摘要
通过建立裂纹扩展的分形几何模型,计算了冲击断口的分形维数,研究了冲击韧性与易切削相参数的相关性。影响纵向冲击韧性的是易切削相的面积分数f,由于f?1,影响可以忽略不计;影响横向冲击韧性的是易节削相的形态分布,即长/宽,长/宽越小,横向冲击韧性越高,f?1亦可忽略不计,RE/S高的易切削钢,横向冲击韧性比低硫基础钢还高的原因就在于此。
Studies were made of the calculation of fractal dimension of transverse impact fracture surface, and of the correlation between impact toughness of steel and parameters of free-cutting phase by means of the developed fractal geometry model of crack propagation. It is believed that the area fraction f, of free--cutting phase is negligibly influential to the longitudinal impact toughness, as f《 1. While the configuration, saying ratio of length to width,
of free--cutting phase is inversely ?nfluential to the transverse impact toughness. This may be the reason why the transverse impaot toughness of free--cutting steel containing more rare earth contrast to sulphur is even higher than the low sulphur base steel.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第1期A027-A033,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
分形几何
冲击韧性
易切削相
fractal geometry
impact toughness
free-cutting phase
