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Table of Contents | May, 2018  Vol. 56   No.5 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
335 Microstructural Evolution in Cast and HIP’ed Ingot Material of Beta Gamma TiAl Alloy by Two Step Cooling
Cast 와 HIP 으로 제작된 베타 감마 TiAl 합금의 열처리 후 2단계 냉각법을 통한 미세구조의 변화
Kwangsu Choi, Jeong Min Kim, Joon Sik Park, Young-won Kim
최광수, 김정민, 박준식, 김영원
Korean J. Met. Mater. 2018;56(5):335-341.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.335

The beta gamma alloys of Ti - 43.8Al - 4Nb - 2Cr - 0.2B - 0.2C at % (9CN) were prepared using induction skull melted (ISM) cast ingots. In order to make a fine fully lamellar structure with some minor phases, two step cooling was performed using two furnaces after..... More

       Crossref 3
342 Microstructure and Mechanical Properties of 17-4PH Steel and Fe-Cr-B Alloy Mixed Material Manufactured Using Powder Injection Molding
Powder Injection Molding 공정으로 제조된 17-4PH 강과 Fe-Cr-B 합금 복합 소재의 미세조직 및 기계적 특성
Yeun-Ah Joo, Young-Kyun Kim, Tae-Sik Yoon, Kee-Ahn Lee
주연아, 김영균, 윤태식, 이기안
Korean J. Met. Mater. 2018;56(5):342-349.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.342

This study investigated the microstructure and mechanical properties of 17-4PH precipitation hardened martensite stainless steel and Fe-Cr-B based alloy mixed material manufactured using powder injection molding. 17-4PH stainless steel powder was mixed with 5 wt%, 10 wt% and 20 wt% Fe-Cr-B based alloy (M alloy) powder to manufacture three different..... More

       Crossref 5
350 High-temperature Oxidation of Hot-dip Aluminized 2.25Cr-1Mo Steel
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater. 2018;56(5):350-359.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.350

When 2.25Cr-1Mo steel was hot-dip aluminized, a coating consisting of (Al-rich topcoat)/(Al13Fe4 layer)/(Al5Fe2 layer) formed. With increment of oxidation temperature, the transform of Al→Al13Fe4→Al5Fe2→AlFe→AlFe3→α-Fe(Al)→α-Fe occurred through interdiffusion between the coating and the substrate as follows. The oxidation at 700 oC changed the coating to (α-Al2O3 scale)/(α-Al2O3, Al13Fe4, Al5Fe2)-mixed layer)/(Al5Fe2 layer)/(AlFe..... More

       Crossref 2
360 Effect of Carrier Gas on Microstructure and Macroscopic Properties of Tantalum Coating Layer Manufactured by Kinetic Spray Process
Kinetic spray 공정으로 제조된 탄탈럼 코팅층의 미세조직 및 물성에 미치는 송급 가스의 영향
Ga-Ryung Kim, Young-Kyun Kim, Hyung-Jun Kim, Kee-Ahn Lee
김가령, 김영균, 김형준, 이기안
Korean J. Met. Mater. 2018;56(5):360-365.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.360

This study attempted to utilizing the kinetic spray process to manufacture tantalum coating layer and investigated the effect of carrier gas on the microstructure and macroscopic properties of the coating layer. The initial powder feed stock was a massive powder with an average particle size of 24.35 μm and 99.99%..... More

       Crossref 1
366 Effect of Sn Content on Filler and Bonding Characteristics of Active Metal Brazed Cu/Al2O3 Joint
Jioh Shin, Ashutosh Sharma, Do-hyun Jung, Jae Pil Jung
Korean J. Met. Mater. 2018;56(5):366-374.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.366

This study examined the effects of the Sn content in a pure active metal filler Ag-Cu-Ti for the brazing of a Cu/ Al2O3 joint. The optimal content of Sn to effectively wet alumina was 5 wt%. The microstructure of the brazed joint showed the presence of an Ag-rich matrix and..... More

       Crossref 13
375 Characterization of Microstructures and Creep Fracture Characteristics of Dissimilar Metal Welds between Inconel 740H Ni-Based Superalloy and Gr.92 Ferritic Steel
니켈기 Inconel 740H 초내열합금과 고Cr계 Gr.92 내열강의 이종금속 용접부의 미세조직 및 크리프 파단 특성
Kyeong-Yong Shin, Ji-Won Lee, Jung-Min Han, Kyong-Woon Lee, Byeong-Ook Kong, Hyun-Uk Hong
신경용, 이지원, 한정민, 이경운, 공병욱, 홍현욱
Korean J. Met. Mater. 2018;56(5):375-383.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.375

Microstructure evolution and the creep fracture characteristics of dissimilar welds between Ni-based superalloy Inconel 740H and High Cr ferritic steel Gr.92 were investigated. The dissimilar welds were fabricated by shielded metal arc (SMA) welding process with Ni-based austenitic Inconel 182 superalloy. Postweld heat treatment at 760 oC for 4 hours..... More

       Crossref 6
384 Modification of the Amount of CH4 Supplied for the Efficient CH4 Reduction of SnO2
Taeyang Han, Youhan Sohn, Hyunwoo Ha, Mi Yoo, Sangyeol Kim, Sang-ro Lee, Hyun You Kim, Jun Hyun Han
Korean J. Met. Mater. 2018;56(5):384-391.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.384

The methane reduction (MR) of SnO2 has been proposed as a highly efficient method for recovering Sn from SnO2 containing industrial wastes. The MR of SnO2 also produces a mixture of H2 and CO, which can be further utilized as a syngas for the production of various fuels through the..... More

       Crossref 2
392 Development of a Mg-Based Alloy with a Hydrogen-Storage Capacity of 7 wt% by Adding a Polymer CMC via Transformation-Involving Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
Korean J. Met. Mater. 2018;56(5):392-399.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.392

The addition of CMC (Carboxymethylcellulose, Sodium Salt) may improve the hydriding and dehydriding properties of Mg since it has a relatively low melting point and the melting of CMC during transformation-involving milling may put the milled samples in good states to absorb and release hydrogen rapidly. Samples with compositions of..... More

       Crossref 6
400 A Study of Silicon Crystallization Dependence upon Silicon Thickness in Aluminum-induced Crystallization Process
Doo Won Lee, Muhammad Fahad Bhopal, Soo Hong Lee
Korean J. Met. Mater. 2018;56(5):400-405.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.400

Aluminum-induced crystallization(AIC) is one of the ways to improve characteristics of thin-film poly-crystalline (TFPC) silicon solar cell since it shows large grain size and good properties for TFPC silicon solar cell. In AIC process, aluminum is firstly deposited on foreign substrate. Then, silicon is deposited on aluminum. Annealing was done..... More

       Crossref 1
406 Evaluations of Hydrogen Permeation on Ni-SCYb Nano-Composites Membrane by Sol-Gel Methods
Min Gyeom Kim, Tae Whan Hong
Korean J. Met. Mater. 2018;56(5):406-411.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.406

Industrially meaningful hydrogen production process from mixture or syngas certainly must have a cooling process, which is typically pressure swing adsorption (PSA). However, the PSA process involves an exothermic reaction during adsorption. Recently, hydrogen separation research has been in progress in order to develop a cooling process to minimize or..... More

       Crossref 1
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