Effect of aging time on metastable pitting resistance of a precipitation-strengthened Fe-Ni based austenitic alloy

doi:10.13251/j.issn.0254-6051.2025.04.023

Abstract

Abstract: A solution treated Fe-Ni based austenitic alloy was aged at 740 ℃ for different time, and the metastable pitting resistance of the alloy was characterized by potentiodynamic polarization test and potentiostatic polarization test. Then the causes of pitting were analyzed by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that the alloy solution treated at 980 ℃ for 1 h then air cooling has the best metastable pitting resistance. In the alloy specimens aged at 740 ℃ for different time (4, 8, 16, 32 h), the pitting of specimen aged for 4 h occurs around the Al-rich precipitates, while that for 8, 16 and 32 h is on the Ti-rich precipitates. Both precipitates are deficient in Ni. As the aging time increases, the size of the precipitates increases, the Ni-poor region correspondingly increases, and metastable pitting occurs in the Ni-poor region.

Key words: precipitation strengthened austenitic alloy, aging time, metastable pitting, corrosion morphology

CLC Number:

Yan Yingjie, Lu Pengjiang, Zhang Yukun, Cao Rui. Effect of aging time on metastable pitting resistance of a precipitation-strengthened Fe-Ni based austenitic alloy[J]. Heat Treatment of Metals, 2025, 50(4): 162-167.

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