电力铁塔金具材料碳含量与组织和性能关系探讨  

Discussion on the relationship between carbon content and microstructure and properties of electric power tower fittings

作　　者：陈鹏 刘晓明[1] 李振荣[1] 韩少强 刘明 钟振前 CHEN Peng;LIU Xiaoming;LI Zhenrong;HAN Shaoqiang;LIU Ming;ZHONG Zhenqian(Inner Mongolia Power Research Institute,Huhhot 010020,China;NCS Testing Technology Co.,Ltd.,Beijing 100081,China)

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020 [2]钢研纳克检测技术股份有限公司,北京100081

出　　处：《冶金分析》2022年第3期84-89,共6页Metallurgical Analysis

基　　金：内蒙古电力(集团)有限责任公司科技项目(2020-32)。

摘　　要：通过对一系列不同成分板式金具工件和5炉不同碳含量实验钢力学性能检测和微观组织分析,研究了碳含量对电力铁塔金具用Q235B钢组织和力学性能的影响。Q235B材料强化作用取决于多种强化方式叠加产生复合作用,随着碳含量增加,铁素体基体中固溶强化作用逐渐增强;第二相即珠光体体积分数增加,其起到的强化作用增强。分析得出:随着碳含量增加,Q235B钢组织中珠光体含量增加,强度升高,韧塑性降低。碳含量(质量分数)小于0.068%时组织中珠光体含量少,材料强度降低。出于金具服役安全性考虑,电力铁塔金具用Q235B钢中碳含量在标准范围内应保证不低于0.068%,保证材料足够的强度。The effect of carbon content on the microstructure and mechanical properties of Q235B steel for electric power tower fittings was studied by mechanical properties test and microstructural observation of a series of hanging plate fittings with different compositions and five groups of test steels with different carbon contents.The strengthening effect of Q235B steel depended on the composite action of various strengthening methods.With the increase of carbon content,the solid solution strengthening effect in ferrite matrix was enhanced.With the increase of volume fraction of the second phase(i.e.,pearlite),the strengthening effect was enhanced.The following conclusions were obtained:the pearlite content in microstructure of Q235B steel increased with the increase of carbon content,leading to the increase of tensile strength but the decrease of plasticity and toughness.As the carbon content(mass fraction) was less than 0.068%,the pearlite content in the structure was low,and the strength of the material decreased.For the sake of service safety of electric power tower fittings,its carbon content in Q235B steel should not be less than 0.068% within the standard range to ensure the sufficient strength.

关 键 词：电力铁塔金具 Q235B钢 碳 珠光体 力学性能 组织 

分 类 号：TG115.213[金属学及工艺—物理冶金] TG113.25[金属学及工艺—金属学]