Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel

Bumjoon Kim; Jonghoon Lee; Jiwoo Im; Jongbum Kim; Moonki Kim; Hakjoon Kim; Sungjin Song; Byeongsoo Lim

doi:10.1007/s12206-012-0838-0

Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel

Bumjoon Kim
, Jonghoon Lee
, Jiwoo Im
, Jongbum Kim
, Moonki Kim
, Hakjoon Kim
, Sungjin Song
, Byeongsoo Lim

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

In this work, we examined the influence of microstructural changes, such as an intermetallic sigma (σ) phase, on the fatigue behavior of high-temperature aged AISI 316L stainless steel. Nondestructive ultrasonic test and fatigue crack growth tests were performed to determine the threshold stress intensity factor of these artificially aged specimens. Ultrasonic test results characterizing the microstructural changes were compared with those of the fatigue tests to propose an empirical formula capable of predicting the threshold stress intensity factor by a nondestructive method. We observed a strong correlation between the increase in the volume fraction of the σ phase and the decrease of ΔK_th. Ultrasonic velocity increased in response to the coarsening behavior of the σ phase in the vicinity of the grain boundaries.

Original language	English
Pages (from-to)	3091-3096
Number of pages	6
Journal	Journal of Mechanical Science and Technology
Volume	26
Issue number	10
DOIs	https://doi.org/10.1007/s12206-012-0838-0
State	Published - Oct 2012

Keywords

Fatigue crack growth
Sigma phase
Threshold stress intensity factor
Ultrasonic velocity

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10.1007/s12206-012-0838-0

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title = "Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel",

abstract = "In this work, we examined the influence of microstructural changes, such as an intermetallic sigma (σ) phase, on the fatigue behavior of high-temperature aged AISI 316L stainless steel. Nondestructive ultrasonic test and fatigue crack growth tests were performed to determine the threshold stress intensity factor of these artificially aged specimens. Ultrasonic test results characterizing the microstructural changes were compared with those of the fatigue tests to propose an empirical formula capable of predicting the threshold stress intensity factor by a nondestructive method. We observed a strong correlation between the increase in the volume fraction of the σ phase and the decrease of ΔKth. Ultrasonic velocity increased in response to the coarsening behavior of the σ phase in the vicinity of the grain boundaries.",

keywords = "Fatigue crack growth, Sigma phase, Threshold stress intensity factor, Ultrasonic velocity",

author = "Bumjoon Kim and Jonghoon Lee and Jiwoo Im and Jongbum Kim and Moonki Kim and Hakjoon Kim and Sungjin Song and Byeongsoo Lim",

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T1 - Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel

AU - Kim, Bumjoon

AU - Lee, Jonghoon

AU - Im, Jiwoo

AU - Kim, Jongbum

AU - Kim, Moonki

AU - Kim, Hakjoon

AU - Song, Sungjin

AU - Lim, Byeongsoo

PY - 2012/10

Y1 - 2012/10

N2 - In this work, we examined the influence of microstructural changes, such as an intermetallic sigma (σ) phase, on the fatigue behavior of high-temperature aged AISI 316L stainless steel. Nondestructive ultrasonic test and fatigue crack growth tests were performed to determine the threshold stress intensity factor of these artificially aged specimens. Ultrasonic test results characterizing the microstructural changes were compared with those of the fatigue tests to propose an empirical formula capable of predicting the threshold stress intensity factor by a nondestructive method. We observed a strong correlation between the increase in the volume fraction of the σ phase and the decrease of ΔKth. Ultrasonic velocity increased in response to the coarsening behavior of the σ phase in the vicinity of the grain boundaries.

AB - In this work, we examined the influence of microstructural changes, such as an intermetallic sigma (σ) phase, on the fatigue behavior of high-temperature aged AISI 316L stainless steel. Nondestructive ultrasonic test and fatigue crack growth tests were performed to determine the threshold stress intensity factor of these artificially aged specimens. Ultrasonic test results characterizing the microstructural changes were compared with those of the fatigue tests to propose an empirical formula capable of predicting the threshold stress intensity factor by a nondestructive method. We observed a strong correlation between the increase in the volume fraction of the σ phase and the decrease of ΔKth. Ultrasonic velocity increased in response to the coarsening behavior of the σ phase in the vicinity of the grain boundaries.

KW - Fatigue crack growth

KW - Sigma phase

KW - Threshold stress intensity factor

KW - Ultrasonic velocity

UR - https://www.scopus.com/pages/publications/84870267954

U2 - 10.1007/s12206-012-0838-0

DO - 10.1007/s12206-012-0838-0

M3 - Article

AN - SCOPUS:84870267954

SN - 1738-494X

VL - 26

SP - 3091

EP - 3096

JO - Journal of Mechanical Science and Technology

JF - Journal of Mechanical Science and Technology

IS - 10

ER -

Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel

Abstract

Keywords

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