摘要
为研究火场中汽车外车身金属面板的受热痕迹特征,在对车身面板漆层进行热重分析的基础上,选择马弗炉对金属面板进行热辐射以模拟理想条件下的火场状况,研究辐射温度及时间对汽车外车身金属面板受热痕迹的影响。结果表明,当温度升高时,金属面板表面漆层逐渐脱落,面板出现氧化层,温度升至700℃时,表面漆层基本完全脱落;温度升至800~1000℃时,部分金属面板氧化层发生脱落,面板的两侧鼓起.整体较脆;温度升至800℃以上本体厚度及面板硬度下降较为明显;低温升至高温过程中微观形貌由铁素体逐渐转变为网状以及针状渗碳体,铁元素含量逐渐升高,碳元素含量逐渐降低,并趋于平稳。该研究结果有助于在现场调查时依据痕迹特征反推其在火场的受热状况,进而为汽车火灾调查中确定火势蔓延方向、起火部位以及起火点提供依据。
In order to study the characteristics of heat trace of car body metal panel in the fire,on the basis of thermal analysis of the car body panel paint layer,the muffle furnace was selected to simulate the ideal radiation condition of the fire,and the influence of radiation temperature on the heat trace of the car bodies metal panel was studied.The results show that when the temperature rises,the surface paint layer of the metal face plate gradually falls off,when the temperature rises to 700℃,the surface paint layer basically falls off completely.When the temperature rises to 800-1000℃,some of the oxide layers of the metal face plate fall off,and the two sides of the metal surface plate bulge up,the whole is more brittle.The microstructure gradually changes from ferrite to network and acicular cementite from low temperature to high temperature.The Fe content gradually increases,the carbon content gradually decreases and tends to be stable,the microstructure thickness and hardness gradually decrease,and the temperature increases to 800℃.The above research results provide a basis for determining the direction of fire spread,the location of fire and the point of fire origin in vehicle fire investigation.
作者
王鑫玉
赵禹忱
金静
周广英
WANG Xinyu;ZHAO Yuchen;JIN Jing;ZHOU Guangying(Graduate Department of People's Police University of China,Langfang 065000,China;College of Investigation,People's Police University of China,Langfang 065000;Daqing Fire Brigade,Daqing 163000,China)
出处
《热加工工艺》
北大核心
2022年第2期36-39,44,共5页
Hot Working Technology
基金
“十三五”国家科技基础性工作专项项目(SQ2015FY-3120051)
河北省重点研发计划项目(18215416)
国家自然科学基金项目(52001327)。
关键词
安全工程
火灾调查
痕迹识别
金属面板
微观形貌
硬度分析
safety engineering
fire investigation
trace recognition
metal panel
micromorphology
hardness analysis
