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Title: Heat and corrosion resistant cast CN-12 type stainless steel with improved high temperature strength and ductility

Abstract

A cast stainless steel alloy and articles formed therefrom containing about 0.5 wt. % to about 10 wt. % manganese, 0.02 wt. % to 0.50 wt. % N, and less than 0.15 wt. % sulfur provides high temperature strength both in the matrix and at the grain boundaries without reducing ductility due to cracking along boundaries with continuous or nearly-continuous carbides. Alloys of the present invention also have increased nitrogen solubility thereby enhancing strength at all temperatures because nitride precipitates or nitrogen porosity during casting are not observed. The solubility of nitrogen is dramatically enhanced by the presence of manganese, which also retains or improves the solubility of carbon thereby providing additional solid solution strengthening due to the presence of manganese and nitrogen, and combined carbon. Such solution strengthening enhances the high temperature precipitation-strengthening benefits of fine dispersions of NbC. Such solid solution effects also enhance the stability of the austenite matrix from resistance to excess sigma phase or chrome carbide formation at higher service temperatures. The presence of sulfides is substantially eliminated.

Inventors:
 [1];  [2];  [3];  [4];  [1]
  1. Oak Ridge, TN
  2. Morton, IL
  3. East Peoria, IL
  4. Peoria, IL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
913576
Patent Number(s):
7,255,755
Application Number:
10/195,703
Assignee:
Caterpillar Inc. (Peoria, IL) ORNL
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Mazias, Philip J, McGreevy, Tim, Pollard, Michael James, Siebenaler, Chad W, and Swindeman, Robert W. Heat and corrosion resistant cast CN-12 type stainless steel with improved high temperature strength and ductility. United States: N. p., 2007. Web.
Mazias, Philip J, McGreevy, Tim, Pollard, Michael James, Siebenaler, Chad W, & Swindeman, Robert W. Heat and corrosion resistant cast CN-12 type stainless steel with improved high temperature strength and ductility. United States.
Mazias, Philip J, McGreevy, Tim, Pollard, Michael James, Siebenaler, Chad W, and Swindeman, Robert W. Tue . "Heat and corrosion resistant cast CN-12 type stainless steel with improved high temperature strength and ductility". United States. https://www.osti.gov/servlets/purl/913576.
@article{osti_913576,
title = {Heat and corrosion resistant cast CN-12 type stainless steel with improved high temperature strength and ductility},
author = {Mazias, Philip J and McGreevy, Tim and Pollard, Michael James and Siebenaler, Chad W and Swindeman, Robert W},
abstractNote = {A cast stainless steel alloy and articles formed therefrom containing about 0.5 wt. % to about 10 wt. % manganese, 0.02 wt. % to 0.50 wt. % N, and less than 0.15 wt. % sulfur provides high temperature strength both in the matrix and at the grain boundaries without reducing ductility due to cracking along boundaries with continuous or nearly-continuous carbides. Alloys of the present invention also have increased nitrogen solubility thereby enhancing strength at all temperatures because nitride precipitates or nitrogen porosity during casting are not observed. The solubility of nitrogen is dramatically enhanced by the presence of manganese, which also retains or improves the solubility of carbon thereby providing additional solid solution strengthening due to the presence of manganese and nitrogen, and combined carbon. Such solution strengthening enhances the high temperature precipitation-strengthening benefits of fine dispersions of NbC. Such solid solution effects also enhance the stability of the austenite matrix from resistance to excess sigma phase or chrome carbide formation at higher service temperatures. The presence of sulfides is substantially eliminated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {8}
}

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