夹杂物体积分数和平均间距对高Co-Ni超高强度钢断裂韧度的影响  

Effect of Inclusion Volume Fraction and Average Spacing on Fracture Toughness of High Co-Ni Ultra-High Strength Steel

作　　者：郭峰[1] 李杰[1] 李志[1] 王俊丽[1] 古立新[1] 王瑞 

机构地区：[1]北京航空材料研究院,北京100095 [2]抚顺特殊钢股份有限公司,辽宁抚顺113001

出　　处：《航空材料学报》2008年第4期17-21,共5页Journal of Aeronautical Materials

摘　　要：微孔聚集延性断裂模式的高Co-Ni超高强度钢的断裂韧度受显微组织和夹杂物特征控制。影响断裂韧度的夹杂物特征包括夹杂物性质、大小、体积分数、平均间距和夹杂物抗空穴形核能力。在固定显微组织和夹杂物抗空穴形核能力因素的基础上,分析夹杂物体积分数f、夹杂物平均间距X0对临界裂纹尖端张开位移δIc的影响,得出高Co-Ni超高强度钢临界裂纹尖端张开位移与夹杂物体积分数f-1/3和平均间距X0呈线性关系。结果表明,减小夹杂物体积分数、增大夹杂物平均间距有利于高Co-Ni超高强度钢断裂韧度的改善。The fracture mode of high Co-Ni ultra-high strength steel belongs to the type of coalescence of voids. The fracture toughness of such steel was strongly affected by the following inclusion parameters： the nature of the inclusion, the size, the volume fraction, the average spacing among the inclusions, and the resistance to void nucleating. Suppose the microstructure and the resistance to the void nucleating were similar for different heats. The effects of the inclusion volume fraction f and the average spacing Xo on the critical crack tip opening displacement δIC of high Co-Ni ultra-high strength steel were estimated. The results showed that the relationship between the f ^-1/3 ,X0 and the δIC would be linear. In other words, such results dictated that as the volume fraction decreasing and the average spacing of the inclusion broadening, the fracture toughness of high Co-Ni ultra-high strength steel would be increasing.

关 键 词：高Co—Ni超高强度钢 夹杂物体积分数厂 夹杂物平均间距X0 临界裂纹尖端张开位移δIC 断裂韧度 

分 类 号：TG113[金属学及工艺—物理冶金] TG142.1[金属学及工艺—金属学]