Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel
Advances in Materials
Volume 8, Issue 1, March 2019, Pages: 21-26
Received: Jan. 15, 2019;
Accepted: Feb. 20, 2019;
Published: Mar. 12, 2019
Views 217 Downloads 50
Tjipto Sujitno, Particle Physics Department, Center for Accelerator Science and Technology, National Nuclear Energy Agency, Yogyakarta, Indonesia
Emy Mulyani, Particle Physics Department, Center for Accelerator Science and Technology, National Nuclear Energy Agency, Yogyakarta, Indonesia
Suprapto, Particle Physics Department, Center for Accelerator Science and Technology, National Nuclear Energy Agency, Yogyakarta, Indonesia
Wiwien Andriyanti, Particle Physics Department, Center for Accelerator Science and Technology, National Nuclear Energy Agency, Yogyakarta, Indonesia
Didy Suharlan, Mechanical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia
Viktor Malau, Mechanical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia
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.
Effect of Diamond-Like Carbon Thin Film on the Fatigue Strength of AISI 4340 Steel, Advances in Materials.
Vol. 8, No. 1,
2019, pp. 21-26.
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