Proceedings of SerbiaTrib '13

in values (312÷319 HV10). The wear resistance I ofthese cast irons consisting nanosized additives is inthe range between 6,13.10 6 ÷ 7,75.10 6 and it is with4 to 32 % higher than this one of the cast ironsamples without nanoadditives (I = 5,9.10 6 ).Samples hardness with lower bainitic structure is388÷422 HV10. The wear resistance of the castiron samples with lower bainitic structure withoutnanoadditives (I = 7,8.10 6 ) is higher than this one ofthe cast iron samples with nanoadditives ( I =5,46.10 6 ÷7,34.10 6 ). The obtained results for thewear resistance values of the tested cast ironssamples are probably related to the characteristicsof structures upper bainite, lower bainite, retainedaustenite and martensite during abrasive wear. Thedifferent quantitative proportion between thestructural components in the samples with andwithout nanoadditives defines the degree ofstrengthening and the resistance during abrasivewear due to strain ageing of the carbon sated α-solid solution (martensite and bainitic ferrite) andalso to partially transformation of the retainedaustenite into deformation martensite.Figure 3. Hardness HV10 (a) and wear resistance I (b)of austempered ductile iron samples without (5) andwith (6,7,8) nanoadditives.Figure 4. Dependence of the massive wear m on thecycles number N (a) and of the wear speed dm/dt on thefriction time t (b) (samples 1÷4).Figure 2. Hardness HV10 (a) and wear resistance I (b)of austempered ductile iron samples without (1) andwith (2,3,4) nanoadditives.40 13 th International Conference on Tribology – Serbiatrib’13