Effect of heat treatment on precipitate and mechanical properties of 45CrNiMoV steel

Sheng Xu, Ya Zheng Liu, Le Yu Zhou, Yong Ming Yan

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1 Citation (Scopus)


Effects of tempering temperatures on 45CrNiMoV high-strength steel precipitates and its property were investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), orthogonal experiments, hardness and tensile tests. The results show that the relatively significant effect of tempering temperatures on strength and impact energy is observed. Strength and hardness of the steel get to the peak value when tempered at 550°C. When the temperature is above 600°C, the strength of the steel sharply decreases. As tempering temperature increasing from 570°C to 640°C, the shape of the precipitates evolve from rod to sphere gradually. Fine carbides precipitates help to stabilize the remaining lath boundaries when tempered at 570°C. The coarsening of the carbide particles are ineffective pinning of the lath boundary when tempered at 640°C. The optimum heat treatment process of the steel is quenching at 880°C for 45 min in oil and tempering at 590°C for 4 h.

Original languageEnglish
Pages (from-to)127-132
Number of pages6
JournalCailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
Issue number3
Publication statusPublished - 2014
Externally publishedYes


  • 45CrNiMoV steel
  • Mechanical property
  • Precipitation
  • Tempering temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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