Effect of Aluminum and Nitrogen on Ductility of Steels in the Temperature Range Brought into by Cold Work
1986 年 26 巻 2 号 p. 145-147
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1986 年 26 巻 2 号 p. 145-147
In order to investigate the effect of Al and N on workability at elevated temperatures attained by cold working, ductility of steels with varying Al/N ratios was examined by tensile test conducted at R. T.-250°C for low carbon steels (JIS S15C) and case hardening steels (JIS SCR420). In the low carbon steels, the ductility at those elevated temperatures was reduced markedly for lower Al/N ratios than 1.2, but did not decrease so much for higher Al/N ratios than 3.3. On the other hand, in the case hardening steels, the reduction of ductility at the same elevated temperature range was smaller and did not depend on Al/N ratio.
It appeared that the ductility of steels at those elevated temperatures is affected by the content of nitrogen in solution, which in turn depends on Al/N ratio, cooling rate from austenite, and content of other alloy elements.
