NGHIÊN CỨU CÔNG NGHỆ THẤM NITƠ NHIỆT ĐỘ THẤP CHO MỘT SỐ MÁC THÉP KẾT CẤU

A RESEARCH ON THE LOW-TEMPERATURE NITRIDING FOR SOME STRUCTURAL STEEL GRADESThis article presents the QPQ low temperature nitrocarburizing and plasma nitriding technologies for three steel grades C50, 30XH3A and 25X2H4BA. Various tests were carried out to determine the influence of these technologies on the change of surface quality parameters, surface hardness, hardness distribution according to the nitrided layers. In addition, the image of the microstructure and thickness of the nitrided layers were also investigated. The experimental results confirmed the possibility to create nitrided layer with improved mechanical properties using nitriding and nitrocarburizing technologies on all three steel grades.