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Microstructural evolution and mechanical properties of 55NiCrMoV7 hot-work die steel during quenching and tempering treatments

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Abstract

55NiCrMoV7 hot-work die steel is mainly used to manufacture heavy forgings in the fields of aerospace and automobile. This study aims to clarify the effects of heat treatment on the microstructural evolution and mechanical properties of the steel, in order to find out an optimal heat treatment scheme to obtain an excellent balance of strength, ductility and toughness. The steel was quenched at temperature from 790 °C to 910 °C followed by tempering treatments of 100–650 °C for 5 h. The mechanical property tests were carried out by tensile, impact toughness and hardness. Optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to observe the austenite grains, lath martensite, carbides and fracture morphology. The results show that the quenching temperature mainly influences the austenite grain size and the volume fraction of undissolved carbides (UCs), while the tempering temperature mainly influences the size and morphology of the martensite with a body centered cubic (BCC) and the carbides with a face centered cubic (FCC). The mechanical properties of the steel, including yield and tensile strength, ductility, impact toughness and hardness, get an excellent balance at a quenching range of 850–870 °C. As the tempering temperature increases, the yield and tensile strength and hardness decrease, while the ductility and impact toughness increase. These variation trends can be further verified by fracture SEM observation and analysis. Combined with a macro-micro coupled finite element (MMFE) modeling technique, the cooling rate, microstructural evolution and yield strength of the steel were predicted and compared with the tested data.

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References

  1. Velay V, Bernhart G, Penazzi L (2006) Cyclic behavior modeling of a tempered martensitic hot work tool steel. Int J Plasticity 22(3):459–496

    Article  Google Scholar 

  2. Zhang Z, Delagnes D, Bernhart G (2007) Ageing effect on cyclic plasticity of a tempered martensitic steel. Int J Fatigue 29(2):336–346

    Article  Google Scholar 

  3. Zhu J, Zhang ZH, Xie JX (2019) Improving strength and ductility of H13 die steel by pre-tempering treatment and its mechanism. Mater Sci Eng A 752(3):101–114

    Article  Google Scholar 

  4. Li JY, Chen YL, Huo JH (2015) Mechanism of improvement on strength and toughness of H13 die steel by nitrogen. Mater Sci Eng A 640:16–23

    Article  Google Scholar 

  5. Li JY, Zhao P, Yanagimoto J et al (2012) Effects of heat treatment on the microstructures and mechanical properties of a new type of nitrogen-containing die steel. Int J Miner Metall Mater 19(6):511–517

    Article  Google Scholar 

  6. Pérez M, Rodríguez C, Belzunce FJ (2014) The use of cryogenic thermal treatments to increase the fracture toughness of a hot work tool steel used to make forging dies. Proc Mater Sci 3:604–609

    Article  Google Scholar 

  7. Yan ZJ, Liu K, Eckert J (2020) Effect of tempering and deep cryogenic treatment on microstructure and mechanical properties of Cr-Mo-V-Ni steel. Mater Sci Eng A 787:139520. https://doi.org/10.1016/j.msea.2020.139520

    Article  Google Scholar 

  8. Weng ZJ, Gu KX, Wang KK et al (2020) The reinforcement role of deep cryogenic treatment on the strength and toughness of alloy structural steel. Mater Sci Eng A. 772: 138698. https://doi.org/10.1016/j.msea.2019.138698

    Article  Google Scholar 

  9. Peng F, Xu YB, Han DT et al (2019) In influence of pre-tempering treatment on microstructure and mechanical properties in quenching and partitioning steels with ferrite-martensite start structure. Mater Sci Eng A 756:248–257

    Article  Google Scholar 

  10. Luo H, Shi J, Wang C et al (2011) Experimental and numerical analysis on formation of stable austenite during the intercritical annealing of 5 Mn steel. Acta Mater 59(10):4002–4014

    Article  Google Scholar 

  11. Åsberg M, Fredriksson G, Hatami S et al (2019) In influence of post treatment on microstructure, porosity and mechanical properties of additive manufactured H13 tool steel. Mater Sci Eng A 742:584–589

    Article  Google Scholar 

  12. Ali M, Porter D, Kömi J et al (2019) The effect of double austenitization and quenching on the microstructure and mechanical properties of CrNiMoWMnV ultrahigh-strength steels after low-temperature tempering. Mater Sci Eng A 763:138169. https://doi.org/10.1016/j.msea.2019.138169

    Article  Google Scholar 

  13. Chen K, Jiang ZH, Liu FB et al (2020) Enhanced mechanical properties by retained austenite in medium-carbon Si-rich microalloyed steel treated by quenching-tempering, austempering and austempering-tempering processes. Mater Sci Eng A 790:139742. https://doi.org/10.1016/j.msea.2020.139742

    Article  Google Scholar 

  14. Zhou QC, Wu XC, Shi NN et al (2011) Microstructure evolution and kinetic analysis of DM hot-work die steels during tempering. Mater Sci Eng A 528(8):5696–5700

