联性，为调查人员准确识别火灾现场金属痕迹及其形成条件提供理论指导，以进一步提高火灾事故调查的科学性和准确性.

Accurate identification of fire scene traces is the premise of fire investigation, and the characteristics and formation mechanism of fire scene traces are the critical issues in the basic applied research field of fire investigation. In this project, the Q235 steel sheet is taken as the research object due to the wide application in construction and vehicle, while the wood stacking fire and tubular furnace are selected as typical fire and heat sources. The trace evolution mechanism of this metal material in three typical stages of fire is systematically studies, heat corrosion at high temperature, cooling and quenching during fire extinguishing and corrosion at room temperature. And the impact of the following factors on the formation process of metal corrosion traces in fire, the influence of heat release rate, the thermal corrosion temperature, the flue gas with high concentration and temperature, cooling rate, cooling medium and temperature and humidity at room temperature and the effect of earlier corrosion products on the subsequent evolution of rust layer at room temperature, will be discussed specially. The characteristics and formation mechanism of metal trace in fire were characterized by color difference analysis, hardness test, morphology and surface component analysis. The purpose of this study is to establish the correlation between macroscopic trace characteristics, microcosmic structure and composition, metal trace characteristics and formation conditions by simulating actual fire scene conditions. The results of the paper will provide theoretical guidance for accurate identification of metal traces and formation conditions in fire scene, and further improve the scientificity and accuracy of fire investigation.