The effects of cerium and titanium additions on hot cracking in welds of a Cr-Mo-V rotor steel

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Weld. J. (Miami); (United States)

OSTI ID:6485794

Lu, A L; Yoo, S Y; Pense, A W ^[1]

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1. College of Engineering and Physical Sciences, Lehigh Univ., Bethlehem, PA (US)

The Cr-Mo-V steels have been frequently used for turbine rotors in power generation facilities because of their superior high-temperature properties. When such a rotor fails during service due to cracking from fatigue, creep, or stress corrosion, there are several options one can take. One is to replace the rotor with a new one, which is the traditional approach. Another, now being used more commonly, is to repair the rotor using welding. The latter approach is considered increasingly feasible as welding techniques for rotor materials are developed, and it is attractive because the costs of weld repairs are significantly less than those of replacement. One of the difficulties in this kind of welding is the potential susceptibility of the rotor steel to various kinds of cracking. This investigation, which is part of a larger program on rotor steel welding concerns hot cracking and its mitigation. The tendency for cracking is therefore increased when alloy elements that promote the formation of low-melting liquid films are present. Other forms of cracking may also be of concern in these steels, such as delayed cracking or stress relief cracking. However, this paper is concerned with hot cracking. The results of the study are intended to provide potential ways to improve the quality of rotor welding, and especially repair welding.

• OSTI ID: 6485794
• Journal Information: Weld. J. (Miami); (United States), Journal Name: Weld. J. (Miami); (United States) Vol. 67:8; ISSN WEJUA
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
CERIUM ADDITIONS
CERIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM-MOLYBDENUM STEELS
CORROSION
CRACKING
CREEP
DECOMPOSITION
FABRICATION
FAILURES
FATIGUE
FRACTURES
HIGH TEMPERATURE
JOINING
MACHINERY
MATERIALS TESTING
MECHANICAL PROPERTIES
PHASE TRANSFORMATIONS
POWER GENERATION
PYROLYSIS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
ROTORS
SOLIDIFICATION
STRESS CORROSION
TESTING
THERMAL FATIGUE
THERMAL FRACTURES
THERMOCHEMICAL PROCESSES
TITANIUM ADDITIONS
TITANIUM ALLOYS
TURBINES
TURBOMACHINERY
VANADIUM ALLOYS
WELDING