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Effects of heat treatment on the intermetallic compounds and mechanical properties of the stainless steel 321–aluminum 1230 explosive-welding interface

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International Journal of Minerals,Metallurgy and Materials 2017年第11期24卷 1267-1277页

作者： mohammadreza Khanzadeh Gharah Shiran Gholamreza Khalaj Hesam Pouraliakbar mohamma dreza jandaghi Hamid Bakhtiari Masoud Shirazi Center for Advanced Engineering Research Majlesi Branch Islamic Azad University Isfahan *** Iran Young Researchers and Elite Club Saveh Branch Islamic Azad University Saveh *** Iran Young Researchers and Elite Club Science and Research Branch Islamic Azad University Tehran *** Iran Advanced Materials Research Center Faculty of Materials Engineering Najafabad Branch Islamic Azad University Najafabad *** Iran

The effects of heat treatment on the microstructure and mechanical properties of intermetallic compounds in the interface of stainless steel 321 explosively bonded to aluminum 1230 were investigated in this study. Experimental investigations were performed by optical microscopy, scanning electron microscopy, and microhardness and shear tensile strength testing. Prior to heat treatment, increasing the stand-off distance between samples from 1 to 2.5 mm caused their interface to become wavy and the thickness of intermetallic layers to increase from 3.5 to 102.3 μm. The microhardness increased from HV 766 in the sample prepared at a stand-off distance of 1 mm to HV 927 in the sample prepared at a stand-off distance of 2.5 mm; in addition, the sample strength increased from 103.2 to 214.5 MPa. Heat treatment at 450°C for 6 h increased the thickness of intermetallic compound layers to 4.4 and 118.5 μm in the samples prepared at stand-off distances of 1 and 2.5 mm, respectively. These results indicated that increasing the duration and temperature of heat treatment decreased the microhardness and strength of the interface of explosively welded stainless steel 321-Al 1230 and increased the thickness of the intermetallic region.

关键词： intermetallic compounds explosive welding heat treatment stand-off distance mechanical properties

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