自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 8    August 2018

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Effect of postweld heat treatment on interface microstructure and metallurgical properties of explosively welded bronze–carbon steel
Khanzadeh GharahShiran Mohammad Reza1, Khoshakhlagh Ali2,Khalaj Gholamreza3, Bakhtiari Hamid4, Banihashemi Ali Reza5

1. Center for Advanced Engineering Research, Majlesi Branch, Islamic Azad University, Isfahan, Iran;
2. Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran;
3. Young Researchers and Elites Club, Saveh Branch, Islamic Azad University, Saveh, Iran;
4. Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;
5. Department of Materials Engineering, Shahreza Branch, Islamic Azad University, Shahreza, Iran

Abstract:The effects of postweld heat treatment on the microstructure and metallurgical properties of a bronze–carbon steel (st37) explosively bonded interface were studied. Explosive welding was done under 1.5- and 2-mm standoff distances and different conditions of explosive charge. Samples were postweld heat treated for 4 and 16 h in the furnace at 250 °C and 500 °C and then air cooled. Laboratory studies using optical microscopy, scanning electron microscopy, and microhardness testing were used to evaluate the welded samples. Microstructural examinations showed that by increasing the standoff distance and the explosive charge, the interface of bronze to steel became wavier. The microhardness test result showed that the hardness of the samples was higher near the joint interface compared with other areas because of the intensive plastic deformation, which was caused by the explosion force. The results show that increasing the heat treatment temperature and time caused the intermetallic compounds’ layer thickness to increase, and, because of the higher diffusion of copper and tin, the iron amount in the intermetallic compounds decreased. Also, because of the increase in heat treatment temperature and time, internal stresses were released, and the interface hardness decreased.

 

Key words: heat treatment; explosive welding; intermetallic compound; standoff distance; diffusion layer

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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