High Temperature Brittleness of Non-Oriented Electrical Steel Containing Phosphrous

Abstract:

High temperature brittleness of non-oriented electrical steel containing 0.14wt% phosphorus was investigated by mechanical testing, scanning electrical microscopy (SEM) and Auger electron spectroscopy (AES). The steels were annealed at 800~950°C with hold time of 2~30min under dry hydrogen/nitrogen mixture and wet mixture gas. The mechanical testing results indicated that elongation and bend-to-failure times of steel sheets annealed in wet gas was decreased with hold time extending, and dramatically dropped when it exceeded some value. The critical time of brittleness was become shorter with increase of annealing temperature. It was shown by AES that the phosphorus segregation at grain boundary induced by decarbonizing under wet gas led to inter-granular brittle fracture in the steel sheets.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 350-355
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.350
• Online since: November 2011
• Authors: Ye Xian Ouyang, Jing Liu
• Keywords: Brittleness, Phosphorus, Segregation

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