Pengaruh Carburizing dan Nitriding Terhadap Sifat Mekanis pada Baja Bohler K460, Bohler K110 KNL Extra, Bohler Vcn 150 dan Hss untuk Bahan Mata Pisau Pemanen Sawit

Abstract

The problem in this research is to carburizing and nitriding using Bohler steel K-460, 150 VCN Bohler steel, steel Bohler K110 KNL EXTRA, and HSS steel, and to analyze the extent to which effect carburizing and nitriding for hardness values, chemical elements and microstructure of materials. The purpose of this research is Seeing whether steel Bohler K460, Bohler steel VCN 150, Bohler steel K110 KNL EXTRA and HSS steel, which has been processed by carburizing and nitriding possess better mechanical properties of the starting materials (raw material) without treatment whatever. Observe the effect of carburizing and nitriding for hardness, and microstructure of materials. Knowing the relationship and influence of grain size on the nature and value of hardness can extend lifespan palm blades. Improvement of mechanical properties of medium carbon steel for the blade palm harvesting is done by carbonization or carburizing and nitriding. The carburizing process of adding elements on the surface of carbon steel, heating carbonization carried out at a temperature of 700⁰ C-850⁰ C. Elemental carbon can be obtained from wood charcoal, coconut shell charcoal or a material containing the element carbon. Carbonisation aims to provide more carbon content at the surface than at the inner wall, so that the surface hardness increases. Carbonization thick in the environment depends on the time and temperature carbonization. While the process nitriding is the process of hardening the surface, using materials and different heating temperatures. Metal is heated to 500⁰ C-650⁰ C in the ammonia gas and nitrogen gas environment for some time. Nitrogen and ammonia is absorbed by the metal nitride will form a hard, spread evenly on the surface of the metal. Carbon steel has been made specifically for this process. Aluminum as much as 0.03% to 0.75%, in combination with the gas and the particles form a stable and hard. Heating temperature ranged between 500⁰C-650⁰C. On liquid nitriding (nitriding liquit) used liquid cyanide salts are kept below the temperature transpormasi area. Nitrogen absorption easier while absorbing less carbon than cyaniding or carburizing process. Achievable thickness 0.03 mm-0, 30mm. Nitrided layer formed on the surface are very high with between 300-690 Brinell hardness. It can be concluded that the influence of carburizing can add a layer on the surface of the material as well as mechanical properties, especially the elements carbon, while nitriding may decrease and increase the mechanical properties but increased hardness of raw material