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The effect of the high tempering gas nitriding (HTGN) and tempering treatment in 17Cr–1Ni–0.5C (CN) steel was experimentally investigated. The HTGN was carried out at 1050°C for 1h in a gaseous atmosphere containing 98.07kPa of nitrogen. Chromium nitrides and the austenite phase appeared in the nitrogen-permeated surface layer, whereas, the interior region, into which nitrogen did not permeate, exhibited...
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