Tribological and corrosion properties of plasma nitrided and nitrocarburized 42CrMo4 steel

4th International Conference Recent Trends in Structural Materials

Kusmic, D.^1 ; Doan Thanh, D.^1

Department of Mechanical Engineering, Faculty of Military Technology, University of Defence, Kounicova 65, Brno, EU

662 10, Czech Republic^1

关键词: Coefficient of frictions;    Corrosion property;    Laser confocal microscopy;    Plasma nitriding;    Running-in properties;    Surface corrosion;    Surface hardness;    Unlubricated sliding;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/179/1/012046/pdf
DOI  :  10.1088/1757-899X/179/1/012046

来源: IOP

【 摘 要 】

This article deals with tribological and corrosion resistance comparison of plasma nitrided and nitrocarburized 42CrMo4 steel used for breech mechanism in the armament production. Increasing of materials demands (like wear resistance, surface hardness, running-in properties and corrosion resistance) used for armament production and in other industrial application leads in the field of surface treatment. Experimental steel samples were plasma nitrided under different nitriding gas ratio at 500 C for 15h and nitrocarburized for 45 min at temperature 590C and consequently post-oxidized for 10 min at 430C. Individual 42CrMo4 steel samples were subsequently metallographically evaluated and characterized by hardness and microhardness measuring. The wear test "ball on disc" was realized for measuring of adhesive wear and coefficient of friction during unlubricated sliding. NSS corrosion tests were realized for corrosion resistance evaluation and expressed by corroded area and calculated corrosion rate. The corrosion resistance evaluation is by the surface corrosion-free surfaces evaluation supplemented using the laser confocal microscopy. Due to different surface treatment and plasma nitriding conditions, there are wear resistance and corrosion resistance differences evident between the plasma nitrided steel samples as well.