AISI 4340 is known as super strength steel and widely applied in military equipment, aircraft components, automotive components, drilling device and so on because of its excellent behavior in wear, corrosion, fatigue, high temperature, and high-speed operating conditions. However, due to continuing work which reduced the performance of that component surface during their service life, an effort to improve the surface properties for a longer service life should be carried out. This paper presents the research result of the influence of diamond-like carbon coating deposited using home-made DC Chemical Vapor Deposition (DC-CVD) on the surface of AISI 4340 steel. As a carbon source, a mixture of argon (Ar) and methane (CH4) with a ratio of 24%: 76% was used in this experiment. The conditions of the experiment were 400°C of temperature at various gas pressures (1.2 mbar, 1.4 mbar, 1.6 mbar, 1.8 mbar, and 2.0 mbar) for 5 hours of coating time. Investigated surface properties are hardness, fatigue strength, and surface morphology. It was found that the optimum conditions in enhancing fatigue strength at 1.4 mbar of pressure. At these conditions, the fatigue strength increase from 401 MPa to 514 MPa, the microhardness increase from 327 VHN to 625 VHN. Based on surface morphology observation of the fracture surfaces, it shows that for raw material, an initiation crack starting from the surface. However, after being coated for 1.2 mbar, 1.4 mbar, and 1.6 mbar, the initial crack begins from the inside. The high hardness layer hinders the fatigue crack initiation.
Published in | Advances in Materials (Volume 8, Issue 1) |
DOI | 10.11648/j.am.20190801.13 |
Page(s) | 21-26 |
Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
Copyright |
Copyright © The Author(s), 2019. Published by Science Publishing Group |
AISI 4340 Steel, Diamond-Like Carbon, Fatigue Strength, CVD
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APA Style
Tjipto Sujitno, Emy Mulyani, Suprapto, Wiwien Andriyanti, Didy Suharlan, et al. (2019). Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel. Advances in Materials, 8(1), 21-26. https://doi.org/10.11648/j.am.20190801.13
ACS Style
Tjipto Sujitno; Emy Mulyani; Suprapto; Wiwien Andriyanti; Didy Suharlan, et al. Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel. Adv. Mater. 2019, 8(1), 21-26. doi: 10.11648/j.am.20190801.13
AMA Style
Tjipto Sujitno, Emy Mulyani, Suprapto, Wiwien Andriyanti, Didy Suharlan, et al. Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel. Adv Mater. 2019;8(1):21-26. doi: 10.11648/j.am.20190801.13
@article{10.11648/j.am.20190801.13, author = {Tjipto Sujitno and Emy Mulyani and Suprapto and Wiwien Andriyanti and Didy Suharlan and Viktor Malau}, title = {Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel}, journal = {Advances in Materials}, volume = {8}, number = {1}, pages = {21-26}, doi = {10.11648/j.am.20190801.13}, url = {https://doi.org/10.11648/j.am.20190801.13}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.am.20190801.13}, abstract = {AISI 4340 is known as super strength steel and widely applied in military equipment, aircraft components, automotive components, drilling device and so on because of its excellent behavior in wear, corrosion, fatigue, high temperature, and high-speed operating conditions. However, due to continuing work which reduced the performance of that component surface during their service life, an effort to improve the surface properties for a longer service life should be carried out. This paper presents the research result of the influence of diamond-like carbon coating deposited using home-made DC Chemical Vapor Deposition (DC-CVD) on the surface of AISI 4340 steel. As a carbon source, a mixture of argon (Ar) and methane (CH4) with a ratio of 24%: 76% was used in this experiment. The conditions of the experiment were 400°C of temperature at various gas pressures (1.2 mbar, 1.4 mbar, 1.6 mbar, 1.8 mbar, and 2.0 mbar) for 5 hours of coating time. Investigated surface properties are hardness, fatigue strength, and surface morphology. It was found that the optimum conditions in enhancing fatigue strength at 1.4 mbar of pressure. At these conditions, the fatigue strength increase from 401 MPa to 514 MPa, the microhardness increase from 327 VHN to 625 VHN. Based on surface morphology observation of the fracture surfaces, it shows that for raw material, an initiation crack starting from the surface. However, after being coated for 1.2 mbar, 1.4 mbar, and 1.6 mbar, the initial crack begins from the inside. The high hardness layer hinders the fatigue crack initiation.}, year = {2019} }
TY - JOUR T1 - Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel AU - Tjipto Sujitno AU - Emy Mulyani AU - Suprapto AU - Wiwien Andriyanti AU - Didy Suharlan AU - Viktor Malau Y1 - 2019/03/12 PY - 2019 N1 - https://doi.org/10.11648/j.am.20190801.13 DO - 10.11648/j.am.20190801.13 T2 - Advances in Materials JF - Advances in Materials JO - Advances in Materials SP - 21 EP - 26 PB - Science Publishing Group SN - 2327-252X UR - https://doi.org/10.11648/j.am.20190801.13 AB - AISI 4340 is known as super strength steel and widely applied in military equipment, aircraft components, automotive components, drilling device and so on because of its excellent behavior in wear, corrosion, fatigue, high temperature, and high-speed operating conditions. However, due to continuing work which reduced the performance of that component surface during their service life, an effort to improve the surface properties for a longer service life should be carried out. This paper presents the research result of the influence of diamond-like carbon coating deposited using home-made DC Chemical Vapor Deposition (DC-CVD) on the surface of AISI 4340 steel. As a carbon source, a mixture of argon (Ar) and methane (CH4) with a ratio of 24%: 76% was used in this experiment. The conditions of the experiment were 400°C of temperature at various gas pressures (1.2 mbar, 1.4 mbar, 1.6 mbar, 1.8 mbar, and 2.0 mbar) for 5 hours of coating time. Investigated surface properties are hardness, fatigue strength, and surface morphology. It was found that the optimum conditions in enhancing fatigue strength at 1.4 mbar of pressure. At these conditions, the fatigue strength increase from 401 MPa to 514 MPa, the microhardness increase from 327 VHN to 625 VHN. Based on surface morphology observation of the fracture surfaces, it shows that for raw material, an initiation crack starting from the surface. However, after being coated for 1.2 mbar, 1.4 mbar, and 1.6 mbar, the initial crack begins from the inside. The high hardness layer hinders the fatigue crack initiation. VL - 8 IS - 1 ER -