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Mod. 440A 마르텐사이트계 스텐인리스강의 공식에 미치는 탄화물의 영향
권순두,허성화,강창룡,Kwon, Soon-Doo,Heo, Sung-Hwa,Kang, Chang-Yong 한국재료학회 2015 한국재료학회지 Vol.25 No.12
In this study, we investigated the effect of the residual carbides and tempered carbides precipitated by tempering treatment after quenching on the pitting corrosion of mod. 440A martensitic stainless steel. In quenched specimens and tempered specimens after quenching of mod. 440A martensitic stainless steel, the volume fraction of the residual carbides and total carbides decreased with the increase of the austenitizing temperature. Pitting resistance increased with the increase of austenitizing temperature. With the increase of the volume fraction of the residual and total carbides, the pitting resistance of mod. 440A martensitic stainless steel was decreased. The pitting resistance of mod. 0.5C-17Cr-0.5Ni 440A martensitic stainless steel had stronger affected by residual carbides than precipitated carbides produced by tempering.
Effect of Welding Process on Microstructure and Impact Toughness of Welds in High Nitrogen TiN Steel
권순두,정상훈 대한용접접합학회 2023 대한용접·접합학회지 Vol.41 No.6
The effect of welding process on the microstructure and impact toughness of high-nitrogen TiN EH36-TM steels was evaluated. In the weld metals of SSAW and TSAW, GBF was created along PAGB, and AF and a small amount of PF were observed in the grain. In TSAW with low basicity and high heat input, GBF was remarkably developed, and intragranular AF was more coarse. In the EGW weld metal, GBF was hardly generated and composed of intragranular AF and PF. As the heat input increased, the size of PAGB was increased and PF was developed at the FL, and in FL+1, the grain size of AF and PF was coarsened. Meanwhile, the FL of EGW showed a similar size without grain size growth compared with FL+5. Among the three welding processes applied, weld metals of SSAW and EGW well met the values required by the classification for the EH36 steel, but the weld metal of TSAW was insufficient. HAZ of high-nitrogen TMCP steels satisfy the value required by the classifications without significant change even when welding at various input heat conditions, and in particular, the weld metal of the high heat-input EGW showed relatively stable values from FL to FL+5.
Mid. 440A 마르텐사이트 스테인리스강의 기계적 성질에 미치는 템퍼링의 영향
권순두 ( S D Kwon ),김영철 ( Y C Kim ),강창룡 ( C Y Kanf ) 한국열처리공학회 2013 熱處理工學會誌 Vol.26 No.3
In this study, the effect of tempering treatment on the mechanical properties in modified 440A steel has been investigated The amount of remaining carbide decreased with increasing the austenitizing treatment temperature, and all carbides were completely dissoived at 1250℃.The amount of remaining carbide decreased with increasing the time of austenitizing, but the carbide remained insoluble up to 120minutes at 1050℃. With increasing the tempering temperature, tensile strength decreased, and elongation increased slowly, while hard-ness rapidly decreased, and impact value unchanged and then rapidly increased over 500℃. The strength and hardness slowly decreased, while the elongation and impact absorbed energy increased with increasing the tem-pering time Cr23C6type carbide was precipitated and sharp decrease of elongation and toughness by tempering did not appear. (Receivied March 12, 2013, Revised April 20, 2013; Accepted May 15, 2013)
Fe-26Mn-4Co-2Al 제진합금의 감쇠능에 미치는 결정립 크기의 영향
정규성,김도훈,권순두,강창룡,Jeong, Kyu-Seong,Kim, Doe-Hoon,Kwon, Soon-Doo,Kang, Chang-Yong 한국재료학회 2018 한국재료학회지 Vol.28 No.3
This study was carried out to investigate the effect of grain size on the damping capacity of the Fe-26Mn-4Co-2Al damping alloy. ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ were formed by cold working, and these martensites were formed with a specific direction and surface relief. With an increase in grain size, the volume fraction of ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ increased by decrement the austenite phase stability. This volume fraction more rapidly increased in cold-rolled specimen than in the specimen that was not cold-rolled. The damping capacity also increased more with the augmentation an increased grain size and more rapidly increased in cold-rolled specimen than in the specimen that was not cold rolled. The effect of grain size on the damping capacity was larger in the cold-rolled specimen than the specimen that was not cold-rolled. Damping capacity linearly increased with an increase in volume fraction of ${\varepsilon}-martensite$. Thus, the damping capacity was affected by the ${\varepsilon}-martensite$.