TY - JOUR
T1 - Effect of plastic strain and recovery rate on thermal fatigue behavior in high heat-resistant ferritic stainless steel SUS444
AU - Nakamura, Tetsuyuki
AU - Ishikawa, Shin
AU - Yoshimi, Kyosuke
N1 - Publisher Copyright:
© 2018 Iron and Steel Institute of Japan. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Ferritic stainless steels are used for automobile exhaust parts because of their high heat and corrosion resistances. Among them, parts located upstream near engine, so-called hot-end parts, for example, exhaust manifolds, are required to show excellent heat resistance. Since thermal fatigue is induced by repeating heating and cooling with strain restriction, thermal fatigue resistance is one of the most important properties for upstream exhaust-parts materials. In this study, the effect of plastic strain and recovery rate on thermal fatigue behavior was investigated for high heat-resistant ferritic stainless steel SUS444 which has been used for automobile exhaust parts. In the case of a maximum temperature at 973 K, cracking occurred without necking. On the other hand, in the case of a maximum temperature at and above 1073 K, failure with necking was predominant. To improve the thermal fatigue resistance of SUS444 in a higher-temperature exhaust gas atmosphere, high-temperature strengthening would be more favorable.
AB - Ferritic stainless steels are used for automobile exhaust parts because of their high heat and corrosion resistances. Among them, parts located upstream near engine, so-called hot-end parts, for example, exhaust manifolds, are required to show excellent heat resistance. Since thermal fatigue is induced by repeating heating and cooling with strain restriction, thermal fatigue resistance is one of the most important properties for upstream exhaust-parts materials. In this study, the effect of plastic strain and recovery rate on thermal fatigue behavior was investigated for high heat-resistant ferritic stainless steel SUS444 which has been used for automobile exhaust parts. In the case of a maximum temperature at 973 K, cracking occurred without necking. On the other hand, in the case of a maximum temperature at and above 1073 K, failure with necking was predominant. To improve the thermal fatigue resistance of SUS444 in a higher-temperature exhaust gas atmosphere, high-temperature strengthening would be more favorable.
KW - Ferritic stainless steel
KW - Fracture
KW - Heat resistance
KW - SUS444
KW - Thermal fatigue
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U2 - 10.2355/tetsutohagane.TETSU-2018-017
DO - 10.2355/tetsutohagane.TETSU-2018-017
M3 - Article
AN - SCOPUS:85052902032
VL - 104
SP - 517
EP - 523
JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
SN - 0021-1575
IS - 9
ER -