Discussion of the Metallographic Microstructure for Steel Plate SS41 after High Temperature by Using Replication Testing

• Main Authors: GUO,TING-YUAN, 郭庭源
• Other Authors: CHI,JEN-HAO
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/8qm3r3

碩士 === 吳鳳科技大學 === 消防研究所 === 106 === The study will focus on the steel (CNS SS41) that is being used in the majority of domestic small scale steel structure buildings. Conducting fire damage experiment under different temperature and cooling mode through using Metallographic Replication Analysis and fire-proof coating steel, we wanted to investigate the steel metallographic microstructure after natural cooling and water quenching. This will help us understand and categorize the changes of the microstructure of the steel and the fire resistance impact of the steel with and without fire proof coating. Also, to give future researchers and engineers an assessment and reference. Steel material is currently used in a high proportion of domestic buildings because of its high melting point of 1,530℃, and that the majority of steel products are larger in size, which means it is not as easy to be burn out completely in a fire. Furthermore due to its changes of appearance and structural changes from high temperature combustion, in the case of fire investigation, the steel can be used as an important reference to the fire spread. Therefore using non-destructive testing method, Metallographic Replication Analysis, to understand the changes of the microstructure, and the steel property and metallographic structure after heating and cooling, natural cooling and water quenching, we are able to further recognize the difference between the steel properties after fire damage. This study will give future researchers and engineers more understanding of such building structure, and be use as reference for fire safety and design for steel structure buildings.