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Title: Laser weldability of 21Cr-6Ni-9Mn stainless steel: Part I - Impurity effects and solidifcation mode

For laser welded type 21Cr-6Ni-9Mn (21-6-9) stainless steels, the relationship between solidification cracking susceptibility and chemical composition was examined, and primary solidification mode (PSM) diagrams were developed to predict solidification mode. Sigmajig testing was used with experimental heats of type 21-6-9 to determine the effect of P and S on solidification cracking w hen primary austenite solidification occurred. Phosphorus showed a larger influence on solidification cracking relative to S, and a relationship of (P+0.2S ) was found for total impurity content. PSM diagrams to predict solidification mode were developed by analyzing welds made at three travel speeds for a wide range of 21-6-9 alloys and some other similar alloys. The minimum Cr eq/Ni eq required for primary ferrite solidification increased as travel speed increased, with more alloys showing primary austenite solidification at higher travel rates. Furthermore, as travel speed increased from 21 to 85 mm/s, the average solidification rate increased from 6 to 25 mm/s.
Authors:
 [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):
LA-UR-16-21510
Journal ID: ISSN 0043-2296
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Welding Journal
Additional Journal Information:
Journal Volume: 95; Journal Issue: 10; Journal ID: ISSN 0043-2296
Publisher:
American Welding Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21-6-9, Nitronic 40, laser welding
OSTI Identifier:
1331277