Metallurgical and Materials Transactions A

, Volume 47, Issue 12, pp 6138–6147 | Cite as

The Effect of Dilution on Microsegregation in AWS ER NiCrMo-14 Alloy Welding Claddings

  • Émerson Mendonça Miná
  • Yuri Cruz da Silva
  • Jean Dille
  • Cleiton Carvalho Silva
Article
First Online:
Received:

Abstract

Dilution and microsegregation are phenomena inherent to claddings, which, in turn, directly affect their main properties. This study evaluated microsegregation in the fusion zone with different dilution levels. The overlays were welded by the TIG cold wire feed process. Dilution was calculated from the geometric characteristics of the claddings and from the conservation of mass equation using chemical composition measurements. Microsegregation was calculated using energy dispersive X-ray spectroscopy measurements of the dendrites and the chemical composition of the fusion zone. The dilution of the claddings was increased by reducing the wire feed rate. Fe showed potential to be incorporated into the solid phase (k > 1), and this increased with the increase of dilution. Mo, in turn, was segregated into the liquid phase (k < 1) and also increased with the increase of dilution. However, Cr and W showed a slight decrease in their partition coefficients (k) with the increase of dilution.

Keywords

Weld Metal Heat Input Weld Pool Fusion Zone Filler Metal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

Swf

Wire feeding speed

WA

Weave amplitude

D

Dilution

ABM

Area of the base metal

AFM

Area of filler metal

CFZ

Concentration of Fe in the fusion zone

CBM

Concentration of Fe in the base metal

CFM

Concentration of Fe in the filler metal

CS

Composition of the solid

C0

Composition of the liquid

γ

Austenite phase

σ

Sigma phase

µ

Mu phase

fS

Fraction of the solid

k

Partition coefficient

α

Fourier diffusion number

\( \frac{\partial T}{\partial t} \)

Cooling rate

ts

Time of solidification

Ds

Diffusion coefficient

L

Half of the dendritic spacing

λ

Thermal conductivity

Sw

Welding speed

T

Temperature of beginning of solidification

T0

Pre-heating and/or interpass temperature

na

Electric arc efficiency

V

Voltage

I

Current

Ts

Solidification range

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Notes

Acknowledgments

The authors would like to thank the Welding Research Technology Laboratory of the Federal University of Ceará (UFC); The Analytical Center of the UFC, project CT-INFRA/MCTI-SISNANO/PRÓ-EQUIPAMENTOS CAPES, for allowing the use of its electron scanning microscope for the analyses and the agencies PETROBRAS, FUNCAP, CNPq, FINEP, and CAPES that provided financial support to this study as well as undergraduate and Master’s scholarships.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Émerson Mendonça Miná
    • 1
  • Yuri Cruz da Silva
    • 1
  • Jean Dille
    • 2
    • 3
  • Cleiton Carvalho Silva
    • 1
  1. 1.Department of Metallurgical and Materials EngineeringUniversidade Federal do CearáFortalezaBrazil
  2. 2.Matters and Materials DepartmentUniversité Libre de BruxellesBrusselsBelgium
  3. 3.Federal University of Rio de JaneiroRio de JaneiroBrazil

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