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Patiparn Ninpetch.. The study on metal 3D printing and laser powder bed fusion (L-PBF) additive manufacturing process. Master's Degree(Materials and Production Engineering (International Program)). King Mongkut's University of Technology North Bangkok. Central Library. : King Mongkut's University of Technology North Bangkok, 2018.
The study on metal 3D printing and laser powder bed fusion (L-PBF) additive manufacturing process
The study on metal three-dimensional printing and laser powder bed fusion additive manufacturing process
Name: Patiparn Ninpetch.
keyword:
Laser powder bed fusion process.
LCSH:
Additive manufacturing.
LCSH:
Stainless steels.
LCSH:
Process control
-- Computer simulation.
Abstract:
The aim of this thesis was to study the metal 3D printing technology and the laser powder fusion additive manufacturing process. The work in this thesis was divided into two parts: the numerical study with experimental validation and the experimental study and material characterization. In the first part, the numerical study was applied in order to study the effect of process parameters on physical phenomena in L-PBF process of stainless steels with different grades including AISI 304, AISI 420 and AISI 316L. The results showed that at the lower scanning speed, the temperature field has a region of heat distribution larger than that of the higher one. The results from the simulation are in agreement with the experimental results. In the second part of the thesis, the effect of laser process parameters on single track formation, layer formation, the microstructure and the microhardness of AISI 316L stainless steel fabricated by LPBF process were investigated by the experimental study. The results indicated that the width of melted track is increased when lower scanning speed are applied. The discontinuous with fragment and instability of melted track occur at the scanning speed of 5 mm/s. When the scanning speed is increased to 10 mm/s, more continuous melted track was formed. The discontinuous melted tracks with balling effect were appeared at H 0.1 mm due to oxidation reaction and the insufficient laser heat energy to fully melt the metal powder. When increasing the hatch spacing to 0.3 mm, the discontinuous melted track with balling effect can be observed with the reduced balling size. Futhermore, the microstructure of AISI 316L stainless steel fabricated by L-PBF process consists of cellular columnar structure and dendrite structure oriented according to temperature gradient direction. The L-PBF process can produce the final parts with higher microhardness than the conventional manufacturer due to rapid cooling rate and small grain size
King Mongkut's University of Technology North Bangkok. Central Library
Address:
BANGKOK
Email:
library@kmutnb.ac.th
Name: Pruet Kowitwarangkul
Role:
Thesis Advisor.
Email :
pruet.k@tggs.kmutnb.ac.th
Name: Sithipong Mahathanabodee
Role:
Thesis Advisor.
Email :
sithipong.m@eng.kmutnb.ac.th
Created:
2018
Modified:
2020-09-17
Issued:
2020-09-17
วิทยานิพนธ์/Thesis
application/pdf
eng
DegreeName: Master of Engineering
Level: Master's Degree
©copyrights King Mongkut's University of Technology North Bangkok
RightsAccess:
ใช้เวลา
0.026341 วินาที
Patiparn Ninpetch.
| Title | Contributor | Type |
|---|---|---|
| The study on metal 3D printing and laser powder bed fusion (L-PBF) additive manufacturing process
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ Patiparn Ninpetch. | Pruet Kowitwarangkul Sithipong Mahathanabodee | วิทยานิพนธ์/Thesis |
| Numerical and physical investigation of the mixing process in gas stirred ladle system
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ Sathaporn Lakkum.;Patiparn Ninpetch.;Nadnapang Phophichit.;Pruet Kowitwarangkul.;Atthasit Tawai.;Somboon Otarawanna. | บทความ/Article |
Pruet Kowitwarangkul
Sithipong Mahathanabodee
| Title | Creator | Type and Date Create |
|---|---|---|
| The study on metal 3D printing and laser powder bed fusion (L-PBF) additive manufacturing process
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ Pruet Kowitwarangkul;Sithipong Mahathanabodee | Patiparn Ninpetch. | วิทยานิพนธ์/Thesis |