Notch Tensile Properties Prediction of Low-alloy Steel Processed by Different Tempering Temperatures

doi:10.11901/1005.3093.2023.205

Chinese Journal of Materials Research

2024, Vol. 38

Issue (3): 197-207 DOI: 10.11901/1005.3093.2023.205

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Notch Tensile Properties Prediction of Low-alloy Steel Processed by Different Tempering Temperatures

QI Kaili¹^,³, HU Dejiang², GAO Chong³, LIU Feng¹^,⁴, PANG Jianchao³(

), SHAO Chenwei³, YANG Mengqi², LI Shouxin³, ZHANG Zhefeng³

^1.School of Mechanical Engineering, Liaoning Petrochemical University, Fushun 113001, China
^2.Maintenance and Test Branch, China Southern Power Grid Power Generation Co., Ltd., Guangzhou 511400, China
^3.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^4.Ji Hua Laboratory, Foshan 528200, China

Cite this article:

QI Kaili, HU Dejiang, GAO Chong, LIU Feng, PANG Jianchao, SHAO Chenwei, YANG Mengqi, LI Shouxin, ZHANG Zhefeng. Notch Tensile Properties Prediction of Low-alloy Steel Processed by Different Tempering Temperatures. Chinese Journal of Materials Research, 2024, 38(3): 197-207.

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Abstract

The microstructure and notch tensile fracture morphologies at different stress concentration factors of the low alloy steel 35CrMo for the head cover bolts of the pump turbine of a storage power station were investigated by electron backscatter diffraction microscopy and scanning electron microscopy. The effects of tempering temperature on the relationship between tensile properties, damage mechanism and mechanical properties of 35CrMo steel were studied. The results show that the microstructures of tempered state at 150~200^oC and quenched state are composed of lath martensite. After tempering at 400^oC, the microstructure of tempered troostite is more uniform. The final fracture of the notched specimens is a mixture of ductile and brittle fracture. At the two stress concentration factors (K_t = 3, 5), the notch tensile strength has the same changing trend with the tempering temperature. With the tempering temperature increasing, the notch tensile strength first increases and then decreases. For K_t = 3, the highest tensile strength is 2626 MPa at tempering temperature of 150^oC; when K_t = 5, the highest tensile strength is 2450 MPa at tempering temperature of 200^oC. Notch sensitivity ratio (NSR) is greater than 1, that is, notch strengthening effect occurs after different tempering temperatures, and notch sensitivity tends to decrease with the increase of tempering temperature. With the increase of stress concentration factor, the notch strengthening effect of specimens treated at different tempering temperatures shows an increasing trend first and then a decreasing trend, and the notch strengthening efficiency was the most obvious when tempering at 400^oC. Finally, based on the relationship between hardness and notch tensile strength, a fast prediction method of notch tensile strength was proposed, and the prediction error was less than 8%.

Key words: metallic materials low-alloy steel tempering temperature microstructure notch tensile prediction

Received: 30 March 2023

ZTFLH:

TG142.1

Fund: National Key Research and Development Program of China(2022YFB3708200);Science and Technology Project of Maintenance and Testing Branch, China Southern Power Grid Power Generation Co. Ltd(022200KK52180006)

Corresponding Authors: PANG Jianchao, Tel:(024)83978879, E-mail: jcpang@imr.ac.cn

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	Articles by authors
	QI Kaili
	HU Dejiang
	GAO Chong
	LIU Feng
	PANG Jianchao
	SHAO Chenwei
	YANG Mengqi
	LI Shouxin
	ZHANG Zhefeng

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2023.205 OR https://www.cjmr.org/EN/Y2024/V38/I3/197

Table 1 Chemical composition of 35CrMo steel (mass fraction, %)

Fig.1 Schematic diagram of heat treatment process for the head cover bolt of 35CrMo steel

Fig.2 Dimension of notched tensile specimen (a) K_t = 3; (b) K_t = 5 (unit: mm)

Fig.3 EBSD microstructures of 35CrMo steel processed at different tempered temperatures (a) Q; (b) QT150; (c) QT200; (d) QT400

Table 2 Notch tensile strength of 35CrMo steel processed by different tempering temperatures (MPa)

Fig.4 Tensile stress-displacement curves for notched specimens of 35CrMo steel under different tempering temperatures (a) K_t = 3; (b) K_t = 5

Fig.5 Effect of tempering temperature on notch tensile strength of 35CrMo steel

Table 3 Percentage reduction of area of 35CrMo steel processed by different tempering temperatures (%)

Fig.6 Relationship between notch tensile strength and contraction percentage

Table 4 Tensile properties for 35CrMo steel after tempering at different temperature^[28]

Fig.7 Comparisons between notch and smooth tensile properties of 35CrMo steel after tempering at different temperature treatments (a) relationship between notch tensile strength and tensile strength of smooth specimens; (b) relationship between tensile notch sensitivity ratio and tensile strength of smooth specimens

Table 5 Notch sensitivity ratio of 35CrMo steel after tempering at different temperature

Table 6 Percentage of notch tensile strength enhancement of 35CrMo steel processed by different tempering temperatures (%)

Fig.8 Effect of stress concentration factor on tensile properties of 35CrMo Steels under different tempering temperatures treatments (a) relationship between K_t and tensile strength; (b) relationship between K_t and NSR

Fig.9 Notch tensile fracture morphology of 35CrMo Steel after tempering at different temperature at K_t = 3 (a~c) Q; (d~f) QT150; (g~i) QT200; (j~l) QT400

Fig.10 Notch tensile fracture morphology of 35CrMo Steel after tempering at different temperature at K_t = 5 (a~c) Q; (d~f) QT150; (g~i) QT200; (j~l) QT400

Fig.11 Relationship between notch tensile strength and hardness of 35CrMo steel (a) σ_bN/H_V vs. H_V (K_t = 3); (b) σ_bN/H_V vs. H_V (K_t = 5); (c) σ_bN vs. H_V (K_t = 3); (d) σ_bN vs. H_V (K_t = 5)

Fig.12 Relationship between notch tensile strength and hardness of martensitic steel (a) σ_bN/H_B vs. H_B; (b) σ_bN vs. H_B

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