Modified deep rolling on martensitic stainless steels AISI420 and 440C

Name: Sai-Yan Primee

LCSH: Kasetsart University -- Dissertations. Ph.D. (Materials Engineering) 2020

Classification :.LCCS: TA479.S7

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

LCSH: Stainless steel

LCSH: Corrosion and anti-corrosives

Abstract: Stainless steels are widely used for the automotive and machinery parts due to their high corrosion resistance and high strength, especially martensitic stainless steel. Many applications are subjected to high and cyclic loading, which directly affects the fatigue performance. Mechanical surface treatment, such as shot peening or deep rolling, is generally applied to increase fatigue performance. Deep rolling induces principally compressive residual stresses, work hardening states, and high dislocation density at the surface and in near-surface regions. However, the generated compressive residual stresses and work hardening states can be relaxed or decreased during service due to cyclic loading. To stabilize the compressive residual stresses and work-hardening states the deep rolling was modified using the strain ageing concept, such as room temperature deep rolling and followed by an appropriate annealing (static strain ageing) and high temperature deep rolling (dynamic strain ageing). The interstitial carbon atoms (Cottrell clouds) under the thermal process hindering the dislocation movement is a main mechanism to stabilize the compressive residual stresses and work-hardening states resulting in the fatigue lifetime enhancement. In this research, the effects of modified deep rolling processes (high-temperature deep rolling and room-temperature deep rolling followed by annealing) on the fatigue performance of the martensitic stainless steels AISI 420 and AISI 440C were addressed. Residual stresses and work hardening states at the surface and in near-surface regions were measured using X-ray diffraction technique. Fatigue tests were performed using a rotating bending fatigue machine. Finally, some ideas to combine the deep rolling as well as modified deep rolling into the heat treatment (hardening process) were introduced and discussed.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Patiphan Juijerm

Role: Thesis Advisor

Created: 2020

Modified: 2025-07-02

Issued: 2025-07-02

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2563/sai-yan-pri-all.pdf

CallNumber: TA479.S7 .S24

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degraee

Descipline: Materials Engineering

Grantor: Kasetsart University

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