    Article  Google Scholar 

  15. Zhang YP, Zhan DP, Qi XW et al (2017) Microstructure and mechanical properties of Cr14 ultra-high-strength steel at different tempering temperatures around 773 K. Mater Sci Eng A 698:152–161

    Article  Google Scholar 

  16. Liu HH, Fu PX, Liu HW et al (2018) Microstructure evolution and mechanical properties in 718H pre-hardened mold steel during tempering. Mater Sci Eng A 709:181–192

    Article  Google Scholar 

  17. Saha DC, Biro E, Gerlich AP et al (2016) Effects of tempering mode on the structural changes of martensite. Mater Sci Eng A 673:467–475

    Article  Google Scholar 

  18. Jebaraj M, Kumar MP, Anburaj R (2020) Effect of LN2 and CO2 coolants in milling of 55NiCrMoV7 steel. J Manuf Process 53:318–327

    Article  Google Scholar 

  19. Zhang ZP, Qi YH, Delagnes D et al (2007) Microstructure variation and hardness diminution during low cycle fatigue of 55NiCrMoV7 steel. J Iron Steel Research Int 14:68–73

    Article  Google Scholar 

  20. Egner H, Egner W (2014) Modeling of a tempered martensitic hot work tool steel behavior in the presence of thermo-viscoelastic coupling. Int J Plast 57:77–91

    Article  Google Scholar 

  21. Sun C, Fu PX, Ma XP et al (2020) Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel. J Mater Res Technol 9(4):7701–7710

    Article  Google Scholar 

  22. Wu C, Meng QL (2019) Microstructural evolution of a steam-turbine rotor subjected to a water-quenching process: numerical simulation and experimental verification. Adv Manuf 7:84–104

    Article  Google Scholar 

  23. Morsdorf L, Tasan CC, Ponge D et al (2015) 3D structural and atomic-scale analysis of lath martensite: Effect of the transformation sequence. Acta Mater 95:366–377

    Article  Google Scholar 

  24. He BB, Huang MX (2015) Revealing the intrinsic nanohardness of lath martensite in low carbon steel. Metall Mater Trans A 46:688–694

    Article  Google Scholar 

  25. Maalekian M, Kozeschenik E, Chatterjee S et al (2007) Mechanical stabilisation of eutectoid steel. Mater Sci Technol 23:610–612

    Article  Google Scholar 

  26. Tao XG, Han LZ, Gu JF (2014) Effect of tempering on microstructure evolution and mechanical properties of X12CrMoWVNbN10-1-1 steel. Mater Sci Eng A 618:189–204

    Article  Google Scholar 

  27. Hoseiny H, Klement U, Sotskovszki P et al (2011) Comparison of the microstructures in continuous-cooled and quench-tempered pre-hardened mould steels. Mater Des 32:21–28

    Article  Google Scholar 

  28. Garrison WM, Wojcieszynski AL (2007) A discussion of the effect of inclusion volume fraction on the toughness of steel. Mater Sci Eng A 464:321–329

    Article  Google Scholar 

  29. Chen K, Jiang ZH, Liu FB et al (2019) Effect of quenching and tempering temperature on microstructure and tensile properties of micro-alloyed ultra-high strength suspension spring steel. Mater Sci Eng A 766:138272. https://doi.org/10.1016/j.msea.2019.138272

    Article  Google Scholar 

  30. Lütjering G, Williams JC (2007) Titanium, (2nd edn). Springer, Berlin

    Google Scholar 

  31. Kim B, Boucard E, Sourmail T et al (2014) The influence of silicon in tempered martensite: understanding the microstructure properties relationship in 0.5–0.6 wt.% C steels. Acta Mater 68:169–178

    Article  Google Scholar 

Download references

Acknowledgement

The authors acknowledge with gratitude funding received from the fellowship of China Postdoctoral Science Foundation (Grant No. 2020M672309).

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Authors and Affiliations

  1. Luoyang CITIC HIC Casting & Forging Co., Ltd, Luoyang, 471039, Henan, People’s Republic of China

    Xing-Sheng Yu, Chuan Wu, Ru-Xing Shi & Ya-Sha Yuan

  2. National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould, Tianjin University of Technology and Education, Tianjin, 300222, People’s Republic of China

    Xing-Sheng Yu, Chuan Wu, Ru-Xing Shi & Ya-Sha Yuan

  3. CITIC Heavy Industries Co., Ltd, Luoyang, 471039, Henan, People’s Republic of China

    Chuan Wu

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  1. Xing-Sheng Yu
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  2. Chuan Wu
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Correspondence to Chuan Wu.

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Yu, XS., Wu, C., Shi, RX. et al. Microstructural evolution and mechanical properties of 55NiCrMoV7 hot-work die steel during quenching and tempering treatments. Adv. Manuf. 9, 520–537 (2021). https://doi.org/10.1007/s40436-021-00352-3

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  • DOI: https://doi.org/10.1007/s40436-021-00352-3

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