| 摘要 |
PROBLEM TO BE SOLVED: To provide a nitriding quenching method which removes fluctuation of nitriding concentration of nitrogen permeating and diffusing into a work and, moreover, can stabilize quality of a nitrided quench article. SOLUTION: The nitriding quenching method of causing nitrogen to permeate and diffuse into the work 1 made of steel material and, thereafter, performing quenching includes: a plastic flow layer improving process S1 of raising a temperature of the work 1 to the austenite region temperature of the work 1 and retaining the work 1 for a prescribed time as it is to improve a plastic flow layer of the work; a nitriding process S2 of raising or lowering the temperature of the work 1 to the nitriding temperature and nitriding the work 1 of which the plastic flow layer is improved; and a quenching process S3 of quenching the work 1 subjected to nitriding. COPYRIGHT: (C)2011,JPO&INPIT
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