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

Tate, Stephen B.; Javernick, Daniel Anthony; Lienert, Thomas J.; Liu, Stephen

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

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Abstract

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).

Authors:

Tate, Stephen B. ^[1]; Javernick, Daniel Anthony ^[2]; Lienert, Thomas J. ^[2]; Liu, Stephen ^[3]

AK Steel, Butler County, OH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Colorado School of Mines, Golden, CO (United States)

Publication Date:: Wed Nov 02 00:00:00 EDT 2016

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1331280

Report Number(s):: LA-UR-16-22915
Journal ID: ISSN 0043-2296

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Welding Journal

Additional Journal Information:: Journal Volume: 95; Journal Issue: 11; Journal ID: ISSN 0043-2296

Publisher:: American Welding Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Laser Welding, weldability, 21-6-9

Citation Formats


                    Tate, Stephen B., Javernick, Daniel Anthony, Lienert, Thomas J., and Liu, Stephen. Laser weldability of 21Cr-6Ni-9Mn stainless steel: Part II - Weldability diagrams.  United States: N. p., 2016. 
Web.

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                    Tate, Stephen B., Javernick, Daniel Anthony, Lienert, Thomas J., & Liu, Stephen. Laser weldability of 21Cr-6Ni-9Mn stainless steel: Part II - Weldability diagrams.  United States.

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                    Tate, Stephen B., Javernick, Daniel Anthony, Lienert, Thomas J., and Liu, Stephen. Wed .  
"Laser weldability of 21Cr-6Ni-9Mn stainless steel: Part II - Weldability diagrams".  United States.  https://www.osti.gov/servlets/purl/1331280.

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@article{osti_1331280,

  title        = {Laser weldability of 21Cr-6Ni-9Mn stainless steel: Part II - Weldability diagrams},

  author       = {Tate, Stephen B. and Javernick, Daniel Anthony and Lienert, Thomas J. and Liu, Stephen},

  abstractNote = {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 Creq/Nieq for primary ferrite solidification as solidification rate increase d with travel speed . Primary austenite solidification was observed below 1.55 Creq/Nieq (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 Creq/Nieq. Primary ferrite solidification was observed above 1.75 Creq/Nieq 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).},

  doi          = {},

  journal      = {Welding Journal},

  number       = 11,

  volume       = 95,

  place        = {United States},

  year         = {Wed Nov 02 00:00:00 EDT 2016},

  month        = {Wed Nov 02 00:00:00 EDT 2016}

}

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