Effect of the Vacuum Heat Treatment on the Microstructure and Mechanical Properties of the Galvanized-Q235/AZ91D Bimetal Material Produced by Solid–Liquid Compound Casting

Jun Cheng; Jian‑hua Zhao; Dengzhi Zheng; Ke He; Yu Guo

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자료유형: 학술저널

저자정보: Jun Cheng (Chongqing University) Jian‑hua Zhao (Chongqing University) Dengzhi Zheng (Chongqing University) Ke He (Chongqing University) Yu Guo (Chongqing University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.3

발행연도: 2021.1

수록면: 545 - 555 (11page)

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The galvanized-Q235/AZ91D bimetallic material was achieved via solid–liquid compound casting, and the effect of theheat treatment at 250 °C for 3 h on the microstructure and mechanical properties of the galvanized-Q235/AZ91D bimetallicmaterial were investigated. The interface zone in the galvanized-Q235/AZ91D was composed of three different layers whichwere the FeAl3+ α-Mg, (α-Mg + MgZn), and α-Mg + (α-Mg + MgZn) from the galvanized-Q235 to AZ91D, successively. After the heat treatment, the (α-Mg + MgZn) eutectic structure was transformed into Al5Mg11Zn4to promote the microhardnessfrom 139.2 HV to reach 298.8 HV. In addition, the α-Mg and (α-Mg + Mg12Al17) eutectic structure in AZ91D wereseparately transformed into (α-Mg + Al5Mg11Zn4) and Al5Mg11Zn4resulting in the increasement of microhardness, from59.5 to 173.4 HV and 294.2 HV, respectively. Moreover, the interfacial shear strength was changed from 11.23 to 24.63 MPadue to the formation of Al5Mg11Zn4and the vanishment of MgZn.

#Solid–liquid compound casting · Heat treatment · Microstructure · Interface zone · Hot-dip galvanizing · Shear strength · Microhardness

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