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

• Published in: International journal of minerals, metallurgy and materials Vol. 24; no. 11; pp. 1267 - 1277
• Main Authors: Shiran, Mohammadreza Khanzadeh Gharah, Khalaj, Gholamreza, Pouraliakbar, Hesam, Jandaghi, Mohammadreza, Bakhtiari, Hamid, Shirazi, Masoud
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.11.2017; Springer Nature B.V; Center for Advanced Engineering Research, Majlesi Branch, Islamic Azad University, Isfahan 8631656451, Iran%Young Researchers and Elite Club, Saveh Branch, Islamic Azad University, Saveh 3919715179, Iran%Young Researchers and Elite Club, Science and Research Branch, Islamic Azad University, Tehran 1477893855,Iran%Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad 8514143131, Iran
• Subjects: Aluminum; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; compounds; Corrosion and Coatings; distance; explosive; Explosive welding; Glass; heat; Heat treatment; intermetallic; Intermetallic compounds; Light microscopy; Materials Science; mechanical; Mechanical properties; Metallic Materials; Microhardness; Microscopy; Natural Materials; Optical microscopy; properties; Stainless steel; Stainless steels; stand-off; Strength testing; Surfaces and Interfaces; Tensile strength; Thickness; Thin Films; treatment; Tribology; welding; intermetallic compounds; heat treatment; stand-off distance; mechanical properties; explosive welding
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-017-1519-x

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.