热处理对高Co-Ni超高强度钢冲击断口的影响  

Effect of Heat-Treatment on Impact Fracture Surface of High Co-Ni Ultrahigh Strength Steel

作　　者：李杰[1] 王丽[1] 李志[1] 张景海[2] 颜鸣皋[1] 

机构地区：[1]北京航空材料研究院,北京100095 [2]宝山钢铁股份有限公司特殊钢分公司,上海200940

出　　处：《航空材料学报》2008年第1期35-39,共5页Journal of Aeronautical Materials

摘　　要：研究了不同固溶及回火温度对高Co-Ni超高强度钢23Co14Ni12Cr3Mo的Charpy V型缺口试样冲击功AKV和硬度HRC的影响,并用扫描电镜观察分析不同处理状态下的冲击断口形貌,用透射电镜对未溶碳化物进行了分析。结果表明,在850～930℃范围内固溶,随温度的提高,冲击功升高,硬度先升高后降低;在454～510℃范围内回火,随温度的提高,冲击功也增加,硬度降低。断口形貌观察结果表明,试验用钢冲击断口形貌均呈韧窝状,为韧性穿晶断裂,随固溶温度升高韧窝变大变深。韧窝中发现M23C6型碳化物颗粒,随固溶温度的升高而逐渐减少,提高固溶温度对改善试验用材料综合性能有利。The effect of solution and tempering temperature on the Charpy V impact energy Axv and HRC of ultra-high strength steel 23Co14Ni12Cr3Mo was studied, impact fracture surfaces were observed by SEM, and the undissolved carbide was analyzed by TEM. The results showed that in the range of 850 -930℃ for solution, impact energy Akv increased with increasing temperature, HRC reached a peak value and then drop, while Akv increased and HRC decreased with increasing temperature, when tempered at 454 - 510℃. Dimples were observed on the transgranular fracture surface, where existed M23C6 type carbide particles. The higher the solution temperature, the less the particles. Properties of this steel could be improved by increasing solution temperature.

关 键 词：热处理 高Co-Ni超高强度钢 冲击断口 扫描电镜分析 碳化物 

分 类 号：TG146.1[一般工业技术—材料科学与工程]