Research On The Effects Of Electric Pulse Treatment On Solid Nitriding Of 7Mn15Cr2Al3V2WMo Steel

The impact of pulsed electric field on the solid nitriding of 7Mn15Cr2Al3V2 WMo high manganese steel is studied in this paper. The nitriding of the high manganese steel is studied by the method of electric impulse nitriding, the solid tufftriding process of the box furnace, the Zeiss Axiovert-2000 MAT metallographic microscope, the microhardness tests, the scanning electron microscopy, X-ray diffraction and energy spectrum analysis. The experimental results show that:With the changes of the time of impulse processing, the thickness of the nitrided layer is different. Longer pulse time results in thinner nitrided layer. The optimal pulse time is 10 min and the thickness of the nitrided layer is 200μm under the experimental condition of this paper.The thickness of the nitrided layer increases with the increasement of the pulse frequency. The thickness of the nitrided layer doesn’t get thicker obviously with the lower pulse frequency. The maximum value of the thickness of the nitrided of 9Hz is about 200μm in the range of the experiments.The thickness of the nitrided layer is different with the different compositions of the nitrided carrier. The best effective composition of the nitrided carrier in the experiment is: sawdust 350 g ammonium chloride 80 g sodium carbonate 140 g, which can make the thickness of the nitrided layer reach to the maximum value of 100μm.The yellow prussiate content of the solid nitrided agents has influences on the nitrided layer of the high manganese steel. The thickness of the nitrided layer increases with the increasement of the yellow prussiate content with the process of pulsed electric field. The maximum value of the thickness of the nitrided layer is 170μm when the yellow prussiate content is 280 g and the hardness is the highest at the same time.The experimental results show that iodine has the function of catalytic cementation and the thickest thickness of the nitrided layer is about 180μm when the adding content of iodine is 2g.The microhardness is higher and the thickness of the nitrided layer is thicker with the process of electric pulse compared to them without the process of electric pulse under the condition that the above factors affecting the thickness of the nitrided layer are invariable.