マルエージング鋼の疲労特性改善に有効な時効条件

Translated title of the contribution: Aging Condition for Improvement of Fatigue Properties of Maraging Steel

皮籠石 紀雄, 中村 祐三, 仮屋 孝二, 陳 強, 永野 茂憲, 前田 義和

Research output: Contribution to journalArticle

Abstract

The effect of aging condition on fatigue properties and the mechanism of decrease in fatigue strength in high humidity in 18% Ni maraging steel of grade 350 were investigated under rotating bending in relative humidity of 25% and 85%. Aging conditions investigated were under-, peak- and over-aging ones at the conventional aging temperature of 753K. In addition, double-aging treatments which were under- peak- and over-aging treatments at 673K and under-aging one at 473K after the peak-aging at 753K were also examined. Both of static and fatigue strengths were increased by the double-aging without any decrease in ductility and fatigue fracture toughness. Fatigue strength was markedly decreased by high humidity in all of the steels, and the decrease in fatigue strength was mainly caused by the accelerations of crack initiation and its growth at the early stage of fatigue process. The decrease in fatigue strength in high humidity was also suppressed by the double aging. A few facets comparable to a grain size of a prior austenite were observed at the fracture origins in high humidity but transgranular cracks by slip deformation were in low humidity. However most of the fracture surfaces were covered with lath boundary cracking regardless of the humidity and aging conditions. River pattern was observed in the facets, suggesting that the acceleration of crack growth in high humidity was a behavior related to hydrogen generated in cathode reaction. Based on the results, new aging treatment for improvement of fatigue properties of maraging steel was proposed.
Original languageJapanese
Pages (from-to)756-763
Number of pages8
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume62
Issue number12
DOIs
Publication statusPublished - 2013

Fingerprint

maraging steels
Maraging steel
Aging of materials
Fatigue of materials
humidity
Atmospheric humidity
flat surfaces
cracks
Steel
crack initiation
austenite
fracture strength
ductility
Crack initiation
Austenite
rivers

Cite this

マルエージング鋼の疲労特性改善に有効な時効条件. / 皮籠石紀雄; 中村祐三; 仮屋孝二; 陳強; 永野茂憲; 前田義和.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 62, No. 12, 2013, p. 756-763.

Research output: Contribution to journalArticle

皮籠石紀雄, 中村祐三, 仮屋孝二, 陳強, 永野茂憲 & 前田義和 2013, 'マルエージング鋼の疲労特性改善に有効な時効条件', Zairyo/Journal of the Society of Materials Science, Japan, vol. 62, no. 12, pp. 756-763. https://doi.org/10.2472/jsms.62.756
皮籠石紀雄 ; 中村祐三 ; 仮屋孝二 ; 陳強 ; 永野茂憲 ; 前田義和. / マルエージング鋼の疲労特性改善に有効な時効条件. In: Zairyo/Journal of the Society of Materials Science, Japan. 2013 ; Vol. 62, No. 12. pp. 756-763.
@article{3e53ed0752ad49ee88ff0e1b488f5d94,
title = "マルエージング鋼の疲労特性改善に有効な時効条件",
abstract = "The effect of aging condition on fatigue properties and the mechanism of decrease in fatigue strength in high humidity in 18{\%} Ni maraging steel of grade 350 were investigated under rotating bending in relative humidity of 25{\%} and 85{\%}. Aging conditions investigated were under-, peak- and over-aging ones at the conventional aging temperature of 753K. In addition, double-aging treatments which were under- peak- and over-aging treatments at 673K and under-aging one at 473K after the peak-aging at 753K were also examined. Both of static and fatigue strengths were increased by the double-aging without any decrease in ductility and fatigue fracture toughness. Fatigue strength was markedly decreased by high humidity in all of the steels, and the decrease in fatigue strength was mainly caused by the accelerations of crack initiation and its growth at the early stage of fatigue process. The decrease in fatigue strength in high humidity was also suppressed by the double aging. A few facets comparable to a grain size of a prior austenite were observed at the fracture origins in high humidity but transgranular cracks by slip deformation were in low humidity. However most of the fracture surfaces were covered with lath boundary cracking regardless of the humidity and aging conditions. River pattern was observed in the facets, suggesting that the acceleration of crack growth in high humidity was a behavior related to hydrogen generated in cathode reaction. Based on the results, new aging treatment for improvement of fatigue properties of maraging steel was proposed.",
author = "紀雄 皮籠石 and 祐三 中村 and 孝二 仮屋 and 強 陳 and 茂憲 永野 and 義和 前田",
year = "2013",
doi = "10.2472/jsms.62.756",
language = "Japanese",
volume = "62",
pages = "756--763",
journal = "Zairyo/Journal of the Society of Materials Science, Japan",
issn = "0514-5163",
publisher = "公益社団法人 日本材料学会",
number = "12",

