열간 압연된 AZMX1100 합금의 기계적물성에 미치는 열처리 영향 (Effect of Heat Treatment on the Mechanical Properties of Hot-rolled AZMX1100 Alloy)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 63권 / 4호 / 305 ~ 317페이지
· 저자명 : 박태연, 최인철

초록

In this study, to investigate the evolution of microstructure and texture, as well as their effect onmechanical properties of AZMX1100 magnesium alloy, AZMX1100 plates were manufactured using the TRC(Twin roll casting) method, which is one of the continuous casting methods With TRC it is possible to reducethe segregation of magnesium alloys, improve the size and distribution of inclusions, and refine grain throughrapid cooling. In the TRC-processed HR(0PASS) plate, coarse grains with an average size of 131.3 ± 80.68μm were observed. Through hot rolling, the grain size was not only significantly refined to 8.58 ± 4.89 μm,primarily due to dynamic recrystallization (DRX) which not only reduced the average grain size, but alsoweakened the texture intensity. After either homogenization or aging heat treatment followed by hot rollingprocess, the grain size increased by over twofold. This occurred due to the combined effects of recrystallizedgrain growth and the high stored deformation energy during rolling. Although the mechanical strengthimproved progressively with hot rolling due to work hardening and grain refinement in the HR(8PASS)specimen, homogenization heat treatment led to grain growth, resulting in the lowest Vickers hardness andtensile strength in the HR(8PASS)-N specimen. The specimen HR(8PASS)-T6, processed using T6 heattreatment, demonstrated superior mechanical strength with the ultimate tensile strength of 268.3 MPa ± 3.7and the yield strength of 184.3 MPa ± 2.2. This enhancement in ductility was attributed to the broaddispersion of texture along the transverse direction (TD) and rolling direction (RD) after heat treatment, whicheffectively reduced anisotropy during tensile deformation.

영어초록

In this study, to investigate the evolution of microstructure and texture, as well as their effect onmechanical properties of AZMX1100 magnesium alloy, AZMX1100 plates were manufactured using the TRC(Twin roll casting) method, which is one of the continuous casting methods With TRC it is possible to reducethe segregation of magnesium alloys, improve the size and distribution of inclusions, and refine grain throughrapid cooling. In the TRC-processed HR(0PASS) plate, coarse grains with an average size of 131.3 ± 80.68μm were observed. Through hot rolling, the grain size was not only significantly refined to 8.58 ± 4.89 μm,primarily due to dynamic recrystallization (DRX) which not only reduced the average grain size, but alsoweakened the texture intensity. After either homogenization or aging heat treatment followed by hot rollingprocess, the grain size increased by over twofold. This occurred due to the combined effects of recrystallizedgrain growth and the high stored deformation energy during rolling. Although the mechanical strengthimproved progressively with hot rolling due to work hardening and grain refinement in the HR(8PASS)specimen, homogenization heat treatment led to grain growth, resulting in the lowest Vickers hardness andtensile strength in the HR(8PASS)-N specimen. The specimen HR(8PASS)-T6, processed using T6 heattreatment, demonstrated superior mechanical strength with the ultimate tensile strength of 268.3 MPa ± 3.7and the yield strength of 184.3 MPa ± 2.2. This enhancement in ductility was attributed to the broaddispersion of texture along the transverse direction (TD) and rolling direction (RD) after heat treatment, whicheffectively reduced anisotropy during tensile deformation.

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