Masters Theses


Tian Fu


"Direct metal deposition or laser cladding is a process capable of producing fully dense and net shape metal products and this process could be used on coating metal components in various engineering applications. This process has fast heating and cooling rates which can improve the surface hardness and provide excellent adhesion through metallurgical bond between coating material and substrate. This paper evaluated the laser deposited 316L stainless steel coating on 4340 steel, which is widely used for aircraft landing gear applications. The microstructure, micro-hardness and quantitative EDS were explored to verify the coating properties. The desired homogeneous microstructure and high micro-hardness for 316L stainless steel coating are obtained. In this study, single layer 316L stainless steel deposits have been evaluated. The relationship between laser deposition process parameters and coating hardness has been studied resulting in an understanding of the effect of parameters and an empirical model has been developed. The influence of shield gas and composition of the deposition and dilution zone has been investigated. The microstructures and composition analyses were evaluated by Energy Dispersive X-ray (EDX) analysis and Optical Microscopy. Homogeneous microstructure which is required for landing gear coatings has been obtained. The deposition microhardness has been evaluated using a microhardness tester. The microhardness varies from 280HV to 520HV"--Abstract, page iv.


Liou, Frank W.

Committee Member(s)

Tsai, Hai-Lung
Newkirk, Joseph William


Mechanical and Aerospace Engineering

Degree Name

M.S. in Manufacturing Engineering


National Science Foundation (U.S.)
U.S. Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Missouri University of Science and Technology. Intelligent Systems Center


This research was supported by the National Science Foundation Grant Number DMI-9871185, the grant from the U.S. Air Force Research Laboratory contract # F A8650-04-C-5704, and Missouri S&T Intelligent Systems Center.

Research Center/Lab(s)

Intelligent Systems Center


Missouri University of Science and Technology

Publication Date

Spring 2010

Journal article titles appearing in thesis/dissertation

  • Evaluation of direct diode laser deposited stainless steel 316L on 4340 steel substrate for aircraft landing gear application


ix, 30 pages

Note about bibliography

Includes bibliographical references (page 26).


© 2010 Tian Fu, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Pulsed laser deposition
Stainless steel -- Hardenability
Steel -- Microstructure

Thesis Number

T 9609

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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