Vanadium/Nitrogen Modification of 1% Cr and Cr-Cb Rail Steels

Autor:	J. Ng-Yelim, D. A. Munro, D. E. Parsons
Rok vydání:	1983
Předmět:	chemistry.chemical_classification Materials science Fracture toughness chemistry Base (chemistry) Metallurgy Metals and Alloys chemistry.chemical_element Tensile ductility Vanadium Microstructure Nitrogen Industrial and Manufacturing Engineering
Zdroj:	Canadian Metallurgical Quarterly. 22:475-483
ISSN:	1879-1395 0008-4433
DOI:	10.1179/cmq.1983.22.4.475
Popis:	The composition of two commercial rail steels (1% Cr and Cr-Cb) were modified by addition of vanadium and nitrogen. The microstructures and mechanical properties of the steels were determined. The results indicate that addition of 0.1% vanadium to the base compositions offers potential for a cost effective increase of YS at “normal” nitrogen contents, providing the tensile ductility, we1dability, and fracture toughness at − 50°C are proven acceptable by testing as-rolled rail sections. The results are compared with those for other types of high-strength steels intended for wear-resistant rail.Laboratory heats of the two base compositions were prepared with vanadium contents of 0.1 and 0.2 %, and a vanadium:nitrogen ratio of 10:1.Ingots were forged to 64 × 64 × 1200mm billets and were cooled at a rate that simulated commercial practice [1].The 0.1% vanadium addition increased the yield strength of both types of steel to 830MPa and increased the hardness to Rc 38 (from Rc 34). There was a correspon...
Databáze:	OpenAIRE
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