Pitting behavior of type 17-4 PH stainless steel weldments

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Corrosion

DOI:https://doi.org/10.5006/1.3293618· OSTI ID:103958

Raja, K S ^[1]; Rao, K P ^[2]

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1. EWAC Alloys Limited, Bombay (India)
2. Indian Inst. of Tech., Madras (India). Dept. of Metallurgical Engineering

Electrochemical methods of measuring pitting potentials (E{sub pit}) were used to study the pitting resistance of type 17% Cr-4% Ni (17-4, UNS S17400) precipitation hardenable (PH) stainless steel (SS) weldments. The main objectives were to evaluate the pitting resistance of the base metal, the heat-affected zone (HAZ), and the weld metal portions of 17-4 PH SS welds welded autogenously using the gas tungsten arc welding (GTAW) process. Effects of different preweld and postweld heat treatments (PWHT) and of the weld heat input on pitting resistance were studied. Results showed a solution-treated base metal had a relatively lower pitting resistance. In contrast, aging preceded by solution treatment improved pitting resistance. Direct peak aging after welding improved pitting resistance of the weld metals, but it decreased resistance of the HAZ. Welding with relatively lower weld heat input decreased the pitting resistance of the weld metals, but the reverse occurred in the case of the HAZ. Solution treatment followed by peak aging nullified effects of the weld heat input and the preweld heat treatments on pitting resistance of the different portions of the weldment. This heat treatment produced relatively higher pitting resistance in all portions of the weldment.

• Sponsoring Organization: USDOE
• OSTI ID: 103958
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 8 Vol. 51; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGE HARDENING
CHROMIUM-NICKEL STEELS
CORROSION RESISTANCE
GAS TUNGSTEN-ARC WELDING
PITTING CORROSION
PRECIPITATION HARDENING
WELDED JOINTS