Please use this identifier to cite or link to this item:
Title: Direct laser deposition of 410L stainless steel for surface enhancement of ASTM A36 steel
Authors: Guo, Yibo
Keywords: Engineering::Mechanical engineering
Issue Date: 2022
Publisher: Nanyang Technological University
Source: Guo, Y. (2022). Direct laser deposition of 410L stainless steel for surface enhancement of ASTM A36 steel. Master's thesis, Nanyang Technological University, Singapore.
Abstract: Direct laser deposition (DLD) is a promising technology for improvement of surface property, researchers have been performing many related studies. ASTM A36 steel is a widely applied steel for its economical and mechanical superiority. But this steel cannot undergo severe corrosion and large impact, so improving the surface properties is necessary. 410L stainless steel contains certain percentage of Cr, has outstanding corrosion resistance, hardness, ductility and high-temperature oxidation resistance. In this dissertation, 410L stainless steel powders were deposited on the surface of A36 steel. Different parameters, i.e., laser power, scanning speed and powder flow rate, were set to compare and help to select the best parameters. With optical and scanning electron microscopes, observed the morphology and microstructure of samples. Enhancement on surface hardness was measured by microhardness tests. The results point out that DLD produced three kinds of bond. For zero dilution ratio, the bond type is brazing; for samples with small molten pool depths are brazing and fusion bond type; with a large depth of molten pool, the bond type is fusion. DLD also has significant effect on microstructure evolution, thus influences the microhardness values. Laser and powder parameters act on the dilution ratio and cause phase transformation in deposit part and HAZ. Widmanstatten structure was found in fusion bond type deposition, and lath martensite appeared in HAZ. Hardness of the deposit part and HAZ are higher than substrate. The highest microhardness of the deposit part can reach 434.5 HV.
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MAE Theses

Files in This Item:
File Description SizeFormat 
Guo Yibo-Direct laser deposition of 410L stainless steel for surface enhancement of ASTM A36 steel .pdf
  Restricted Access
4.37 MBAdobe PDFView/Open

Page view(s)

Updated on May 24, 2022


Updated on May 24, 2022

Google ScholarTM


Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.