Effects of heat treatment on surface properties of borided stainless steels AISI 304 & 440C

Name: Patcharin Naemchanthara

LCSH: Kasetsart University -- Dissertations. Ph.D. (Materials Engineering) 2018

Classification :.LCCS: TA479.S7

LCSH: Kasetsart University. -- Department of Materials Engineering -- Dissertations

LCSH: Stainless steel -- Corrosion

LCSH: Corrosion and anti-corrosives

Abstract: Stainless steels are widely used in many industrials because of their excellent corrosion and good strength. However, complicated and high-load applications are much more required in recent years. Therefore, the boriding process is considered and applied to the austenitic stainless steel AISI 304 and martensitic stainless steel AISI 440C to protect the surface and improve service life. Due to high alloying element in the stainless steel, the double phase boride layers, FeB & Fe2B are normally observed. The FeB is brittle phase and shall be eliminated before service. The conventional heat treatment is an alternative and simply method to eliminate as well as reduce the FeB phase. Nevertheless, the corrosion resistance and oxidation resistance of boride layer after heat treatment process is mentioned. In this work, the effects of heat treatment on microstructure, corrosion and oxidation behavior of stainless steel AISI 304 and AISI 440C were investigated. The borided stainless steel AISI 304 and AISI 440C were heat treated in a range of 800-900 oC with soaking time of 2-8 hr. Afterward, the phase transformation, corrosion and oxidation properties of boride layer are addressed. It was found that the double phase could be transformed to the single phase after heat treatment process. Moreover, the corrosion rate of the single phase Fe2B boride layer is lower than that of original and borided stainless steel. The oxidation resistance of the single phase Fe2B boride layer is highest as compared to the borided ones.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Patiphan Juijerm

Role: Thesis Advisor

Created: 2018

Modified: 2025-07-01

Issued: 2025-07-01

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2561/patcharin-nae-all.pdf

CallNumber: TA479.S7 .P37

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Materials Engineering

Grantor: Kasetsart University

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