Abstract
AbstractThe microstructural characterizations and partitioning of carbon element in the weld heat affected zones of a commercial API 5L X60 line pipe steel were studied by applying a high speed heating and cooling dilatometry technique in the present research work. The hollow cylindrical specimens were quickly heated to 1000°C, soaked for only 5 s followed by continuous cooling to ambient temperature. Besides the construction of CCT diagram of this high strength low alloy steel using the dilatation data, the hardening response, microstructural features and carbon partitioning of weld simulated specimens were investigated. The obtained results showed that the hardening response of samples increased from 142 to 261HV10kg with increasing cooling rates. These hardening variations were attributed to the changes in microstructural features and carbon partitioning that occurred between the microconstituents present in the microstructures of weld simulated samples.
Highlights
The microstructural characterizations and parti- Microalloyed high-strength low-alloy (HSLA) weldable tioning of carbon element in the weld heat affected zones steels have been developed over the last half-century and of a commercial API 5L X60 line pipe steel were studied are widely used in applications such as offshore platforms, by applying a high speed heating and cooling dilatometry shipbuilding and the construction of pipelines for oil and technique in the present research work
The obtained results showed that the hardening chanical properties and other important issues like weldresponse of samples increased from 142 to 261HV10kg with ing, cutting, manufacturing etc. for these materials are increasing cooling rates. These hardening variations were determined and standardized by American Petroleum Inattributed to the changes in microstructural features and stitute: API [5], International Organization for Standards: carbon partitioning that occurred between the microcon- ISO [6] and other national agencies working in this field stituents present in the microstructures of weld simulated of research work
The microstructural features in reshow various heat affected zones (HAZ) including coarse- lation with the hardening variations and macrohardness grained heat affected zone (CGHAZ), fine grained heat property of API 5L X-60 steel extensively used as pipelines affected zone (FGHAZ), and inter-critical heat affected in the gas and petroleum industry was investigated under zone (ICHAZ)
Summary
Abstract: The microstructural characterizations and parti- Microalloyed high-strength low-alloy (HSLA) weldable tioning of carbon element in the weld heat affected zones steels have been developed over the last half-century and of a commercial API 5L X60 line pipe steel were studied are widely used in applications such as offshore platforms, by applying a high speed heating and cooling dilatometry shipbuilding and the construction of pipelines for oil and technique in the present research work. The microstructural features in reshow various heat affected zones (HAZ) including coarse- lation with the hardening variations and macrohardness grained heat affected zone (CGHAZ), fine grained heat property of API 5L X-60 steel extensively used as pipelines affected zone (FGHAZ), and inter-critical heat affected in the gas and petroleum industry was investigated under zone (ICHAZ). These regions form adjacent to the weld de- various cooling conditions by using a high-speed heating posit as a result of being heated to temperatures ≥1200, and cooling automatic dilatometer. This is due to the formation of prior coarse-grained austenite [23] in the CGHAZ of welded steels, which subsequently 2 Materials and Experimental transform to plate-like bainitic ferrite matrix associated with some martensite/austenite islands during cooling
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