Investigation of microstructure and chemical analysis along weldments AISI 410 MSS ER nicrmo-3

Abstract EN

this research work the weldability of AISI 410 martensitic stainless steels (SS) LP-blades of steam turbine joined by GTAW (gas tungsten arc welding); inconel-3 filler wire was investigated.

To study the mechanical performance and microstructural characteristics of the welded joint, the optical-microscopic and micro-hardness were applied along the cross-section of specimens, respectively.

Line/Point and EDS technique were used to predict the chemical composition of welding joint.

WDS MAP/ WDS LINK (Energy Dispersive Spectroscopy) used to know the movement of elements along the weldments.

Results showed that micro-hardness along the HAZ regions increased.

Microstructure photographs revealed γ-austenite as predominate phase along weld-metal.

X-ray image with magnification 10μm showed two phases: dendritic (dark region) and interdendrite (light region) phases.

Moreover, coarse grains appeared in HAZ zone of both weldments.

In addition, chemical composition appeared carbon aggregated at interface.