Deformation of Precision Parts in Diesel Fuel Equipment During Diffusion Metallization

The deterioration of the plunger working surfaces and sleeve worsens economic environmental performance diesel engine. Therefore, restoring worn pairs with an increase in their wear resistance is economically feasible. problem proposed to be solved by method diffusion metallization obtain hardening coatings based on iron carbides, nitrides borides alloying elements. ( Research purpose) To evaluate effect temperature regimes deformation plungers during boriding. (Materials methods) following parameters technological process are accepted: composition powder mixture, exposure time, cooling time containers, thickness coating, deflection part. materials under research 45steel, KhVG steel, 25Kh5MA steel after nitriding dissociated ammonia at fuel equipment manufacturer. (Results discussion) boride layer obtained 8-hour boriding 250; 215 170 micrometers, respectively. It found that every 2 hours result average increment 40 microns. plungers, exposed 2-hour 6-hour boriding, 9.8 12.7 micrometers containers. rate container leads warping up 35 For uniform heating, it recommended use containers containing no more than 100 plungers. (Conclusions) main reason for (deflection) detected relaxation internal stresses core part as a structural changes steel. established minimum together furnace should least 8 hours. In this case, does not exceed 20 micrometers. has been made possible reduce allowance mechanical processing 30