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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.
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 ${\varepsilon}-martensite$.
열가공제어한 저탄소강의 용접부 기계적성질에 미치는 용접기법의 영향
엄정호(Jung-Ho Eom),정상훈(Sang-Hoon Jeong),권순두(Soon-Doo Kwon) 한국산업기술융합학회(구. 산업기술교육훈련학회) 2024 산업기술연구논문지 (JITR) Vol.29 No.1
고효율 용접 기법에 따른 TMCP강의 기계적 성질을 연구한 결과 다음과 같은 결론을 얻을 수 있다. SSAW(Single SAW) 및 TSAW(Tandem SAW)의 WM(Weld Metal)에서는 PAGB(Prior Austenite Grain Baoundary)를 따라 GBF(Grain Boundary Ferrite)가 생성되고 그 측면에서 FSP(Ferrite Side Plate)가 발달하는 모습이 관찰되며, 특히 염기도가 낮고 입열량이 높은 TSAW는 더욱 조대하게 나타난다. 한편, EGW(Electro Gas Welding)의 WM에서는 GBF 및FSP는 거의 관찰되지 않고 미세한 입내 AF(Acicular Ferrite) 및 PF(Polygonal Ferrite)가 관찰된다. HAZ(Heat Affected Zone)에서는 입열량이 높아질수록 B(Bainite), AF와 같은 저온 변태상의 분율이 감소하고 GBF 및 FSP, PF 등과 같은 초석페라이트의 분율이 증가하는 경향이 나타나며, 또한 결정립 크기도 조대화되는 경향을 나타낸다. WM의 경도는 입열량과 무관하게 EGW, SSAW, TSAW 순으로 높게 나타나며, HAZ의 경도는 입열량이 높아질수록 연화폭이깊어지고 최저값 또한 낮아지는 경향을 나타낸다. 입열량이 증가할수록 용접부의 이음강도가 낮아지는 경향이 나타나지만, 적용된 모든 용접기법의 용접부 이음강도는 모재에서 요구되는 값 이상을 만족하는 결과를 나타낸다. This study investigated the mechanical properties of thermal mechanical control process steel and obtained the following results. In a welded metal (WM) subjected to both single submerged arc welding (SSAW) and tandem SAW (TSAW), grain boundary ferrite (GBF) was generated along with a prior austenite grain boundary and ferrite side plate (FSP). In particular, TSAW with low basicity and a high heat input yielded coarser results than those of SSAW. In the heat affected zone (HAZ), as the heat input increased, the fraction of low-temperature transformation products such as bainite and acicular ferrite decreased, whereas the fraction of primary ferrites such as GBF, FSP, and polygonal ferrite (PF) tended to increase, and the grain size tended to coarsen. The hardness value of the WM increased in the order of electro gas welding, SSAW, and TSAW regardless of the heat input, and the hardness value of the HAZ tended to increase the softening width and decrease the minimum value with an increase in the heat input. Finally, the joint strength of the weld zone tended to decrease as the heat input increased. However, the joint strength of the weld zone under all the applied welding techniques met the value required by the base metal.