Effect of hardening holding time and tempering duration on the microstructure and hardness of CHQ 10B21 wire

Melya D. Sebayang; Kimar Turnip

doi:10.30811/jpl.v24i3.8473

Effect of hardening holding time and tempering duration on the microstructure and hardness of CHQ 10B21 wire

Melya D. Sebayang, Kimar Turnip

Abstract

Heat treatment parameters play an important role in controlling the mechanical properties and microstructure of bolt materials. The research was conducted on the production of bolts produced from raw material wire CHQ 10B21. This study aims to evaluate the effect of hardening holding time and tempering duration on the hardness, tensile strength, and microstructure of CHQ 10B21 wire used for bolt production. The material was heated at 870°C with varying holding times, followed by oil quenching and tempering at 480°C with different tempering durations. Hardness testing was evaluated based on the HES D3211-99A standard with a target range of 22–32 HRC, while metallographic observations were conducted using sequential grinding and polishing. The results showed a direct relationship between holding time, tempering duration, and material properties. Longer hardening holding time increased hardness, with the highest value of 29 HRC obtained at 60 minutes, compared with 14 HRC in the raw material. Increasing tempering time improved tensile strength, reaching 891.91 N/mm² at 75 minutes after 60 minutes of hardening. Microstructural analysis showed the formation of tempered martensite and tempered bainite, with more homogeneous phase distribution at longer heat-treatment durations. These findings indicate that the optimal heat treatment condition for CHQ 10B21 bolt production is 60 minutes hardening followed by 75 minutes tempering.

Keywords

CHQ 10B21; tempering; martensite; hardening; bolting.

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References

H.-M. Chang, Technical Progress of Cold-Forged Steel Wire Rod for Automotive Fasteners, China Fasteners World no. 66, 2022.

V. Madhuri, R. Gobinath, and G. Balachandran, “Effect of Carbon on the Microstructure and Mechanical Properties in Wire Rods Used for the Manufacture of Cold Heading Quality Steels”, Transactions of the Indian Institute of Metals, vol. 72, no. 1, pp. 155–166, Jan. doi: 10.1007/s12666-018-1470-1, 2019.

Handbook of Metal Forming, vol. 4, no. 2, doi: 10.1007/BF02834383, 1986.

Budiarto and K. Turnip, “Analisis Pengaruh Holding Time Terhadap Sifat Mekanis Dan Struktur Mikro Pada Proses Induction Tempering Batang Piston Baja SCM 420 H”, Jurnal Rekayasa Mesin, vol. 9, no. 3, pp. 235–239, 2018.

M. D. Sebayang, S. Max Yudo, and C. Silitonga, “Effect of heat treatment on Microstructure of steel AISI 01 Tools”, in IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing, Apr. doi: 10.1088/1757-899X/343/1/012005, 2018.

Medicon Engineering Themes, “Comparative Analysis of AISI 10B21 app Licable for Fasteners”, doi: 10.55162/mcet.03.095, Nov 2022.

C. C. Yang and S. T. Wang, “Improvement of mechanical properties of spheroidized 10B21 steel coil using Taguchi method of robust design”, Sensors and Materials, vol. 30, no. 3, pp. 503–514, doi: 10.18494/SAM.2018.1755, 2018.

K. J. Chen, F. Y. Hung, T. S. Lui, and C. H. Tseng, “Effects of tempered microstructure and hydrogen concentration on hydrogen-induced embrittlement susceptibility of 10B21 screws at low temperature”, Mater Trans, vol. 59, no. 7, pp. 1124–1129, doi: 10.2320/matertrans.M2017342, 2018.

X. Chen and Y. Hou, “Effect of heat treatment on microstructure and properties of 10B21 cold-heading steel for fasteners”, in Vibroengineering Procedia, Extrica, pp. 213–217. doi: 10.21595/vp.2023.23479, Sep. 2023.

Q. Dong, H. Lu, Y. Wang, X. Yang, L. Zhang, and H. Dong, “The Influence of Strain Aging at Different Temperatures on the Mechanical Properties of Cold-Drawn 10B21 Steel Combined with an Electron Microscope Study of the Structures”, Materials, vol. 17, no. 4, doi: 10.3390/ma17040826, Feb. 2024.

