Influence of Microstructural Changes on Residual Stress Characteristics and Macro-Hardness of Submerged Arc Welded P-91 Steel Plates

Sodagem & inspecao

article

Raja Chakrabarti¹  Joydeep Roy²  Pankaj Biswas³  Subhas Chandra Saha² 

[1] Tripura Institute of Technology, Department of Mechanical Engineering;National Institute Technology Agartala, Department of Mechanical Engineering;Indian Institute Technology Guwahati, Department of Mechanical Engineering

关键词: Ferritic-martensitic alloy steel;    Weld zone;    Heat-affected zone;    Microstructure;    Martensite phase transformation;    Macro-hardness;    Welding residual stresses;   

DOI  :  10.1590/0104-9224/SI26.01

学科分类：工程和技术（综合）

来源: Associacao Brasileira de Soldagem

【 摘 要 】

In this study, the submerged arc welded butt joint of P-91 ferritic-martensitic alloy steel plates has been chosen to examine the influence of microstructural changes on welding residual stress characteristics and macrohardness in the weldment with two different heat input 2497.5 J/mm & 2040J/mm respectively. The stress magnitudes at a different location on the welded specimen are measured by X-ray diffraction technique at the postweld heat-treated condition. Compressive stresses are observed in the weld zone (WZ) and tensile stresses are detected at the boundary of the heat-affected zone (HAZ) near the weld zone. Higher compressive stresses are found in the weld zone of both the specimens where maximum hardness values are observed. Different grain matrix in the microstructure contributes significantly towards the quality of weldment. Residual stress, as well as the hardness of weldment, is found to be influenced by the martensite phase transformation and dissolution of precipitates. A modeling concept is presented for dimensional analysis of martensite structure. Energy dispersive X-ray indicates the distribution of carbides at the grain boundaries. Optical micrograph substantiates the presence of δ-ferrite in the WZ.

【 授权许可】

CC BY-NC