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

Journal Article · Wed Nov 02 00:00:00 EDT 2016 · Welding Journal

OSTI ID:1331280

Tate, Stephen B. ^[1]; Javernick, Daniel Anthony ^[2]; Lienert, Thomas J. ^[2]; Liu, Stephen ^[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)

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).

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1331280
• Report Number(s): LA-UR-16-22915
• Journal Information: Welding Journal, Vol. 95, Issue 11; ISSN 0043-2296
• Publisher: American Welding Society
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Laser Welding
weldability
21-6-9