Fatigue crack growth characteristics of laser-hardened 4130 steel

Journal Article · Mon Nov 14 23:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90124-4· OSTI ID:7183387

Wei, M Y; Chen, C ^[1]

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1. National Taiwan Univ., Taipei (Taiwan, Province of China). Inst. of Materials Science and Engineering

Laser surface hardening of steels is one of many successful applications in laser material processing. The effect of the microstructure on the da/dN of various steels has been reported by several investigators who concluded that tempered martensite has a higher resistance to da/dN than does as-quenched (AQ) martensite. In addition to the microstructure, the residual stress also has a significant influence on da/dN. Importantly, the distribution of residual stresses is not uniform through the depth of the hardened zone and may change as crack propagating takes place in the test. Owing to the complicated nature of residual stresses, it is difficult to quantitatively analyze such an influence on the da/dN of laser-hardened steels. The present study was to investigate the characteristics of da/dN in laser-hardened AISI 4130 steels. Residual stress measurements was performed on distinct laser-treated specimens in the evaluation process.

• OSTI ID: 7183387
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:10; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRACK PROPAGATION
ELECTROMAGNETIC RADIATION
FATIGUE
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
LASER RADIATION
MECHANICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATION HARDENING
RADIATIONS
RESIDUAL STRESSES
STEELS
STRESSES