Paper Title:
Embrittlement Fracture in a 17-4 PH Stainless Steel after Aging at 400°C
  Abstract

The embrittlement fracture mechanism caused by microstructural evolution of 17-4 PH stainless steel at long term aging was studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The solution treated specimen consists largely of lath martensite with a small fraction of elongated δ-ferrite. The spherical particles existed a little in the martensite matrix, while no precipitates were present in the δ-ferrite at the solution treated specimen as non-aging. The precipitation of Fe-Cu in the δ-ferrite causes the aged hardening after long term aging accormpanied by decreases in elongation and charpy V-notch energy absorption. The increased fraction of brittle fracture on the fractured surface by impact and tensile test reveals that the embrittlement of the 17-4 PH alloys during long term aging is mainly caused by the precipitation hardening in the δ-ferrite matrix.

  Info
Periodical
Materials Science Forum (Volumes 486-487)
Edited by
Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee
Pages
241-244
DOI
10.4028/www.scientific.net/MSF.486-487.241
Citation
W. You, J. H. Lee, S. K. Shin, B. H. Choe, U. Y. Paik, J. H. Lee, "Embrittlement Fracture in a 17-4 PH Stainless Steel after Aging at 400°C", Materials Science Forum, Vols. 486-487, pp. 241-244, 2005
Online since
June 2005
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