The Effect of Strain Aging on Threshold Value for Surface Crack : Propagation of S45C Round Bar in Rotatory Bending

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概要

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• Both specimens fatigue-stressed at room temperature to introduce a surface crack in the range of length 50 μm to 1.5 mm and ones annealed to remove the prestress history were fatigued in rotatory bending at elevated temperatures. Precracked specimens fatigue-stressed at elevated temperatures were fatigued at room temperature also. The threshold values for fatigue crack propagation were examined. The following results were obtained. (1) The valleys and the peaks in the threshold-temperature relations for both the prestressed and annealed specimens appear at about 200℃ and 375℃, respectively. These peaks are due to a rapid strain aging. (2) While the threshold values at the peaking temperature is increased by the room temperature stress history, those at room temperature are decreased by the same stress history. (3) The threshold values at room temperature are increased by the peaking temperature stress history.

• 一般社団法人日本機械学会の論文

著者

• HIROSE Motohisa

  Junior Technical College,Gifu University

• HASEGAWA Norihiko

  Faculty of Engineering,Gifu University

• KATO Yozo

  Faculty of Engineering,Gifu University

• Kato Yozo

  Faculty Of Engineering Gifu University

• Hirose Motohisa

  Junior Technical College Gifu University

• Hasegawa Norihiko

  Faculty Of Engineering Gifu University

関連論文

• The Effect of Low Temperature Quenching and Quench Ageing on the Fatigue Strength of Notched Specimens of Low Carbon Steels
• The Effect of Strain Aging on Threshold Value for Surface Crack : Propagation of S45C Round Bar in Rotatory Bending
• Fatigue Strength of Low Carbon Steel Plate with a Sharp Notch and a Precrack under Plane Bending at Elevated Temperatures
• The Effect of Cyclic Stress Hysteresis at Elevated Temperature on the Crack Propagation Behavior in Smooth Specimens of O.45% Carbon Steel
• Effect of Cyclic Strain Ageing on the Critical Cyclic Stress Required to Propagate a Crack in Low Carbon Steels
• The Effect of Cyclic Strain Aging on the Fatigue Strength of Spheroidal Graphite Cast Iron at Elevated Temperatures

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