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本文以由于轰击溅射去钝、Fe原子“氮载体”传输理论及吸附、扩散和电磁场等理论为基础,研究了强化高合金奥氏体钢表面加辅助阴极套(简称加套)的低温离子氮碳共渗新工艺.文中详细介绍了以4Cr 14Ni 14W 2Mo奥氏体钢为特例的试验数据和结果分析,其中包括利用各种新的实验手段考查参数对渗层的影响,经各种试验对比后找到的最佳工艺参数,并据以建立稳定的生产工艺规程.经本工艺成批处理后的4Cr 14Ni 14W 2Mo奥氏体钢制16240Z型柴油机气阀阀杆,通过2000小时的恶劣条件下的台架试验和三年多(走行55万公里)的实机运转考验,其磨损情况和使用寿命均比国内外同类产品为优.各种数据表明.经本工艺处理的工件的渗层质量优良,强化效果突出.本工艺比现行其它各种渗氮优越之处有:(1)于磨擦耐磨强度为气体氮化的10倍,为离子氯化的2倍,疲劳强度比气体氯化约高3kg/mm~2,比离子氮化循环次数高出一个数量级.(2)工艺稳定,生产效率高.保温只需2～4小时,较气体氮化提高8～10倍,较固体氯化提高7～8倍,较离子氮化提高1～5倍.(3)节能省料又节约时间,经济效果显著.(4)不会造成污染,操作卫生简便.
In this paper, based on the theories such as the detonation of sputter-detonation, the “nitrogen carrier” transport of Fe atoms and the theory of adsorption, diffusion and electromagnetic field, the effects of low temperature ions on the surface of the strengthened high-alloy austenitic steel with the auxiliary cathode sleeve Nitrocarburizing new technology.This paper introduces in detail the test data and results analysis of 4Cr14Ni14W 2Mo austenitic steel, including the use of a variety of new experimental methods to examine the impact of parameters on the layer, after various tests After the comparison found the best process parameters, and in accordance with the establishment of a stable production process procedures.After the batch process of 4Cr14Ni14W 2Mo austenitic steel 16240Z diesel valve stem, after 2000 hours of harsh conditions Under the bench test and more than three years (550,000 km walk) the real machine running test, the wear and life are better than similar products at home and abroad for a variety of data show that the processing of the workpiece through the layer Excellent quality and strong strengthening effect.The advantages of this technology over other nitriding technologies are as follows: (1) The frictional abrasion strength is 10 times that of gas nitriding, twice that of ionic chlorination, and the fatigue strength is higher than that of gaseous chlorine About 3kg / mm ~ 2 high , Which is an order of magnitude higher than the number of cycles of ion nitriding. (2) The process is stable and the production efficiency is high. The heat preservation only takes 2 to 4 hours, which is 8 to 10 times higher than the gas nitriding and 7 to 8 times higher than the solid chlorination, 1 to 5 times higher than that of ion nitriding. (3) Saving energy and saving time, economic effect is remarkable. (4) It will not cause pollution and easy operation and sanitation.