Research Of Flaking And Its Fractography In A Wheel Steel

Acta Metall Sin

2006, Vol. 42

Issue (3): 273-279 DOI:

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Research Of Flaking And Its Fractography In A Wheel Steel

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. Research Of Flaking And Its Fractography In A Wheel Steel. Acta Metall Sin, 2006, 42(3): 273-279 .

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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.

Key words: flaking wheel steel fracture surface hydrogen-induced delayed cracking

Received: 21 June 2005

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