摘要
为了探究Mo元素对搪瓷钢微观组织和性能的影响规律及作用机理,利用激光共聚焦显微镜、扫描电镜、电子万能试验机、双电解池氢渗透实验等手段研究了Mo元素加入前后搪瓷钢的微观组织、力学性能及抗鳞爆性能,并利用热力学计算和第一性原理计算阐明了Mo元素的微观作用机理。实验结果表明,Mo元素的加入细化了搪瓷钢基体的铁素体晶粒,增加了晶界及第二相析出的数量,提高了钢的细晶强化及第二相强化效果,增加了钢中氢陷阱的种类及数量。含Mo搪瓷钢退火板的屈服强度最高为447 MPa,抗拉强度为497 MPa,断后伸长率达到23%,抗鳞爆敏感性T_(H)值为31.3 min·mm^(-2),具有优良的力学性能、抗鳞爆性能及高温性能稳定性。计算结果表明,Mo元素的加入使搪瓷钢中析出了有较强捕氢能力的MoC粒子,提高了搪瓷钢的第二相强化效果及抗鳞爆性能。
To explore the influence law and action mechanism of Mo element on the microstructure and properties of enamel steel,the microstructure,mechanical properties and scale explosion resistance of enamel steel before and after the addition of Mo element were studied by means of laser confocal microscope,scanning electron microscope,electronic universal testing machine and double electrolytic cell hydrogen permeation experiment.The micro action mechanism of Mo element was clarified by thermodynamic calculation and the first-principles calculation.The experimental results show that the addition of Mo element refines the ferrite grain of enamel steel matrix,increases the number of grain boundary and the second phase precipitation,improves the effect of fine grain strengthening and the second phase strengthening,and increases the type and number of hydrogen traps in steel.The yield strength of Mo-containing enamel steel annealed sheet is up to 447 MPa,the tensile strength is 497 MPa,the elongation after fracture is 23%,and the scale explosion resistance sensitivity T_(H) value is 31.3 min·mm^(-2).It has excellent mechanical properties,scale explosion resistance and high temperature performance stability.The calculation results show that the addition of Mo element makes MoC particles with strong hydrogen capture ability precipitate in enamel steel,which improves the strengthening effect of the second phase and scale explosion resistance of enamel steel.
作者
袁静
陈飞达
钟海清
唐小勇
何春雨
朱映玉
冷烨旻
肖虎
田世伟
江海涛
YUAN Jing;CHEN Fei-da;ZHONG Hai-qing;TANG Xiao-yong;HE Chun-yu;ZHU Ying-yu;LENG Ye-min;XIAO Hu;TIAN Shi-wei;JIANG Hai-tao(Xinyu Iron and Steel Co.,Ltd.,Xinyu 338000,China;Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《塑性工程学报》
北大核心
2025年第2期236-244,共9页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(52201101
52274372)
国家重点研发计划(2021YFB3702404)。
关键词
搪瓷钢
退火温度
抗鳞爆性能
热力学计算
第一性原理计算
enamel steel
annealing temperature
scale explosion resistance
thermodynamic calculation
the first-principles calculation
