Laboratory Experiments on Hydrogen Outgassing in Alloy (Cr-Si-V) and Standard C-Mn Rail Steels

Autor:	D. E. Parsons, D. M. Fegredo, V. S. Sastri
Rok vydání:	1989
Předmět:	Materials science Hydrogen Metallurgy Alloy Hydrogen molecule Metals and Alloys Liquid steel chemistry.chemical_element engineering.material Industrial and Manufacturing Engineering Isothermal process Outgassing Cracking chemistry engineering
Zdroj:	Canadian Metallurgical Quarterly. 28:67-74
ISSN:	1879-1395 0008-4433
DOI:	10.1179/cmq.1989.28.1.67
Popis:	Shatter cracks form in hot-rolled rail steels when hydrogen atoms diffuse into sinks, change to molecular hydrogen gas and exceed a critical pressure. Cracking can occur at temperatures below 200°C. Hydrogen degassing to “safe” levels, i.e. below the threshold concentration causing cracks, is achieved by vacuum degassing the liquid steel, or by slow controlled cooling of the hot-rolled rails in insulated tanks. However, cooling conditions found to be effective for relatively soft standard C-Mn rail steels have not proved entirely successful in preventing crack formation in harder alloy premium rails. A program of hydrogen outgassing experiments was carried out on alloy (Cr-Si-V) and standard C-Mn rails to develop a method of calculating cooling conditions to reduce known, high hydrogen concentrations to safe levels. Isothermal and controlled cooling experiments were carried out on hot-rolled plates that simulated the heads of rails. Estimates of the hydrogen trapped in sinks were obtained from oth...
Databáze:	OpenAIRE
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