摘要
通过拉伸、冲击、断裂韧性以及扫描电子显微镜(SEM)等试验方法,研究了碳含量和回火温度对高钴镍超高强度钢(13.4Co11.3Ni)组织和力学性能的影响。试验结果表明,随着钢中碳含量的增加,试验钢的强度和硬度逐渐提高;冲击功和断裂韧性都随之降低;同时随着碳含量的增加,冲击断口中韧窝所占的比例逐渐下降,并且逐渐由韧窝型断口向韧窝+准解理的混合型断口过渡。随着回火温度的升高,试验钢抗拉强度和冲击功随之逐渐提高,分别在454℃和510℃时达到峰值后,又逐渐下降。其硬度(HRC)随着回火温度的升高而逐渐降低。
In this thesis, by means of tensile, impact, fracture toughness tests and the scanning electron microscope (SEM), effects of carbon content and tempering temperature on the structure and mechanical properties of a high-cobalt and nickel ultra-high strength steel (13.4Co11.3Ni) was investigated. The results showed that the strength and hardness of the experimental steel gradually increased with the increase of carbon content, the impact energy and fracture toughness gradually decreased simultaneously. Proportion of dimples in the fracture was reduced and the type of impact fracture gradually changed from the dimples fracture to the dimples plus quasi-cleavage mix-fracture. With the tempering temperature rising, the tensile strength and impact energy of experimental steel gradually went up to the peak value at 454℃ and 510℃ respectively, and then went down. The hardness of experimental steel gradually declined with the tempering temperature rising.
出处
《天津冶金》
CAS
2008年第1期4-7,共4页
Tianjin Metallurgy
关键词
超高强度钢
回火
碳含量
力学性能
研究
ultra-high strength steel
tempering
carbon content
mechanical properties
investigate
