Kansuwan, Panya

Preferred name

Kansuwan, Panya

Alternative Name

Kansuwan, P.

Main Affiliation

School of Engineering

panya.ka@kmitl.ac.th

Now showing 1 - 5 of 5

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Dry rolling-sliding wear behavior of ER9 wheel and R260 rail couple under different operating conditions
(2023-04-15)
Tosangthum, N.
;
Krataitong, R.
;
Wila, P.
;
Koiprasert, H.
;
Buncham, K.
This work aimed to evaluate the effects of contact stress and slip ratio on wear and rolling contact fatigue of ER9 wheel steel and R260 rail steel couple under unlubricated conditions using a dual disk test. It was demonstrated that as either contact stress or slip ratio increased, so did the wear rate and surface damage of both ER9 wheels and R260 rail rollers. The wear rate of the ER9 wheel steel containing proeutectoid ferrite and the smaller structure size of pearlite increased significantly when compared to the rail steel containing fully pearlite in each pair. After testing according to the conditions used in this work, the surface hardness of the pearlitic rail steel was higher than that of the ferrite-pearlite wheel steel. The average hardening ratio of ER9 wheel steel and R260 rail steel was 0.7 and 1.28, respectively. This was consistent with the subsurface deformation angle. With full pearlite in the microstructure of rail steel, the main wear mechanism was predominantly caused by fatigue cracking and peeling, with some adhesive wear. Whereas the most prominent mechanism of the ferrite-pearlite wheel steel was adhesive wear, which was followed by spalling and small fatigue cracks.
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Effect of Pitting on the Yield Strength and Elastic Modulus for Assessment and Redesign
(2021-10-01)
Kaewpun, Yoottapong
;
Sriromreun, Parkpoom
;
Kansuwan, Panya
The pressure vessel is the current equipment that carries fluid, gas, or some solids under pressure. It can be very dangerous if it is neglected. Pitting corrosion is one of the failures that might be difficult to predict. To ensure safe usage of the vessel and to accurately predict and assess, it is necessary to comprehend the effect of pitting corrosion on the mechanical property of the material. The elastic modulus and the yield strength were investigated. A finite element analysis was performed with pitted plates subjected to a tension load. The results showed that the elastic modulus and the yield strength decreased with an increase in the percentage of volume damage by pitting or a decrease in equivalent thickness. It was found that calculating the reduction of the elastic modulus and the yield strength was more specific than simulating it due to the stress concentrator from pitting.
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Dry-sliding wear of the 316L/h-BN composites produced under crack ammonia atmosphere
(2020-01-01)
Chusong, Ekkarat
;
Kansuwan, Panya
;
Ohtake, Naoto
;
Wila, Pongsak
;
Tosangthum, Nattaya
Wear is one of different problems in mechanical failures of moving components. When a component encounters friction force on its surface, crack initiation tends to occur and wear follows crack propagation. Thus, the moving parts of automobiles should have proper wear resistance for long-time services, in addition to having high strength and hardness for heavy load operation. A self-lubricating material with compromised tribological and mechanical properties is important for some moving components. In this work, self-lubricating composites, metal matrix composites embedded with a solid lubricant, made from 316L stainless steel powder mixed with different hexagonal boron nitride (h-BN) contents of 10%, 15% and 20% by volume. The mixed powders were compacted into green parts (according with MPIF Standard 42) with density of 6.5 g·cm<sup>-3</sup>. Then, the green parts were sintered at 1100, 1150, 1200, 1250 and 1300°C under cracked ammonia (75% H<inf>2</inf>+25% N<inf>2</inf>) atmosphere for 60 min. The experimental results revealed that increases of hardness and strength sintered 316L matrix by reduction of pore amount and size were due to the increase of sintering temperature. However, the increase of h-BN content resulted in increase of pore amount and size. Additions of h-BN content up to 20 vol. % reduced friction coefficient of the sintered composites. At sintering temperatures of equal to and higher than 1200°C, h-BN did not react with 316L stainless steel powders to form intergranular boride phase. The sintered composites produced under the maximum experimental sintering temperature of 1300°C showed low specific wear rate.
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Consolidation of aluminum powder during extrusion
(2008-07-01)
Dabhade, Vikram V.
;
Kansuwan, Panya
;
Misiolek, Wojciech Z.
A study was conducted to show the consolidation of various grades of aluminum powder to pore-free density by extrusion. Powder metallurgy compacts are subjected to extrusion to provide the desired shape to the product and modify the microstructure to improve mechanical properties. Consolidation of the precompacted powders occurs primarily within the constraint of the extrusion container prior to extrusion. 2D and 3D density/porosity contour maps of precompacted powder billets at various levels of extrusion, and extrudates from each powder grade, reflect similar stages of consolidation behavior, independent of the characteristics of the aluminum powder. Microindentation hardness levels of extrudates attained steady-state values at essentially the same extrudate distance in the three grades of aluminum powder. However, the distance in breakthrough pressure is a result of different powder flow characteristics, which are influenced primarily by particle shape and not particle size.
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Grain boundary plane rotation analysis for FCC bicrystal structures using MD simulation
(2022-03-01)
Chiba, Ryoichi
;
Kansuwan, Panya
Grain boundary (GB) plane rotation, one of the GB engineering mechanisms, was investigated using the activation-relaxation technique by molecular dynamics simulation. The simulation systems considered in this work are bicrystals with Lennard-Jones-type interatomic potential. The systems of four GB types established are symmetric (SYM), asymmetric (ASYM), symmetric zigzag (SZ), and high-angle zigzag (HZ) models. Of the first two models, ς5 (310) for SYM and 36.87∘ tilted for ASYM particularly provided reference atomic potential energy distributions and structures at minimum energy state at 0 K. The characteristic of SYM is the discrete atomistic potential distributions which are distinct from ASYM. The other two models based on zigzag-like GBs were created by rotating GB planes about [001] at the center of a ς5 (310)GB system for the SZ case and a high-angle GB system for the HZ case. Simulation results show that the initially tilted GBs kinetically transferred to relaxed states for shorter-length GBs through a series of curved GBs. The GBs consist of different combinations of order defect segments, amorphous regions, and defect-free regions. A mechanism proposed is the GB plane rotation, the rate of which is structure-dependent. A low-ς coincidence site lattice boundary section can stabilize the systems at a specified metastable state.

Kansuwan, Panya

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