Primary water stress corrosion cracking of Alloy 600: Effects of processing parameters

Conference · Fri Oct 22 04:00:00 EDT 1993

OSTI ID:10190553

Seman, D J; Webb, G L ^[1]; Parrington, R J ^[2]

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1. Bettis Atomic Power Lab., West Mifflin, PA (United States)
2. Knolls Atomic Power Lab., Schenectady, NY (United States)

Correlations of stress corrosion cracking (SCC) data in deaerated water with temperature, stress, metallography, and processing for laboratory test specimens are presented. Initiation time data show that a low temperature anneal and resulting absence of grain boundary carbides result in a material having increased susceptibility to SCC. Data also show that hot worked and annealed Alloy 600 is more resistant than cold worked and annealed material, both having carbide decorated grain boundaries. In absence of grain boundary carbides, both materials are equally susceptible. Low temperature thermal treatment (1100F) reduces SCC susceptibility with or without grain boundary decoration. Weld metal data and data correlations developed from 700 double U-bends are presented. Data demonstrate the effect of increased carbon content to improve SCC resistance. The data shows that the general relation of time, temperature and strain for wrought material is followed for the weld metal. The weld process used did not affect the SCC susceptibility of EN-82 which showed a greater resistance to SCC than EN-62. Stress relief of weld deposits showed an improvement for wrought material. Heat affected zone resistance was improved if the starting material received a high temperature anneal (1850 to 2000F). Range of SCC initiation times for weld metal is comparable to the range of initiation times for wrought material.

• Research Organization: Bettis Atomic Power Lab., West Mifflin, PA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC11-93PN38195
• OSTI ID: 10190553
• Report Number(s): WAPD-T--2972; CONF-9110406--1; ON: DE94001760
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105
ANNEALING
COLD WORKING
CORRELATIONS
CORROSION AND EROSION
FAILURES
INCONEL 600
STRESS CORROSION
WELDED JOINTS