B. E. S. Davenport, E. C. Bain, and N. J. Kearny, “Transformation of Austenite at Constant Subcritical Temperatures”,1930.

C. R. Simcoe, A. R. Elseo, and G. K. Manning, “Study of the Effect of Boron on The Decomposition of Austenite”, Journal Of Metals Transaction AIME, pp. 193–199, 1955.

E. Frydman, S. Eng, and B. Letkowska, “Properties Of Boron Steel After Different Heat Treatments”, in Scientific Proceedings IX International Congress Machines Technologies Materials, pp. 72–74, 2012.

A. F. Turner, C. S. Betteridge, and J. Avery, “Development of Steels for the Fasteners and Cold Forging Markets by Testing Under Fastener Production Conditions”, Luxembourg, 1984.

Z. Song et al., “Optimizing slag content to control Ds-type inclusions in 10B21 cold heading steel”, Minerals, vol. 11, no. 9, doi: 10.3390/min11091016, Sep. 2021.

X. K. Yang, D. Xu, B. Zheng, and X. Yin, “Effect Of Process Factors On Solidification Process Of 10B21 Steel Bloom” , 2022.

M. Yahyai et al., “Post-Fire Mechanical Properties of High Strength Grade 8.8 Steel Bolts”, https://www.researchgate.net/publication/310325398, 2016.

H. Zheng, K. M. Wu, O. Isayev, O. Hress, S. Yershov, and V. Tsepelev, “Effect of heat treatment parameters on the microstructure of quenching–partitioning–tempering steel,” Heat Treatment and Surface Engineering, vol. 1, no. 1–2, pp. 83–86, doi: 10.1080/25787616.2018.1560168, (2019).

Z. li Liu, X. Chen, Y. xiang LI, and K. hua HU, “High Boron Iron-Based Alloy and Its Modification”, Journal of Iron and Steel Research International, vol. 16, no. 3, doi: 10.1016/S1006-706X(09)60041-8, 2009.

H. guang Fu, X. ni Liu, Y. wei Yang, X. le Cheng, and Y. hu Qu, “Effect of Heat Treatment on Microstructure and Properties of High Boron-High Speed Steel”, Transactions of the Indian Institute of Metals, vol. 71, no. 10, pp. 2423–2432, doi: 10.1007/s12666-018-1373-1, Oct. 2018.

K. J. Chen, F. Y. Hung, T. S. Lui, and C. H. Tseng, “Decrease in hydrogen embrittlement susceptibility of 10B21 screws by bake aging”, Metals (Basel), vol. 6, no. 9, doi: 10.3390/met6090211, Sep. 2016.

J. E. Gould, M. Harris, D. Sakkinen, and W. Peterson, “Application of Direct Resistance Treatment to Localized Areas on Advanced High Strength Steel Sheet.” , (2022).

J. Hardell, S. Hernandez, S. Mozgovoy, L. Pelcastre, C. Courbon, and B. Prakash “Effect of oxide layers and near surface transformations on friction and wear during tool steel and boron steel interaction at high temperatures”, Wear, vol. 330–331, pp. 223–229, doi: 10.1016/j.wear.2015.02.040, May 2015,

B. B. He, W. Xu, and M. X. Huang, “Effect of ausforming temperature and strain on the bainitic transformation kinetics of a low carbon boron steel”, Philosophical Magazine, vol. 95, no. 11, pp. 1150–1163, doi: 10.1080/14786435.2015.1025886, Apr. 2015.

A. Bardelcik, M. J. Worswick, and M. A. Wells, “The influence of martensite, bainite and ferrite on the as-quenched constitutive response of simultaneously quenched and deformed boron steel - Experiments and model”, Mater Des, vol. 55, pp. 509–525, doi: 10.1016/j.matdes.2013.10.014, 2014.

J. Y. Choi, J. H. Kim, D. H. Ko, P. K. Seo, D. C. Ko, and B. M. Kim, “Prediction of Hardness for Partially Quenched Boron Steel Using Quench Factor Analysis”, Manufacturing Science and Technology, vol. 3, no. 5, pp. 259–265, doi: 10.13189/mst.2015.030511, Dec. 2015.

DOI: http://dx.doi.org/10.30811/jpl.v24i3.8473