Conventional Heat-Resistant Steels

  • Wei YanEmail author
  • Wei Wang
  • Yiyin Shan
  • Ke Yang
  • Wei Sha
Part of the Engineering Materials book series (ENG.MAT.)


A change of the slope at about 660 °C on the dilatometry curve of 9Cr martensitic heat-resistant steel during heating process is explained by the large amount of carbonitride precipitation in the steel. The normalising temperature has little effect on mechanical properties of 10Cr steel at room temperature, while the tempering temperature has a greater effect. The toughness increases with increasing tempering temperature. Laves phase is one of the most significant precipitates in ferritic/martensitic heat-resistant steels. Co in the steel could accelerate the growth of Laves phase. Coalescence of the large Laves phase precipitates would lead to the brittle intergranular fracture. The nitride-strengthened martensitic heat-resistant steel is precipitation strengthened only by nitrides. In the latter part of the chapter, the effect of nitride precipitation behaviour on the impact toughness is discussed. When the tempering temperature is increased, a large amount of nitrides form in the matrix. The impact energy is greatly increased. The ductile-brittle transition temperature also decreases when the tempering temperature is increased from 650 to 750 °C. The nitride precipitation while increasing tempering temperature is responsible for the improved impact toughness.


Impact Toughness Lave Phase Prior Austenite Maraging Steel 10Cr Steel 
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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Wei Yan
    • 1
    Email author
  • Wei Wang
    • 1
  • Yiyin Shan
    • 1
  • Ke Yang
    • 1
  • Wei Sha
    • 2
  1. 1.Institute of Metal Research, Chinese Academy of SciencesShenyangChina
  2. 2.Queen’s University BelfastBelfastUK

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