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Title: Laser weldability of 21Cr-6Ni-9Mn stainless steel: Part II - Weldability diagrams

In this second part of the study, weldability diagrams developed to relate solidification crack susceptibility and chemical composition for laser welded type 21Cr-6Ni-9Mn (21-6-9) stainless steel are presented. Sigmajig testing on 14 commercial 21-6-9 alloys, 20 experimental 21-6-9 alloys, and 7 other high-N, high-Mn austenitic stainless steels was used to develop weldability diagrams for solidification crack susceptibility for laser welding of type 21-6-9. Three travel speeds were used to show the changes in minimum Cr eq/Ni eq for primary ferrite solidification as solidification rate increase d with travel speed . Primary austenite solidification was observed below 1.55 Cr eq/Ni eq (Espy equivalents) at 21 mm/s travel speed. At 42 mm/s travel speed , a mix of solidification modes were displayed for alloys from 1.55-1.75 Cr eq/Ni eq. Primary ferrite solidification was observed above 1.75 Cr eq/Ni eq at both 42 and 85 mm/s travel speeds. No solidification cracking was observed for alloys with primary ferrite solidification. Lastly, variable cracking behavior was found in alloys with primary austenite solidification, but in general cracking was observed in alloys with greater than 0.02 wt-% combined impurity content according to (P+0.2S).
 [1] ;  [2] ;  [2] ;  [3]
  1. AK Steel, Butler County, OH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0043-2296
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Welding Journal
Additional Journal Information:
Journal Volume: 95; Journal Issue: 11; Journal ID: ISSN 0043-2296
American Welding Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
36 MATERIALS SCIENCE; Laser Welding, weldability, 21-6-9
OSTI Identifier: