Joining of 14YWT and F82H by friction stir welding

D. T. Hoelzer; K. A. Unocic; M. A. Sokolov; Z. Feng

doi:10.1016/j.jnucmat.2013.04.027

Joining of 14YWT and F82H by friction stir welding

D. T. Hoelzer, K. A. Unocic, M. A. Sokolov, Z. Feng

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Abstract

Friction stir welding was investigated for joining specimens of the ODS 14YWT ferritic alloy together and to an F82H tempered martensitic steel plate. The FSW run was performed using a polycrystalline boron nitride tool and resulted in good bonding between 14YWT/14YWT and 14YWT/F82H. Joints and interfaces were observed by light microscopy and SEM analysis to be narrow in width. The ultra-small grain size of 14YWT increased by a factor up to 4 while that of F82H decreased by a considerable amount in the weld zones. The TEM analysis showed no significant changes in the size of the oxygen-enriched nanoclusters in the weld zone of 14YWT. However, defects such as a wormhole on the advancing side of the weld zone in 14YWT and small pores associated with joints and interfaces were observed in the FSW sample. The hardness measurements from unaffected zone into weld zones showed ∼20% decrease in hardness for 14YWT (from ∼500 VH to ∼380 VH) and ∼100% increase in hardness of F82H (from ∼220 VH to ∼440 VH).

Original language	English
Pages (from-to)	S529-S534
Journal	Journal of Nuclear Materials
Volume	442
Issue number	1-3 SUPPL.1
DOIs	https://doi.org/10.1016/j.jnucmat.2013.04.027
State	Published - 2013

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title = "Joining of 14YWT and F82H by friction stir welding",

abstract = "Friction stir welding was investigated for joining specimens of the ODS 14YWT ferritic alloy together and to an F82H tempered martensitic steel plate. The FSW run was performed using a polycrystalline boron nitride tool and resulted in good bonding between 14YWT/14YWT and 14YWT/F82H. Joints and interfaces were observed by light microscopy and SEM analysis to be narrow in width. The ultra-small grain size of 14YWT increased by a factor up to 4 while that of F82H decreased by a considerable amount in the weld zones. The TEM analysis showed no significant changes in the size of the oxygen-enriched nanoclusters in the weld zone of 14YWT. However, defects such as a wormhole on the advancing side of the weld zone in 14YWT and small pores associated with joints and interfaces were observed in the FSW sample. The hardness measurements from unaffected zone into weld zones showed ∼20% decrease in hardness for 14YWT (from ∼500 VH to ∼380 VH) and ∼100% increase in hardness of F82H (from ∼220 VH to ∼440 VH).",

author = "Hoelzer, {D. T.} and Unocic, {K. A.} and Sokolov, {M. A.} and Z. Feng",

year = "2013",

doi = "10.1016/j.jnucmat.2013.04.027",

language = "English",

volume = "442",

pages = "S529--S534",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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T1 - Joining of 14YWT and F82H by friction stir welding

AU - Hoelzer, D. T.

AU - Unocic, K. A.

AU - Sokolov, M. A.

AU - Feng, Z.

PY - 2013

Y1 - 2013

N2 - Friction stir welding was investigated for joining specimens of the ODS 14YWT ferritic alloy together and to an F82H tempered martensitic steel plate. The FSW run was performed using a polycrystalline boron nitride tool and resulted in good bonding between 14YWT/14YWT and 14YWT/F82H. Joints and interfaces were observed by light microscopy and SEM analysis to be narrow in width. The ultra-small grain size of 14YWT increased by a factor up to 4 while that of F82H decreased by a considerable amount in the weld zones. The TEM analysis showed no significant changes in the size of the oxygen-enriched nanoclusters in the weld zone of 14YWT. However, defects such as a wormhole on the advancing side of the weld zone in 14YWT and small pores associated with joints and interfaces were observed in the FSW sample. The hardness measurements from unaffected zone into weld zones showed ∼20% decrease in hardness for 14YWT (from ∼500 VH to ∼380 VH) and ∼100% increase in hardness of F82H (from ∼220 VH to ∼440 VH).

AB - Friction stir welding was investigated for joining specimens of the ODS 14YWT ferritic alloy together and to an F82H tempered martensitic steel plate. The FSW run was performed using a polycrystalline boron nitride tool and resulted in good bonding between 14YWT/14YWT and 14YWT/F82H. Joints and interfaces were observed by light microscopy and SEM analysis to be narrow in width. The ultra-small grain size of 14YWT increased by a factor up to 4 while that of F82H decreased by a considerable amount in the weld zones. The TEM analysis showed no significant changes in the size of the oxygen-enriched nanoclusters in the weld zone of 14YWT. However, defects such as a wormhole on the advancing side of the weld zone in 14YWT and small pores associated with joints and interfaces were observed in the FSW sample. The hardness measurements from unaffected zone into weld zones showed ∼20% decrease in hardness for 14YWT (from ∼500 VH to ∼380 VH) and ∼100% increase in hardness of F82H (from ∼220 VH to ∼440 VH).

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U2 - 10.1016/j.jnucmat.2013.04.027

DO - 10.1016/j.jnucmat.2013.04.027

M3 - Article

AN - SCOPUS:84884909970

SN - 0022-3115

VL - 442

SP - S529-S534

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3 SUPPL.1

ER -

Joining of 14YWT and F82H by friction stir welding

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