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Acta Metall Sin  1986, Vol. 22 Issue (1): 79-149    DOI:
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THE CHART OF FATIGUE CRACK PROPAGATION MECHANISM FOR NODULAR GRAPHITE CAST IRON
HU Zhizhong; GUO Dazhan; AN Renje (Xi'an Jiaotong University)
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HU Zhizhong; GUO Dazhan; AN Renje (Xi'an Jiaotong University). THE CHART OF FATIGUE CRACK PROPAGATION MECHANISM FOR NODULAR GRAPHITE CAST IRON. Acta Metall Sin, 1986, 22(1): 79-149.

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Abstract  The fatigue crack propagation mechanism (FCPM) in the nodular graphite cast iron of different microstructures with various proportions of pearlite and ferrite at distinct ΔK levels has been studied by SEM so as to construct their own FCPM charts. The FCPM of the ferritic nodular cast iron is shown to be: transgranular and intergranular fracture→striation and intergranular fracture→striation→striation and dimple rupture; that of pearlitic one to be: transgranular fracture and striation→striation and cleavage fracture; and that of one containing bull's eye ferrite to be: transgranular and intergranular fracture→striation and intergranular fracture→striation and dimple rupture. The correlation between the transition of FCPM and structure or properties as well as the reason why the highest percentage of intergranular fracture observed in the nodular cast iron with 60% ferrite have also been discussed.
Received:  18 January 1986     
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