Recrystallization and Related Phenomena. Prediction and Control of Earing by Analysis of Texture.

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (1) —Precipitation in Austenite Region—

“…Most of researchers still believe that Ti 4 C 2 S 2 and MnS are formed only in austenite region, but some limited papers have pointed out that (f) Ti 4 C 2 S 2 is formed in ferrite region. 16,40,50,51,67) However, it has been far from accepted. For example, K. Yamada et al 40,51) and H. Murakami et al 50,67) have shown sulfide precipitation in ferrite region in Ti-IF steel.…”

“…16,40,50,51,67) However, it has been far from accepted. For example, K. Yamada et al 40,51) and H. Murakami et al 50,67) have shown sulfide precipitation in ferrite region in Ti-IF steel. The former regards it as a precipitation where TiS is continuously changed into Ti 4 C 2 S 2 in ferrite region and the latter regards it as a Ti-content-dependent precipitation where TiS is continuously changed into Ti 4 C 2 S 2 in 0.03%Ti-IF and that Ostwald ripening of TiS occurs in 0.06%Ti-IF in ferrite region.…”

“…[10][11][12][13][14][15][16][17][18][19][20] Although the sulfide precipitation in (9) austenite region has been often reported, the one in (10) ferrite region has been mentioned only in some exceptional papers but the phenomenon has not yet been understood comprehensively. 40,50,51,67) The third purpose is (#3) to generalize Cu-S precipitation phenomenon as a newly-integrated concept to apply to both non-Ti-added steel and Ti-added steel. 11,14,19) The following is overviews of past studies on Cu-related precipitation in steel and sulfide precipitation in Ti-added steel.…”

Sulfide Precipitation in Titanium-Added Steel with Residual Level of Copper (3) —Decrease of Copper Sulfide by Long-Time-Annealing in Ferrite Region—

“…As compared to the past studies, [21][22][23][24] our viewpoint can be regarded as innovative and comprehensive. As mentioned in ''Purpose of our studies and reviews of past reports'' in the first paper 1) and in ''Introduction'' in the second paper, 2) the sulfide precipitation in ferrite region has been exceptionally reported only by K. Yamada et al 21,23) and H. Murakami et al, 22,24) but their mechanisms are mutually contradictory and can be restrictedly used only for their reporting phenomena. In contrast, our mechanism has a wide application to explain the whole sulfide precipitation phenomena in ferrite region in Tiadded steel and their reported phenomena can be also interpreted logically.…”

“…Also, the precipitation in Ti-IF steel has been traditionally interpreted to finish only in austenite region and not to occur in ferrite region, except for some limited papers. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] In other words, carbon in Ti-IF steel has been regarded as completely stabilized as carbide. Therefore, it has to be made clear whether solute carbon really exists in as-hot-rolled IF steel to prove that sulfide precipitation occurs along our proposed theory.…”