Understanding room temperature deformation behavior through indentation studies on modified 9Cr-1Mo steel weldments

► Observance of lath martensite in different regions of P91B and refined microstructure in ICHAZ of P91. ► Uniform depth of indentation in P91B and variable depth of indentation in P91 weldments. ► Uniform strain rate sensitivity in P91B and variable strain rate sensitivity in P91 weldments. ► Indentation creep depths and indentation depths follow similar trends across the weldment.