Influence of Austempering Temperature and Time on the Microstructure and Mechanical Properties of Ductile Iron Weldment Using Developed Coated Electrode View Full Text


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Article Info

DATE

2019-03-22

AUTHORS

T. Sarkar, Ajit Kumar Pramanick, S. K. Sahoo, T. K. Pal, Akshay Kumar Pramanick

ABSTRACT

Sound welded joints of ductile iron were first made by developing coated electrodes as well as weld procedure. The weldments were then austenitized at 900 °C for 2-h holding time followed by austempering at 300 and 350 °C for three different holding times (1.5, 2 and 2.5 h) at each austempering temperature. The influence of austempering temperature and time on the microstructural and mechanical properties was studied. Microstructural characterization, phase analysis, microhardness and mechanical properties were performed to understand the effect of austempering heat treatment on microstructure, austempering kinetics and mechanical properties of welded joints. In spite of significant variation in microstructures among all the three zones of DI weldment before austempering, the response of both weld metal and HAZ to austempering heat treatment similar to a base metal was noted. However, a significant variation in matrix structures (bainitic ferrite, retained austenite) as well as graphite nodules among the three zones was observed with changing the austempering temperature and holding time. Also, 100% joint efficiency of the welded joints was achieved at both 300 and 350 °C for 2-h holding time. Hardness and charpy impact toughness mostly depended on the volume fraction of retained austenite and carbon content. Based on the results of tensile and charpy impact testing, 350 °C and 2-h holding time could be considered as an optimum austempering condition for ADI weldment. More... »

PAGES

1-15

References to SciGraph publications

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  • 2014-02. Weldability of Ferritic Ductile Cast Iron Using Full Factorial Design of Experiment in JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
  • 2009-04. The performance of ceramic and cermet cutting tools for the machining of austempered ductile iron in THE INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
  • 2001-04. Influence of microalloying and heat treatment on the kinetics of bainitic reaction in austempered ductile iron in JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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  • 1998-12. Dependence of fracture toughness of austempered ductile iron on austempering temperature in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2005-10. Fracture behavior and mechanism in austempered ductile iron in JOURNAL OF FAILURE ANALYSIS AND PREVENTION
  • 1984-01. Slag Metal Reactions during Submerged Arc Welding of Alloy Steels in METALLURGICAL TRANSACTIONS A
  • 2000-10. Microstructural development and austempering kinetics of ductile iron during thermomechanical processing in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2000-10. A study of austenitization of SG iron in BULLETIN OF MATERIALS SCIENCE
  • 1994-01. Effect of microstructure on the fatigue strength of an austempered ductile iron in JOURNAL OF MATERIALS SCIENCE
  • 2010-10. Mechanical behaviour of an austempered ductile iron in TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
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