Nitrogen Availability Of Nitriding Atmosphere In Controlled Gas Nitriding Processes

Archives of Metallurgy and Materials

J. Michalski¹  K. Burdyński¹  P. Wach¹  Z. Łataś¹ 

[1] INSTITUTE OF PRECISION MECHANICS, 3 DUCHNICKA STR., 01-796 WARSZAWA, POLAND

关键词: Keywords: Controlled gas nitriding;    Nitrogen availability;    Nitriding potential;    Ammonia dissociation rate;    Alloyed steels;   

DOI  :  10.1515/amm-2015-0201

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Parameters which characterize the nitriding atmosphere in the gas nitriding process of steel are: the nitriding potential KN, ammonia dissociation rate α and nitrogen availabilitymN2. The article discusses the possibilities of utilization of the nitriding atmosphere’s nitrogen availability in the design of gas nitriding processes of alloyed steels in atmospheres derived from raw ammonia, raw ammonia diluted with pre-dissociated ammonia, with nitrogen, as well as with both nitrogen and pre-dissociated ammonia. The nitriding processes were accomplished in four series. The parameters selected in the particular processes were: process temperature (T), time (t), value of nitriding potential (KN), corresponding to known dissociation rate of the ammonia which dissociates during the nitriding process (α). Variable parameters were: nitrogen availability (mN2), composition of the ingoing atmosphere and flow rate of the ingoing atmosphere (FIn).

【 授权许可】

Unknown