Abstract Forming process of flaking in a wheel steel has been investigated. The cracking surface of the flacking is got using a special method, and is compared to various fracture surfaces of samples containing flaking. The results show that a cavity with H2, i.e. hydrogen blistering, forms and grows firstly, then microcracks initiate from the wall of the blistering, grow and connect each other resulting in formation of flaking. The cracking surface of flaking is a different idea with fracture surface of the sample containing flaking. The former is quasi-cleavage, similar to that of hydrogen-induced delayed cracking, but the later is dependent upon the failure method and the thickness of the sample. There is no effect of flaking in the steel on various fracture surface morphologies besides secondary cracks. Hydrogen-induced delayed failure is due to atomic hydrogen instead of flaking.
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LI Xiaowu; TIAN Jifeng; KANG Yan; WANG Zhongguang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1994-11-23; in revised form 1995-03-03). QUANTITATIVE ANALYSIS ON SURFACE ROUGHNESS OF FRACTURE[J]. 金属学报, 1995, 31(19): 311-317.
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