Microstructural correlation of hardness profile in martensitic stainless steel weldment
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Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
Abstract
The correlation between microstructures and
hardness profiles in low carbon martensitic stainless steel
girth weldment were investigated. Optical microscopy and
a scanning electron microscope equipped with electron
back scatter diffraction system were used for assessment of
microstructural phases, grain sizes, and grain misorientation
across the weldment. The hardness value fluctuated
between the peak and lowest values in the heat-affected
zone of the weldment. The hardness profile observed is
consistent with microstructural evolution across the weldment.
The low hardness value observed in the weld metal
was attributed to the large proportion of ferrite introduced
by the superduplex filler metal used for the fabrication and
grain coarsening caused by prolonged cooling of the weld
metal. The electron backscatter diffraction data showed
that higher grain sizes occurred in the weld metal and this
is consistent with the highest degree of misorientation and
recrystallisation observed in the weld metal than parent and
HAZ region of weldment.
Description
Keywords
EBSD, Hardness, HAZ, Martensitic, Pipe steel, Weld