摘要
基于热模拟法模拟火灾条件下压力容器用钢板Q345R在550℃、700℃、750℃、800℃、850℃和900℃时,强制水冷和自然冷却时的组织和硬度变化。试验得知:<700℃时,Q345R的硬度值符合GB/T 35013—2018的要求;>700℃空冷时,随着温度升高,珠光体分解;硬度在700℃时突然变小,后随着温度的升高又逐渐升高后降低;850℃水冷时,全部转变为马氏体,随着马氏体的生成硬度升高。材料的力学性能与硬度存在一定的拟合关系,在工程中可以通过硬度测定快速评价材料的力学性能。
Based on the thermal simulation method,the microstructure and hardness changes of steel plate Q345 R for pressure vessel under fire conditions were simulated at 550℃,700℃,750℃,800℃,850℃and 900℃under forced water cooling and natural cooling.Test results show that the hardness of Q345 R meets the requirements of GB/T 35013—2018 when<700℃;when the temperature is higher than 700℃,the pearlite will decompose.Hardness suddenly decreases at 700℃,and then gradually increases and decreases with the increase of temperature;When water is cooled at 850℃,all of them are transformed into martensite,and the hardness increases with the formation of martensite.There is a certain fitting relation between the mechanical properties of materials and the hardness.In engineering,the mechanical properties of materials can be quickly evaluated by the hardness measurement.
作者
张巨银
王学平
张艺潇
ZHANG Ju-yin;WANG Xue-ping;ZHANG Yi-xiao(Gansu Province Special Equipment Inspection and Testing Institute,Lanzhou,Gansu,730050,China)
出处
《建材技术与应用》
2022年第6期25-28,共4页
Research and Application of Building Materials
基金
甘肃省市场监督管理局科技计划(SSCJG-TS-201905)。
关键词
热模拟试验
金相组织
力学性能
thermal modeling test
metallographic structure
mechanical property
