Nitriding Of 316L Austenitic Stainless Steel And M2 High-speed Steel Based On Arc Ion Source

Plasma nitriding technology is widely used as a surface modification technology in the field of surface modification of materials.Both 316L austenitic stainless steel and M2 high speed steel play a vital role in their respective applications.Austenitic stainless steel metal products have high temperature resistance and good processing performance,so they are widely used in industrial and furniture decoration industries and food medical industries,but austenitic stainless steels have problems of poor wear resistance and low hardness.The nitriding study on the surface of 316L austenitic stainless steel can change the hardness and friction resistance of 316L austenitic stainless steel;high-speed steel is widely used as a base material for hard coatings.Its hardness affects the performance of coating tools,so it is especially important to nitriding high-speed steel.This topic aimed at 316L austenitic stainless steel and M2 high-speed steel,which have low hardness and poor wear resistance in practical applications.Using pure nitrogen as working gas,the 316L austenitic stainless steel and M2 high-speed steel were subjected to surface nitriding treatment by adjusting the axial magnetic field and pulse bias parameters by using the arc discharge type ion source,and the nitrided M2 high-speed steel was used as the matrix.The AlCrN coating treatment was carried out on the surface.The phase structure,surface morphology and nitriding depth of the nitriding layer of the modified 316L austenitic stainless steel and M2 high-speed steel were studied systematically by the arc discharge ion source plasma nitriding process.And the effects of tribological properties,and the microhardness and bonding force of AlCrN coatings based on nitrided M2 high-speed steel.In this paper,the plasma generated by the coupling of different axial magnetic field strengths with arc discharge type ion source is diagnosed by plasma emission spectroscopy;the surface of 316L austenitic stainless steel and M2 high-speed steel is surfaced by arc discharge type ion source coupled axial magnetic field.Nitriding treatment,XRD,surface morphology,nitriding depth,microhardness and tribological properties of nitriding layer of 316L austenitic stainless steel and M2 high-speed steel were analyzed by different axial magnetic field strength and pulse bias.The research results show that:the relative intensity of the plasma emission spectrum in the cavity increases significantly under the action of the axial magnetic field,,but the relative intensity of the plasma emission spectrum does not change significantly under different magnetic field strengths.And there are metastable metal atoms and metal ions in the plasma emission spectrum.Austenitic stainless steel is nitrided at a temperature of about 400? using an arc discharge type ion source at a pulse bias of 600V.It can be found that two different nitriding layer structures can be obtained under different axial magnetic field strengths.When the magnetic field strength is higher than 80Gs,a nitride phase is formed,the main composition is iron nitrogen compound phase and chromium nitride phase;when the magnetic field strength the expanded austenite phase(?N)is formed below 80Gs,and the nitrogen content locates between 22 at.%and 26 at.%.The austenitic stainless steel(?N)phase with a thickness of 50?m and a microhardness of 1100 HV0.05(4.5 times the hardness of the matrix)can be obtained by nitriding the austenitic stainless steel for 60 min using an arc discharge ion source.Nitrogen nitriding treatment of high-speed steel at nitriding temperature of 400? for 60 min,when the axial magnetic field strength is above 40Gs,the appearance of iron and nitrogen compounds on the surface of nitriding sample,when the axial magnetic field strength is below 40Gs,A nitrided layer free of iron-nitrogen compounds is obtained on the surface of the nitrided sample.And when the magnetic field strength is 80Gs,the microhardness of the nitrided layer reaches 1010HV0.05 which is 1.7 times of the microhardness of the high-speed steel matrix,and the wear resistance of the high-speed steel nitrided sample is the wear resistance of the unnitrided sample.3 times the loss performance.The AlCrN coating treatment was carried out on the surface of the M2 high-speed steel after nitriding,and the adhesion of the high-speed steel substrate after nitriding to the coating and the microhardness of the surface were investigated.The results show that the microhardness of the coating increases with the increase of the microhardness of the high-speed steel after nitriding.The microhardness of the coating reaches 3413HV0.1,which is 1.7 times of the microhardness of the ordinary coating.The bonding strength is also significantly improved,which is 1.8 times that of the ordinary coating.