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1.序言铸铁与钢在材质方面的根本区别,就是铸铁由高C 及高Si 组成,组织中存在着石墨相。就石墨在铸铁中的任务及功过来说,虽然明确可使铸造性、衰减性、切削性、耐烧伤性及耐热冲击性等工艺性能得到提高,但对断裂而言,石墨相成为裂纹发生的起源点,该裂纹传播提供了优先的途径,故对强韧性来说成为致命的弱点。铸铁的强韧化在历史上已是多年的研究课题。至今,从石墨组织和基体组织的两面来看,许多的研究和努力都是重复的。其中,从球铁的强度和延展性接近钢的水平这一
1. Introduction The basic difference between cast iron and steel in terms of materials is that cast iron consists of high C and high Si with graphite phases in the organization. In terms of the tasks and merits of graphite in cast iron, although the processability such as castability, decay resistance, machinability, burn resistance and thermal shock resistance is clearly improved, the graphite phase becomes a crack in the case of rupture The origin of the crack propagation has provided a preferential way, it is a fatal weakness for the toughness. The toughness of cast iron has been a research topic for many years in history. To date, many studies and efforts have been repeated on both sides of graphite and matrix organizations. Among them, the strength and ductility from ductile iron close to the level of steel this one