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Effect of Low Transformation Temperature Welding Consumable on Microstructure, Mechanical Properties and Residual Stress in Welded Joint of A516 Carbon Steel
Sungki Choi, Junsang Lee, Jae-Yik Lee, Seung-Kyun Kang, Young-Cheon Kim, Seung-Joon Lee, Dongil Kwon
Korean J. Met. Mater. 2021;59(8):524-532.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.524

Abstract
The microstructure, mechanical properties and residual stress of flux-cored arc welded ASTM A516-70N carbon steel using a Mn-based low-temperature transformation (LTT) welding consumable were investigated. Microstructural analysis with X-ray diffraction, an electron backscattered diffractometer and a field-emission scanning electron microscope showed that the LTT weld metal was made up of..... More

                           Cited By 1
Improvement of Wear Resistance in Laser Shock-Peened Copper Contacts
Donghyuck Jung, Changkyoo Park, Eun-Joon Chun, Yoon-Jun Kim
Korean J. Met. Mater. 2020;58(8):560-565.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.560

Abstract
This study investigated the influence of laser shock peening without coating (LSPw/oC) on the degradation of copper electrical contacts. A theoretical calculation of the plastic-affected depth (PAD) induced by LSPw/oC was performed, based on the laser-induced plasma pressure along with the Hugoniot elastic limit of our LSPw/oC experimental conditions. The..... More

                           Cited By 3
A Further Study on Knoop Indentation Plastic Deformation for Evaluating Residual Stress
Woojoo Kim, Kyungyul Lee, Jong-hyoung Kim, Young-Cheon Kim, Dongil Kwon
Korean J. Met. Mater. 2020;58(8):515-521.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.515

Abstract
A method for evaluating residual stress using an instrumented indentation test was developed some decades ago. More recently, another method was developed, using a Knoop indenter. The conversion factor ratio, which is one of the key factors in the evaluation algorithm, has been taken to be 0.34, although this value..... More

                           Cited By 1
Effect of a Metal Thin Film's Residual Stress and Manufacturing Process on Thin Film Micro-Crack
박막 잔류응력 및 제조공정에 따른 금속박막층 미세크랙 영향
Byung-Kyu Cho, Seung-Chan Hong, Byung-Sam Kim, Jae-Kyung Cheon
조병규, 홍승찬, 김병삼, 천재경
Korean J. Met. Mater. 2020;58(3):175-181.   Published online 2020 Mar 5
DOI: https://doi.org/10.3365/KJMM.2020.58.3.175

Abstract
In recent automobile trends, the functions of opening and closing the vehicle door are accomplished by touch sensor and smart-phone NFC (Near Field Communication) systems. These convenience features are incorporated into the outdoor handle. However, this function can’t be used when chrome plating is applied to this part for design..... More

                        
Comparison of Microstructure and Residual Stress Affecting Stress Corrosion Cracking Susceptibility of Austenitic Stainless Steel Tubes
오스테나이트 스테인리스강 튜브의 응력부식균열 민감도에 영향을 미치는 미세조직 및 잔류응력 비교
Ho Jung Lee, Seungjin Oh, Hongdeok Kim
이호중, 오승진, 김홍덕
Korean J. Met. Mater. 2019;57(1):51-59.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.51

Abstract
Three 304L austenitic stainless steel feedwater heater (FWH) tubes used in pressurized water reactors (PWRs) were investigated in this study. By comparing metallurgical differences, such as microstructural features, micro-hardness, and circumferential residual stress of the failed and non-failed FWH tubes by stress corrosion cracking (SCC), factors which could affect SCC..... More

                           Cited By 4
Effects of Annealing on Structure and Magnetic Properties of Fe-Si-Al Flakes
Pyungwoo Jang
Korean J. Met. Mater. 2018;56(9):680-685.   Published online 2018 Sep 5
DOI: https://doi.org/10.3365/KJMM.2018.56.9.680

Abstract
This study elucidates the effects of annealing on the properties of Fe-Si-Al flakes. The changes of the DO3 phase, the lattice parameter and the grain size of the flakes were analyzed by X-ray peak broadening and shift. Static magnetic properties, namely, coericivity and saturation magnetization, were analyzed by a vibration..... More

                           Cited By 2
Evaluation on Reheat Cracking of Multi-pass Weld Metal of YP 690 QT Steel
해양플랜트용 YP 690 MPa급강 다층 용접부의 재열 균열 특성 평가
Yong Taek Shin, Young Ju Jo
신용택, 조영주
Korean J. Met. Mater. 2018;56(8):580-588.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.580

Abstract
This study evaluated the relationship between reheat cracking that occurs in the reheated weld zone formed by subsequent multi-pass welding and the preheat/interpass temperature. The multi-pass weldment was YP 690 MPa high-strength steel, which is used in mobile offshore platform units. The welding process was flux-cored arc welding (FCAW), which..... More

                        
Enhanced Resistance to Delayed Cracking in Deep-drawn Lean Duplex Stainless Steel: the Role of Residual Stress
Seok Hwan Jung, Taekyung Lee, Seok Weon Song, Young Jin Kwon, Hyung-Gu Kang, Dongchul Chae, Chong Soo Lee
Korean J. Met. Mater. 2017;55(8):544-549.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.544

Abstract
The delayed cracking behavior of deep-drawn lean duplex stainless steel (LDSS) was investigated, and compared with that of conventional metastable austenitic stainless steels (MASS). Hydrogen charging was performed by electrochemical method, and the hydrogen-charged specimens were subjected to the slow-strain-rate test. Fractures occurred along the phase boundaries in the LDSS,..... More

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