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Crack initiation and propagation in welded joints of turbine and boiler steels during low cycle fatigue

Technical Report:

Abstract

Low cycle fatigue (LCF) tests have been performed at 300 and 565 degrees C on welded joints and on microstructures to be found in or near welded joints in a low alloy ferritic steel 0.5 Cr, 0.5 Mo, 0.25 V. The difference in lifetimes between the 300 degrees C and 565 degrees C tests was small comparing the same microstructures and strain ranges, although the stress amplitude was greater at 300 degrees C. Under constant stress conditions the fatigue life depended on the fatigue life of the parent metal but under constant strain conditions the lifetime was governed by that of the bainitic structures. Strain controlled LCF tests have been performed at 750 degrees C on welded joints in the austenitic steel AISI 316 and on different parent and weld metals used in these joints. In continuously cycled samples all cracks were transgranular and initiated at the surface; hold-time samples displayed internally initiated intergranular cracking in the weld metal. Under constant strain conditions the 316 parent and weld metals exhibited similar lifetimes. When considering a constant stress situation the strength of the microsturctures decreased in the following order: Sanicro weld metal, cold deformed parent metal, undeformed parent metal and weld  More>>
Authors:
Lindblom, J; Sandstroem, R; Linde, L; Henderson, P [1] 
  1. Swedish Inst. for Metals Research, Stockholm (Sweden)
Publication Date:
Dec 31, 1990
Product Type:
Technical Report
Report Number:
STU-I-774-1990; IM-2646; IM-2699.
Reference Number:
SCA: 420500; 360103; PA: AIX-23:011776; SN: 92000638014
Resource Relation:
Other Information: PBD: 1990
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; WELDED JOINTS; CRACKS; FATIGUE; AUSTENITIC STEELS; CRACK PROPAGATION; EXPERIMENTAL DATA; HEAT AFFECTED ZONE; LOW ALLOY STEELS; MATERIALS TESTING; MICROSTRUCTURE; STRESSES; 420500; 360103; MECHANICAL PROPERTIES
OSTI ID:
10113698
Research Organizations:
Swedish National Board for Technical Development, Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE92613771; TRN: SE9100230011776
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
SWDN
Size:
122 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Lindblom, J, Sandstroem, R, Linde, L, and Henderson, P. Crack initiation and propagation in welded joints of turbine and boiler steels during low cycle fatigue. Sweden: N. p., 1990. Web.
Lindblom, J, Sandstroem, R, Linde, L, & Henderson, P. Crack initiation and propagation in welded joints of turbine and boiler steels during low cycle fatigue. Sweden.
Lindblom, J, Sandstroem, R, Linde, L, and Henderson, P. 1990. "Crack initiation and propagation in welded joints of turbine and boiler steels during low cycle fatigue." Sweden.
@misc{etde_10113698,
title = {Crack initiation and propagation in welded joints of turbine and boiler steels during low cycle fatigue}
author = {Lindblom, J, Sandstroem, R, Linde, L, and Henderson, P}
abstractNote = {Low cycle fatigue (LCF) tests have been performed at 300 and 565 degrees C on welded joints and on microstructures to be found in or near welded joints in a low alloy ferritic steel 0.5 Cr, 0.5 Mo, 0.25 V. The difference in lifetimes between the 300 degrees C and 565 degrees C tests was small comparing the same microstructures and strain ranges, although the stress amplitude was greater at 300 degrees C. Under constant stress conditions the fatigue life depended on the fatigue life of the parent metal but under constant strain conditions the lifetime was governed by that of the bainitic structures. Strain controlled LCF tests have been performed at 750 degrees C on welded joints in the austenitic steel AISI 316 and on different parent and weld metals used in these joints. In continuously cycled samples all cracks were transgranular and initiated at the surface; hold-time samples displayed internally initiated intergranular cracking in the weld metal. Under constant strain conditions the 316 parent and weld metals exhibited similar lifetimes. When considering a constant stress situation the strength of the microsturctures decreased in the following order: Sanicro weld metal, cold deformed parent metal, undeformed parent metal and weld metal (K.A.E.).}
place = {Sweden}
year = {1990}
month = {Dec}
}