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本文研究了两种基体组织状态及碳化物体积分数对高铬白口铸铁抗磨粒磨损耐磨性、断裂韧性K_(IC)、K_(Id)及亚临界裂纹扩展速率da/dN的影响。结果表明:高铬白口铸铁耐磨性与磨损系统有关;而其断裂韧性及亚临界裂纹扩展速率与基体组织状态、碳化物体积分数及其形态与分布有关。综合研究结果,从高铬白口铸铁耐磨性与断裂韧性最优化角度考虑,如果用软磨料,宜选用马氏体基体;采用硬磨料,则宜选用奥氏体基体。
In this paper, the effects of two kinds of matrix microstructure and carbide volume fraction on the wear resistance, wear resistance K_ (IC), K_ (Id) and da / dN of high Cr white cast iron were studied. The results show that the wear resistance of high chromium white cast iron is related to wear system, while its fracture toughness and subcritical crack growth rate are related to the matrix structure, carbide volume fraction and its morphology and distribution. According to the results of the research, considering the wear resistance and fracture toughness optimization of high-chromium white cast iron, martensite matrix should be used if soft abrasive is used, and austenite matrix should be used as hard abrasive.