Management of nitrogen in chromium

M. P. Brady; I. M. Anderson; H. M. Meyer; L. R. Walker; M. K. Miller; D. J. Larson; V. K. Sikka; I. G. Wright; P. F. Tortorelli; J. R. Keiser; C. A. Walls; M. L. Weaver

Management of nitrogen in chromium

M. P. Brady, I. M. Anderson, H. M. Meyer, L. R. Walker, M. K. Miller, D. J. Larson, V. K. Sikka, I. G. Wright, P. F. Tortorelli, J. R. Keiser, C. A. Walls, M. L. Weaver

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Work by Scruggs in the 1960's demonstrated that tensile ductility could be achieved at room temperature in sintered and extruded powder-metallurgical Cr alloyed with MgO. During sintering, some of the MgO converted to the MgCr₂O₄ spinel phase, which was hypothesized to getter N from the Cr, rendering ductile. Recent efforts at Oak Ridge National Laboratory and the University of Alabama have succeeded in duplicating this original effect. Room-temperature tensile elongations of 4% were obtained for hot-pressed Cr-6MgO-(0-1)Ti wt.% and 10% for hot-pressed/extruded Cr-6MgO-0.75Ti wt.%. Direct incorporation of N into the MgCr₂O₄ phase was not detected; however, impurities (particularly N and S) were observed to segregate to and/or precipitate at interfaces between the MgO/MgCr₂O₄ phases and the Cr matrix. Elevated temperature exposure of these alloys in N-maintaining environments resulted in Cr₂N subscale formation. Possible mechanisms by which the MgO additions may important room-temperature tensile ductility in Cr and potential applications for this unique class of materials are discussed.

Original language	English
Title of host publication	John Stringer Symposium on High Temperature Corrosion
Editors	P.F. Tortorelli, I.G. Wright, P.Y. Hou
Pages	95-105
Number of pages	11
State	Published - 2001
Event	John Stringer Symposium on High Temperature Corrosion - Indianapolis, IN, United States Duration: Nov 5 2001 → Nov 8 2001

Publication series

Name	John Stringer Symposium on High Temperature Corrosion

Conference

Conference	John Stringer Symposium on High Temperature Corrosion
Country/Territory	United States
City	Indianapolis, IN
Period	11/5/01 → 11/8/01

Cite this

Brady, M. P., Anderson, I. M., Meyer, H. M., Walker, L. R., Miller, M. K., Larson, D. J., Sikka, V. K., Wright, I. G., Tortorelli, P. F., Keiser, J. R., Walls, C. A., & Weaver, M. L. (2001). Management of nitrogen in chromium. In P. F. Tortorelli, I. G. Wright, & P. Y. Hou (Eds.), John Stringer Symposium on High Temperature Corrosion (pp. 95-105). (John Stringer Symposium on High Temperature Corrosion).

@inproceedings{4eeae06bf8ee4d489b614d67a61d005e,

title = "Management of nitrogen in chromium",

abstract = "Work by Scruggs in the 1960's demonstrated that tensile ductility could be achieved at room temperature in sintered and extruded powder-metallurgical Cr alloyed with MgO. During sintering, some of the MgO converted to the MgCr2O4 spinel phase, which was hypothesized to getter N from the Cr, rendering ductile. Recent efforts at Oak Ridge National Laboratory and the University of Alabama have succeeded in duplicating this original effect. Room-temperature tensile elongations of 4% were obtained for hot-pressed Cr-6MgO-(0-1)Ti wt.% and 10% for hot-pressed/extruded Cr-6MgO-0.75Ti wt.%. Direct incorporation of N into the MgCr2O4 phase was not detected; however, impurities (particularly N and S) were observed to segregate to and/or precipitate at interfaces between the MgO/MgCr2O4 phases and the Cr matrix. Elevated temperature exposure of these alloys in N-maintaining environments resulted in Cr2N subscale formation. Possible mechanisms by which the MgO additions may important room-temperature tensile ductility in Cr and potential applications for this unique class of materials are discussed.",

author = "Brady, {M. P.} and Anderson, {I. M.} and Meyer, {H. M.} and Walker, {L. R.} and Miller, {M. K.} and Larson, {D. J.} and Sikka, {V. K.} and Wright, {I. G.} and Tortorelli, {P. F.} and Keiser, {J. R.} and Walls, {C. A.} and Weaver, {M. L.}",

year = "2001",

language = "English",

isbn = "0871707578",

series = "John Stringer Symposium on High Temperature Corrosion",

pages = "95--105",

editor = "P.F. Tortorelli and I.G. Wright and P.Y. Hou",

booktitle = "John Stringer Symposium on High Temperature Corrosion",

note = "John Stringer Symposium on High Temperature Corrosion ; Conference date: 05-11-2001 Through 08-11-2001",

