Pengaruh Proses Termomekanik terhadap Sifat Mekanis Baja Bohler K-110 Knl Extra untuk Bahan Mata Pisau Pemanen Sawit

Abstract

Depormasi plastic is a metal forming process , in which the size and shape of the metal can not return to its original shape . The purpose of this study is the effect of watching hammering and the degree of deformation of the material mechanical properties such as hardness , tensile strength , and microstructure of materials. Knowing the relationship and influence of grain diameter on mechanical properties of materials . See whether the steel K - 110 which had been processed by hammering treatment possess better mechanical properties of the starting materials ( raw material) without any treatment . Improvement of mechanical properties of steel K - 110 KNL EXTRA for palm harvester blade is done by plastic deformation method using hammering.Pemanasan machine at a temperature of 700 ° C , 750 ° C , 800 ° C , 850 ° C and 900 ° C held for 1 punch a time clock to 5 seconds , 10 seconds , 15 seconds , and 20 seconds . The results of this testing are mechanical properties of high carbon steel type K - 110 KNL EXTRA with the test results obtained Hammering maximum hardness is BHN 617.8 Hammering on the process temperature 850 ° C and time blow 20 seconds. Tensile test results for the maximum value of 995.06 MPa ultimate tensile and tensile yield value ( yield ) of 680 MPa at a temperature of 850 ° C with a time of 10 seconds blow . Relationship between hardness and grain size is inversely proportional , where the smaller the grain size of the material will be the hardest . As for the relationship between tensile strength and grain size is also inversely proportional , where the larger the grain size of the material tensile strength will be smaller . The influence of the process that has been done , after having taken the optimal values are still above the results obtained from the raw material (raw material ) , so it can be concluded that the effect of the process of hammering increasmechanicalproperties.