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Effect of joint clearance and post-braze heat treatment on the microstructure of joints with BNi-4 filler metal and 4130 steel

Etemadi, A. R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. Publisher: 2012
  3. Abstract:
  4. In this work, the influence of the clearance and post-braze heat treatment on the microstructure of 4130 steel joint brazed by BNi-4 filler metal was investigated. Samples with different clearances were heated to 1100°C and hold for 9 min. Then, some were reheated to 800°C(2hr) and 800°C(2hr)+1000°C(2hr), cycle 1 and cycle 2, respectively. Microscopy techniques and micro-hardness test were used to evaluate the microstructures. Results suggested that in this case 25μm clearance can be considered as the optimum value. Also, it was found that high temperature post-braze heat treatment can be applied as a useful technique for decreasing the fraction of the brittle phases at the joint main body
  5. Keywords:
  6. 4130 steel ; BNi-4 filler metal ; Joint clearance ; Post-braze heat treatment ; High temperature ; Microhardness tests ; Microscopy technique ; Optimum value ; Steel joints ; Filler metals ; Heat treatment ; Microstructure ; Brazing
  7. Source: IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference ; 2012 , Pages 410-413 ; 9781615039753 (ISBN)
  8. URL: http://www.asminternational.org/search/-/journal_content/56/10192/CP2012IBSC410/PUBLICATION