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Corrosion crisis

Highways Agency investigations have detected intergranular corrosion and cracks propagating through the microscopic structure of the bearings' hardened stainless steel. A side effect of intergranular corrosion is the liberation of hydrogen. Highly hardened materials such as the failed rollers can be susceptible to stress corrosion and hydrogen embrittlement, says Dobson. The hardening properties of the stainless steel surface are generally imparted by quenching and then tempering to ...

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