N含量对高性能输电铁塔钢组织和力学性能影响

材料热处理学报, 2015, 36(7): 74-80.

N含量对高性能输电铁塔钢组织和力学性能影响

黄耀 ^1, , 赵爱民 ^2, , 杨靖波 ^3, , 王旭明 ^4, , 韩军科 ^5, , 党会学 ^6,

1.中国电力科学研究院,北京100192;北京科技大学冶金工程研究院,北京100083;现代交通金属材料与加工技术北京实验室,北京 100083

2.北京科技大学冶金工程研究院,北京100083;现代交通金属材料与加工技术北京实验室,北京 100083

3.中国电力科学研究院,北京,100192

4.中国电力科学研究院,北京,100192

5.中国电力科学研究院,北京,100192

6.中国电力科学研究院,北京,100192

基金项目: 中国高校博士点专项基金(20110006110007) 国家自然科学基金(51308519)

关键词： V(C,N) , 输电铁塔钢 , 析出强化 , 相间析出

Effect of N content on microstructure and mechanical properties of high performance construction steel for transmission tower

Keywords： V(C, N) , transmission tower steel , precipitation strengthening , interphase precipitation

利用光学显微镜和力学性能测试方法,研究了不同N含量下热轧结构钢组织和力学性能差异;同时采用透射电镜和化学物相分析的方法,观察和分析了析出相粒子的形态和分布情况.结果表明,对结构钢中增N可有效促进纳米碳化物的析出,从而制备出抗拉强度达815 MPa、总伸长率达23％的超高强输电铁塔钢;当N增加至4.2×10-4时并不明显降低冲击韧性,-40℃冲击条件下冲击功为33.3 J/mm2.N含量增加能明显促进V(C,N)的析出和析出物尺寸的细化,同时减小V(C,N)相间析出的排间距,提高1 ～10 nm粒子的体积分数,从而提供最强的析出沉淀强化作用,提高钢的力学性能.

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