钛设备火灾物证图痕形成机制及火灾重构研究

With more and wider application of titanium and titanium alloy in industry, the behavior of titanium in fire environment, especially the material evidence analysis of titanium equipment fires as well as the fire reconstruction issues, have been realized to be insufficient in terms of basic experimental data collection, theoretical model construction and numerical simulation. In this project, using titanium TA2 and TC4, etc. for chemical industry as the research objects, firstly the change rules of post-fire titanium scars under the influence of high temperature, heating rate, fire duration and cooling water are analyzed, and the extraction, identification and effective classification of them are also investigated. Secondly, through high temperature tensile test, impact test and bending test, the change rules of mechanical properties and microstructure of post-fire titanium are analyzed to establish a quantitative analytical relationships of "intrinsic fire behavior characteristics – extrinsic scar manifestations", which is a base to reveal the formation mechanism of post-fire titanium scars in complicated multi-parameter coupling environment. Finally, integrated with the experimental data and simulation, a kind of titanium equipment fire reconstruction method based on fire investigation and post-fire scars’ quantitative analysis is developed through the construction of some prediction models about fire point, fire duration and so on. This project focuses on the prominent problem of titanium equipment fires in industry, aiming to provide solid theoretical basis and experimental data for the fire prevention and control of titanium equipment in industry.

钛及钛合金在工业领域的应用日益广泛，但钛材在火灾环境下的行为表现，尤其是针对钛设备火灾的物证分析、火灾重构研究，无论是在基础实验、理论模型还是数值仿真方面，都十分欠缺。本项目立足于钛材在工业应用中面临火灾威胁的突出问题，以TA2、TC4等化工用钛材为研究对象，通过模拟火灾实验，分析温度、升温速率、火灾作用时间及消防冷却水等因素影响下的钛材受火后图痕变化规律，提取、辨识典型图痕特征并进行有效分类；通过高温拉伸、冲击、弯曲等实验分析钛材受火后的力学性能和微观组织变化规律，建立钛材“内在火行为特性-外在图痕表现”的定量解析关系，揭示钛材在复杂多参数耦合环境下受火后的图痕形成机制；最后结合实验数据和仿真模拟，构建钛设备火灾起火点、火灾作用时间等推断模型，发展基于火灾调查和物证图痕定量分析技术的钛设备火灾重构方法。从而为钛设备在工业领域的推广应用及事故防控提供坚实的理论依据和实验数据支撑。

化工设备中用到的钛材越来越多，对化工用钛材的过火后的力学性能以及微观组织研究具有重要意义。本项目重点研究钛材过火前后的力学性能和微观组织差异性变化，构建钛材和温度之间的关系。钛设备受火后的物证图痕与钛材力学性能、微观组织特性之间的定量表征关系，并通过系统分析火灾温度、升温速率、火灾作用时间及消防冷却水干扰等因素影响下的钛设备火灾后的特性，并通过结合实验和仿真模拟，对比分析钛材受温度等多工况耦合后的力学性能、微观组织、耐腐蚀性能表现。从而为钛设备在工业领域的推广应用以及事故防控提供坚实的理论依据和实验数据。在本项目的执行过程中，获取了大量的实验数据和微观组织图片，对充实基础材料的数据库有重要的补充。