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Research Article

A Pathway to Improve the Microstructural Features and Mechanical Properties of the DP590 Advanced High Strength Steel Welds

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  • Received: 31 December 2019Revised: 14 June 2020Accepted: 15 June 2020Available online: 17 June 2020
  • Effect of welding current mode in resistance spot welding process (RSW) on the microstructure and mechanical properties of the advanced high strength steel dual phase 590 (DP590) sheets have been investigated. It were found that fine martensitic structure was formed in the weld zone of the sample welded by single-pulse mode, while the microstructure in the heat-affected zone consists of a very fine martensitic microstructure and rough ferrite. However, using secondary pulse mode has led to the formation of tempered Martensite in the weld zone. The maximum load and the energy absorption to failure in the samples employing the secondary pulse cycle were higher, as compared to the sample employing the single pulse mode. Based on the fractography results, using the secondary pulse mode could significantly change the mode of failure upon shear tension testing. Therefore, the obtained results are some evidence that shows the use of secondary pulse mode can improve the microstructural feature and mechanical properties of the DP590 advanced high strength steel welds.
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A Pathway to Improve the Microstructural Features and Mechanical Properties of the DP590 Advanced High Strength Steel Welds

  • 1. College of Pardis, Materials Engineering Section, Isfahan University of Technology, Isfahan 84156-83111, Iran
  • 2. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111, Iran
  • 3. Eng. & Q. of Auto Steel Division, SAIPA Group, Tehran, Iran

Abstract: Effect of welding current mode in resistance spot welding process (RSW) on the microstructure and mechanical properties of the advanced high strength steel dual phase 590 (DP590) sheets have been investigated. It were found that fine martensitic structure was formed in the weld zone of the sample welded by single-pulse mode, while the microstructure in the heat-affected zone consists of a very fine martensitic microstructure and rough ferrite. However, using secondary pulse mode has led to the formation of tempered Martensite in the weld zone. The maximum load and the energy absorption to failure in the samples employing the secondary pulse cycle were higher, as compared to the sample employing the single pulse mode. Based on the fractography results, using the secondary pulse mode could significantly change the mode of failure upon shear tension testing. Therefore, the obtained results are some evidence that shows the use of secondary pulse mode can improve the microstructural feature and mechanical properties of the DP590 advanced high strength steel welds.

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