}

TY - JOUR

T1 - マルエージング鋼の疲労特性改善に有効な時効条件

AU - 皮籠石, 紀雄

AU - 中村, 祐三

AU - 仮屋, 孝二

AU - 陳, 強

AU - 永野, 茂憲

AU - 前田, 義和

PY - 2013

Y1 - 2013

N2 - The effect of aging condition on fatigue properties and the mechanism of decrease in fatigue strength in high humidity in 18% Ni maraging steel of grade 350 were investigated under rotating bending in relative humidity of 25% and 85%. Aging conditions investigated were under-, peak- and over-aging ones at the conventional aging temperature of 753K. In addition, double-aging treatments which were under- peak- and over-aging treatments at 673K and under-aging one at 473K after the peak-aging at 753K were also examined. Both of static and fatigue strengths were increased by the double-aging without any decrease in ductility and fatigue fracture toughness. Fatigue strength was markedly decreased by high humidity in all of the steels, and the decrease in fatigue strength was mainly caused by the accelerations of crack initiation and its growth at the early stage of fatigue process. The decrease in fatigue strength in high humidity was also suppressed by the double aging. A few facets comparable to a grain size of a prior austenite were observed at the fracture origins in high humidity but transgranular cracks by slip deformation were in low humidity. However most of the fracture surfaces were covered with lath boundary cracking regardless of the humidity and aging conditions. River pattern was observed in the facets, suggesting that the acceleration of crack growth in high humidity was a behavior related to hydrogen generated in cathode reaction. Based on the results, new aging treatment for improvement of fatigue properties of maraging steel was proposed.

AB - The effect of aging condition on fatigue properties and the mechanism of decrease in fatigue strength in high humidity in 18% Ni maraging steel of grade 350 were investigated under rotating bending in relative humidity of 25% and 85%. Aging conditions investigated were under-, peak- and over-aging ones at the conventional aging temperature of 753K. In addition, double-aging treatments which were under- peak- and over-aging treatments at 673K and under-aging one at 473K after the peak-aging at 753K were also examined. Both of static and fatigue strengths were increased by the double-aging without any decrease in ductility and fatigue fracture toughness. Fatigue strength was markedly decreased by high humidity in all of the steels, and the decrease in fatigue strength was mainly caused by the accelerations of crack initiation and its growth at the early stage of fatigue process. The decrease in fatigue strength in high humidity was also suppressed by the double aging. A few facets comparable to a grain size of a prior austenite were observed at the fracture origins in high humidity but transgranular cracks by slip deformation were in low humidity. However most of the fracture surfaces were covered with lath boundary cracking regardless of the humidity and aging conditions. River pattern was observed in the facets, suggesting that the acceleration of crack growth in high humidity was a behavior related to hydrogen generated in cathode reaction. Based on the results, new aging treatment for improvement of fatigue properties of maraging steel was proposed.

U2 - 10.2472/jsms.62.756

DO - 10.2472/jsms.62.756

M3 - 記事

VL - 62

SP - 756

EP - 763

JO - Zairyo/Journal of the Society of Materials Science, Japan

JF - Zairyo/Journal of the Society of Materials Science, Japan

SN - 0514-5163

IS - 12

ER -