| dc.description.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 | en_US |