}

Brady, MP, Anderson, IM, Meyer, HM, Walker, LR, Miller, MK, Larson, DJ, Sikka, VK, Wright, IG, Tortorelli, PF, Keiser, JR, Walls, CA & Weaver, ML 2001, Management of nitrogen in chromium. in PF Tortorelli, IG Wright & PY Hou (eds), John Stringer Symposium on High Temperature Corrosion. John Stringer Symposium on High Temperature Corrosion, pp. 95-105, John Stringer Symposium on High Temperature Corrosion, Indianapolis, IN, United States, 11/5/01.

TY - GEN

T1 - Management of nitrogen in chromium

AU - Brady, M. P.

AU - Anderson, I. M.

AU - Meyer, H. M.

AU - Walker, L. R.

AU - Miller, M. K.

AU - Larson, D. J.

AU - Sikka, V. K.

AU - Wright, I. G.

AU - Tortorelli, P. F.

AU - Keiser, J. R.

AU - Walls, C. A.

AU - Weaver, M. L.

PY - 2001

Y1 - 2001

N2 - Work by Scruggs in the 1960's demonstrated that tensile ductility could be achieved at room temperature in sintered and extruded powder-metallurgical Cr alloyed with MgO. During sintering, some of the MgO converted to the MgCr2O4 spinel phase, which was hypothesized to getter N from the Cr, rendering ductile. Recent efforts at Oak Ridge National Laboratory and the University of Alabama have succeeded in duplicating this original effect. Room-temperature tensile elongations of 4% were obtained for hot-pressed Cr-6MgO-(0-1)Ti wt.% and 10% for hot-pressed/extruded Cr-6MgO-0.75Ti wt.%. Direct incorporation of N into the MgCr2O4 phase was not detected; however, impurities (particularly N and S) were observed to segregate to and/or precipitate at interfaces between the MgO/MgCr2O4 phases and the Cr matrix. Elevated temperature exposure of these alloys in N-maintaining environments resulted in Cr2N subscale formation. Possible mechanisms by which the MgO additions may important room-temperature tensile ductility in Cr and potential applications for this unique class of materials are discussed.

AB - Work by Scruggs in the 1960's demonstrated that tensile ductility could be achieved at room temperature in sintered and extruded powder-metallurgical Cr alloyed with MgO. During sintering, some of the MgO converted to the MgCr2O4 spinel phase, which was hypothesized to getter N from the Cr, rendering ductile. Recent efforts at Oak Ridge National Laboratory and the University of Alabama have succeeded in duplicating this original effect. Room-temperature tensile elongations of 4% were obtained for hot-pressed Cr-6MgO-(0-1)Ti wt.% and 10% for hot-pressed/extruded Cr-6MgO-0.75Ti wt.%. Direct incorporation of N into the MgCr2O4 phase was not detected; however, impurities (particularly N and S) were observed to segregate to and/or precipitate at interfaces between the MgO/MgCr2O4 phases and the Cr matrix. Elevated temperature exposure of these alloys in N-maintaining environments resulted in Cr2N subscale formation. Possible mechanisms by which the MgO additions may important room-temperature tensile ductility in Cr and potential applications for this unique class of materials are discussed.

UR - http://www.scopus.com/inward/record.url?scp=11144357361&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:11144357361

SN - 0871707578

T3 - John Stringer Symposium on High Temperature Corrosion

SP - 95

EP - 105

BT - John Stringer Symposium on High Temperature Corrosion

A2 - Tortorelli, P.F.

A2 - Wright, I.G.

A2 - Hou, P.Y.

T2 - John Stringer Symposium on High Temperature Corrosion

Y2 - 5 November 2001 through 8 November 2001

ER -

Management of nitrogen in chromium

Abstract

Publication series

Conference

Other files and links

Fingerprint

Cite this