Healing of hydrogen attacked crack in austenite stainless steel by heat treatment

Xiaogang Li; Chaofang Dong; Hua Chen; Wuyang Chu

Healing of hydrogen attacked crack in austenite stainless steel by heat treatment

Xiaogang Li^*
, Chaofang Dong
, Hua Chen
, Wuyang Chu

^*Corresponding author for this work

University of Science and Technology Beijing
CAS - Institute of Metal Research

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

7 Scopus citations

Abstract

The specimens of 304 austenite stainless steel with the hydrogen attacked bubbles or cracks were heat treated under 600°C for 6 h. The SEM and TEM observations on the specimens before and after the heat treatment show that the bubbles or cracks can be healed completely by heat treatment. The healing of hydrogen attacked bubbles or cracks is closely related to heat diffusion of Fe and C atoms in austenite. The driving force of crack healing results from the plastic deforming energy E_s induced by the growth of hydrogen attacked bubbles or cracks. The critical condition of healing of bubbles or cracks is E_s ≥ 2γ/r (where γ is the surface tension, r is the radius of bubbles or half length of crack). During healing of the hydrogen attacked bubbles or cracks, the recovery, polygonization and recrystallization of the sub-grain were also taken place.

Original language	English
Pages (from-to)	1093-1096
Number of pages	4
Journal	Jinshu Xuebao/Acta Metallurgica Sinica
Volume	37
Issue number	10
State	Published - Oct 2001
Externally published	Yes

Keywords

Crack
Healing
Hydrogen attack
Stainless steel

Cite this

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title = "Healing of hydrogen attacked crack in austenite stainless steel by heat treatment",

abstract = "The specimens of 304 austenite stainless steel with the hydrogen attacked bubbles or cracks were heat treated under 600°C for 6 h. The SEM and TEM observations on the specimens before and after the heat treatment show that the bubbles or cracks can be healed completely by heat treatment. The healing of hydrogen attacked bubbles or cracks is closely related to heat diffusion of Fe and C atoms in austenite. The driving force of crack healing results from the plastic deforming energy Es induced by the growth of hydrogen attacked bubbles or cracks. The critical condition of healing of bubbles or cracks is Es ≥ 2γ/r (where γ is the surface tension, r is the radius of bubbles or half length of crack). During healing of the hydrogen attacked bubbles or cracks, the recovery, polygonization and recrystallization of the sub-grain were also taken place.",

keywords = "Crack, Healing, Hydrogen attack, Stainless steel",

author = "Xiaogang Li and Chaofang Dong and Hua Chen and Wuyang Chu",

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TY - JOUR

T1 - Healing of hydrogen attacked crack in austenite stainless steel by heat treatment

AU - Li, Xiaogang

AU - Dong, Chaofang

AU - Chen, Hua

AU - Chu, Wuyang

PY - 2001/10

Y1 - 2001/10

N2 - The specimens of 304 austenite stainless steel with the hydrogen attacked bubbles or cracks were heat treated under 600°C for 6 h. The SEM and TEM observations on the specimens before and after the heat treatment show that the bubbles or cracks can be healed completely by heat treatment. The healing of hydrogen attacked bubbles or cracks is closely related to heat diffusion of Fe and C atoms in austenite. The driving force of crack healing results from the plastic deforming energy Es induced by the growth of hydrogen attacked bubbles or cracks. The critical condition of healing of bubbles or cracks is Es ≥ 2γ/r (where γ is the surface tension, r is the radius of bubbles or half length of crack). During healing of the hydrogen attacked bubbles or cracks, the recovery, polygonization and recrystallization of the sub-grain were also taken place.

AB - The specimens of 304 austenite stainless steel with the hydrogen attacked bubbles or cracks were heat treated under 600°C for 6 h. The SEM and TEM observations on the specimens before and after the heat treatment show that the bubbles or cracks can be healed completely by heat treatment. The healing of hydrogen attacked bubbles or cracks is closely related to heat diffusion of Fe and C atoms in austenite. The driving force of crack healing results from the plastic deforming energy Es induced by the growth of hydrogen attacked bubbles or cracks. The critical condition of healing of bubbles or cracks is Es ≥ 2γ/r (where γ is the surface tension, r is the radius of bubbles or half length of crack). During healing of the hydrogen attacked bubbles or cracks, the recovery, polygonization and recrystallization of the sub-grain were also taken place.

KW - Crack

KW - Healing

KW - Hydrogen attack

KW - Stainless steel

UR - https://www.scopus.com/pages/publications/0347785183

M3 - 文章

AN - SCOPUS:0347785183

SN - 0412-1961

VL - 37

SP - 1093

EP - 1096

JO - Jinshu Xuebao/Acta Metallurgica Sinica

JF - Jinshu Xuebao/Acta Metallurgica Sinica

IS - 10

ER -

Healing of hydrogen attacked crack in austenite stainless steel by heat treatment

Abstract

Keywords

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