Improvement of Fatigue Strength of Maraging Steel by Shot Peening
Authors:
- 16 December 2009
- journal article
- research article
- Published by Taylor & Francis in Materials and Manufacturing Processes
- Vol. 24 (12) , 1431-1435
Abstract
Rotating bending fatigue tests up to 108 cycles were carried out to investigate the effects of shot peening on the fatigue strength and the fracture mechanism in wide range of fatigue life of an 18% Ni maraging steel by using shot particles of various sizes or hardness. Fatigue strength was increased markedly by shot peening in the wide region of fatigue life. The S-N curves showed duplex S-N properties because of the transition of fracture origin from the specimen surface in the short life region to the subsurface in the long life one. Double shot peening by using superhard fine particles was effective to improve the fatigue strength for surface fracture, though the fatigue strength for an internal fracture was only slightly influenced. Fatigue strength for the internal fracture was increased by formation of reversion austenite, suppressing intergranular cracking.Keywords
This publication has 4 references indexed in Scilit:
- Propagation Behavior of an Internal Crack of a Radical-nitrided Bearing SteelTRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 2005
- Influence of Reversion Austenite on Initiation and Propagation of Fatigue Crack of Maraging Steel.TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 2003
- Effects of nonmetallic inclusions, small defects and small cracks on fatigue strength of metals.TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 1988
- Quantitative evaluation of effects of nonmetallic inclusions on fatigue strength of high strength steel.TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 1988