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Development of a gall-resistant stainless-steel hardfacing alloy

Journal Article · · Materials & Design
 [1];  [2];  [3];  [4];  [5];  [2];  [2]
  1. California Polytechnic State University, San Luis Obispo, CA (United States)
  2. The Ohio State Univ., Columbus, OH (United States). Dept. Materials Science and Engineering
  3. The Electric Power Research Institute, Charlotte, NC (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. Mechanical, Aerospace, and Biomedical Engineering
  5. Brazilian Nanotechnology National Laboratory-LNNano, Campinas, SP (Brazil)

Here, this work details the development of a new cobalt-free stainless steel powder metallurgy hardfacing alloy designed to replace Stellite 6, a cobalt-based hardfacing alloy used in nuclear valve applications. The fundamental strategy centers on alloying stainless steels with up to 0.5 wt% nitrogen, which is shown to increase both the volume fraction of hard phase precipitates and the strain-hardening rate of the matrix. The resultant alloy, Nitromaxx, exhibits galling performance that is comparable to Stellite 6, up to 350 °C. This performance is attributed to the suppression of strain localization events associated with galling. In particular, transmission electron microscopy and diffraction measurements from tensile tests show that the nitrogen addition decreases the calculated matrix stacking fault energy and enhances both deformation-induced martensite transformation at room temperature and deformation twinning at elevated temperature. These strain-hardening mechanisms, coupled with the increase in precipitate volume fraction, effectively suppress localization and enhance galling resistance up to 350 °C. Lastly, the enhanced galling resistance cannot be rationalized in terms of tensile stress-strain response alone.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1471842
Alternate ID(s):
OSTI ID: 23121177
Journal Information:
Materials & Design, Journal Name: Materials & Design Journal Issue: C Vol. 143; ISSN 0264-1275
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Design and Development of Apparatus for Evaluating Galling Resistance Test book September 2019

Figures / Tables (19)


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