Pengaruh Proses Termomekanik terhadap Sifat Mekanis Baja Bohler VCN 150 untuk Mata Pisau Pemanen Sawit

Abstract

Thermomechanical process has been done on the VCN 150 Bohler steel material to improve the mechanical properties of the material to be used as palm harvester blade. Thermomechanical process by varying the heating at a temperature of 700 ° C, 750 ° C, 800 ° C, 850 ° C and 900 ° C with a forging process / hammering at the detention time 5s, 10s, 15s and 20s gradually. Results of hardness testing temperature optimum value of each hammer blow terjati in 10 seconds , at BHN 506.6 BHN , 499.2 BHN 491.8 BHN , 266.2 BHN and 275.8 BHN each variation suhu. three highest optimum value of hardness test results taken for the tensile test results obtained the optimum tensile testing with a ultimate stress of 1149.305 MPa and yield stress 930 506 MPa on temperature 700 ° C/10s.Correlation the mechanical properties , where the smaller the grain size the hardness and tensile strength will increase . As for the warming relationship between deformation and grain size , which at the same time 10 seconds blow the higher the heating temperature increasing deformation and followed enlarged grain diameter . Thermomechanical process can fix the mechanical properties and reduce the size of the grain diameter steel BOHLER VCN 150