Effects of Start and Finish Cooling Temperatures on the Yield Strength and Uniform Elongation of Strain-Based API X100 Pipeline Steels

Lee, Dong Hoon; Sohn, Seok Su; Song, Hyejin; Ro, Yunjo; Lee, Chang Sun; Lee, Sunghak; Hwang, Byoungchul

doi:10.1007/s11661-018-4738-5

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…Indeed, the distinguishing methods on the variously complexed structures such as polygonal ferrite (PF), bainitic ferrite (BF), acicular ferrite (AF) and granular bainite (GB) using GOS analysis have been reported in another study. 25) The KAM plot of the PF, indicates the high-angle grain boundaries (HAGBs) consequently, the dislocation density at the grain inner side is very low (yellow colored grain). In general, the GOS analysis calculates the average misorientation angle between points within a grain and decides the grain that meets the condition as PF.…”

Section: Microstructure Characteristicsmentioning

confidence: 99%

Implementation of Exceptional Microstructures and Mechanical Properties of Structural Carbon Steel Tubes by Friction Welding

Kim¹,

Kim

Park

et al. 2022

Mater. Trans.

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In this study, friction welding was applied to carbon steel tubes at a high speed condition to achieve an eco-friendly welding process and a superior mechanical performance. Friction welding is a very efficient process for joining materials without defects, especially with joint rods or tubes. For this study, cold drawn carbon steel tubes (AISI 1020) were introduced as the base material and successfully joined by friction welding. Friction welding was performed with parameters of a burn-off length (1, 2 and 5 mm). In order to analyze the welds, the electron backscattering diffraction method was introduced and observed the grain boundary characteristic distributions such as grain size, shape and orientation. To evaluate the relationship between the mechanical properties and microstructure, Vickers microhardness and tensile tests were introduced. As a result, the yield strength of the welds significantly increased relative to the base material at all conditions, and which derived from the microstructure development like a refined acicular ferrite grains through the dynamic recrystallization during the welding. Consequently, we suggest the optimum conditions of the friction welding with the interdependence of the microstructures and mechanical properties in this study. This demonstration substantially offers the possibility of an eco-friendly environment and superior tube welding quality without any defect and harmful gases at the high speed welding process as well as at the lowest cost. This technology can be extended to mass production processes with exceptional benefits for various industries.

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Section: Microstructure Characteristicsmentioning

confidence: 99%