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本文通过对工件深孔的辉光离子氮化的一些实验,说明当L/D<4时(L——孔总长度,D——内孔直径),内孔不必放内阳极就可使内孔发生离子氮化。L/D>4时,内孔需要放阳极。并且发现了当L/D>4,内孔不放阳极而有外阳极且保温时间较长时,内孔表面也能形成氮化层,但很浅。如对37SiMn_2MoV钢,在550±10℃保温16小时,内孔有0.15～0.20毫米深氮化层,这时内孔所进行的氮化是气体氮化而不是离子氮化;即外侧和内孔同时分别进行着离子氮化和气体氮化。内孔气体氮化所需的温度是外侧离子氮化产生热量向内孔传导的结果。实验及生产得出37SiMn_2MoV钢在离子氮化中能获得HV450——650表面硬度,且易得到较深的氮化层。本文还对37SiMn_2MoV,40Cr,38CrMoAl钢的氮化层进行了电镜分析。
In this paper, some experiments on the glow ion nitriding of the workpiece deep hole show that when the L / D <4 (L - the total length of the hole, D - the diameter of the inner hole) Hole nitriding occurs. L / D> 4, the hole need to put the anode. And found that when the L / D> 4, the inner hole without the anode and the outer anode and holding time longer, the inner surface of the hole can form nitride layer, but very shallow. If the 37SiMn_2MoV steel, at 550 ± 10 ℃ for 16 hours, the inner hole 0.15 ~ 0.20 mm deep nitriding layer, then nitriding of the inner hole is nitriding gas instead of nitriding; the outer and inner holes At the same time, respectively, ion nitriding and gas nitriding. The temperature required for nitridation of the inner pores is the result of conduction of heat from the outer ion nitriding to the inner pores. Experimental and production of 37SiMn_2MoV steel obtained in the ion nitriding HV450 - 650 surface hardness, and easy to get deeper nitriding layer. In this paper, nitrided layers of 37SiMn_2MoV, 40Cr and 38CrMoAl steel were also analyzed by electron microscopy.