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| OBSERVATION OF THE FATIGUE FRACTURE SURFACE OF HIGH STRENGTH STEELS |
| Sun Fuyu;Liao Chienchu;Lan Fenlan;Liu Caimu;Liu Jianhua Central Iron and Steel Research Institute; Ministry of Metallurgical Industry |
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Cite this article:
Sun Fuyu;Liao Chienchu;Lan Fenlan;Liu Caimu;Liu Jianhua Central Iron and Steel Research Institute; Ministry of Metallurgical Industry. OBSERVATION OF THE FATIGUE FRACTURE SURFACE OF HIGH STRENGTH STEELS. Acta Metall Sin, 1980, 16(2): 140-251.
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Abstract The fatigue fracture surfaces in specimens of two high strength steels havebeen examined by SEM nd discussed in terms of the propagation rate curve(log da/dN vs logΔK) of fatigue cracking. The results btained are as follows: (1) Fracture surfaces corresponding to the lower growth-rate exhibit three dis-tinctive zones of different appearance, showing that the propagation of cracks inthis region consists f hree stages, i.e. crack initiation, crack propagation, and atransition stage which dominated by both ransgranular striation growth and in-tergranular fracturing mechanisms. (2) In the intermediate growth-rate egion the propagation of fatigue cracksprincipally takes place by a striation mechanism, though the triation space (S) doesnot coincide with the macrocrack propagation rate (da/dN). (3) In the high rowth-rate region the rate propagation of fatigue cracks isgoverned by the striation growth mechanism as ell as by the dimple mechanism.The interaction between these two mechanisms and the pattern of the growth fdimples have been investigated quantitatively.
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Received: 18 February 1980
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