Investigation on the Unlubricated Sliding Tribological Properties of Ti–20Zr–6.5Al–4V Alloy at Elevated Temperatures

Hyung Lae Kim; Sung Hwan Bang; Jong Min Choi; Nae Hyung Tak; Sang Won Lee; Sung Hyuk Park

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자료유형: 학술저널

저자정보: Hyung Lae Kim (Korea Atomic Energy Research Institute (KAERI)) Sung Hwan Bang (Seoul National University) Jong Min Choi (Hyundai-Steel) Nae Hyung Tak (Korea Research Institute of Standards and Science) Sang Won Lee (Kyungpook National University) Sung Hyuk Park (Kyungpook National University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.12

발행연도: 2020.1

수록면: 1,757 - 1,765 (9page)

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Oil country tubular goods (OCTG) steels with a low yield ratio (yield strength/tensile strength) and excellent impact toughnesshave recently been demanded to ensure mining performance and safety. From this viewpoint, the optimization of themanufacturing conditions is important because they influence the microstructure and mechanical properties of the steels; inparticular, in the case of OCTG steels with carbon contents greater than 0.2 wt%, the finishing mill temperature (FMT) andcoiling temperature (CT) strongly affect the microstructure of the final products, which are generally composed of ferriteand pearlite phases. In this study, 0.39C-0.23Si-1.56Mn-0.11Cr steel plates were fabricated under various FMT and CTconditions and their yield strength, tensile strength, and impact energy were investigated. In addition, pipes with diametersof 244 and 508 mm were manufactured via an electric resistance welding method using two of these strips fabricated undertwo different optimized conditions [(1) FMT = 880 °C and CT = 630 °C and (2) FMT = 800 °C and CT = 690 °C] to analyzethe change in mechanical properties induced by the work-hardening effect during the piping process. The results revealedthat the FMT and CT are closely related to the volume fraction of the ferrite phase, the grain size and lamellar spacing of thepearlite phase, and the tensile and impact properties of the steel strips; the variations in the microstructure and mechanicalproperties with the FMT and CT were also discussed in detail.

#OCTG · Medium-carbon steel · Coiling temperature · Finishing mill temperature · Microstructure

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