Factors Affecting Texture Formation of Cu-precipitation Hardening Cold-rolled Steel Sheet

Masaya Morita; Kaoru Sato; Yoshihiro Hosoya

doi:10.2355/isijinternational.34.92

Masaya Morita, Kaoru Sato, Yoshihiro Hosoya

著者情報

キーワード: extra low carbon steel, interstitial-free (IF) steel, cold-rolled steel sheet, hot-coiling temperature, Cu-precipitation hardening, hot-band microstructure, Ti-carbonitride, Ti-carbosulfide, complex precipitate, r-value, electrical resistivity, recrystallization texture, γ-fiber texture, <100>//ND-fiber texture, Orientation Distribution Function (ODF), crystalline orientation distribution function.

ジャーナルフリー

1994 年 34 巻 1 号 p. 92-98

DOI https://doi.org/10.2355/isijinternational.34.92

詳細

抄録

The mechanism of improving r-value of continuously annealed steel sheets by high temperature hot-coiling in Cu-bearing ultra low C interstitial-free (IF) steel has been investigated, by using the hot-bands heat-treated at different temperatures from 500 to 800°C in order to change the morphology of pre-precipitates in hot-bands. By the ODF analysis of recrystallization texture, it was clarified that the γ-fiber texture (<111>//ND) extremely developed by the heat-treatment at the temperature ranging from 720 to 760°C. TEM observations also revealed that the complex-precipitates composed of Ti-carbosulfide and Cu were observed only in the same range of heat-treating temperature. Improvement of r-value by high temperature hot-coiling is caused by the precipitation of Cu combined with coarse Ti-carbosulfides which avoids the detrimental influence of fine pre-precipitation of Cu in matrix.

責任著者(Corresponding author)

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