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Behavior of Nb influence on structure and properties of 30Cr13 cast martensitic stainless steel

  • Yang-fan Jin
  • Tuo Zhang
  • Qi-yu Zang
  • Yi-tao YangEmail author
Original Paper
  • 27 Downloads

Abstract

The microstructure, mechanical properties and corrosion resistance of 30Cr13 martensitic stainless steel (MSS) with different Nb contents were investigated by using the optical microscope, scanning electron microscope, X-ray diffractometer, HRC hardness measurement apparatus and tensile testing machine. Nb was found to retard the formation of austenite and promote the precipitation of carbides by calculating. The results showed that the addition of 0.2 wt.% Nb elements could improve the strength and corrosion resistance of 30Cr13 martensitic stainless steels while the reduction in toughness was less because of the inhibited effect on Cr-rich carbides precipitation by Nb addition. Specially, M23C6-type carbides almost disappeared in 0.6Nb-MSS. Moreover, the main existent form of Nb element was NbC and the strong carbide-forming ability of Nb element increased the quantity of carbides with the morphology changing from spherical-type to chain-type. 0.2Nb-MSS shows excellent strength, adequate toughness and sufficient corrosion resistance for the application.

Keywords

Niobium addition Martensitic stainless steel Microstructure Mechanical property Corrosion resistance 

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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  • Yang-fan Jin
    • 1
  • Tuo Zhang
    • 1
  • Qi-yu Zang
    • 1
  • Yi-tao Yang
    • 1
    Email author
  1. 1.School of Materials Science and EngineeringShanghai UniversityShanghaiChina

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