Effect of Microstructure Characteristics of Compacted Graphite Cast Irons of RuT300 and RuT450 on Low-cycle Fatigue Properties and Damage Mechanisms

doi:10.11901/1005.3093.2024.334

Chinese Journal of Materials Research

2025, Vol. 39

Issue (6): 443-454 DOI: 10.11901/1005.3093.2024.334

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Effect of Microstructure Characteristics of Compacted Graphite Cast Irons of RuT300 and RuT450 on Low-cycle Fatigue Properties and Damage Mechanisms

JIANG Ailong¹^,³, TAN Bingzhi²^,⁴, PANG Jianchao²(

), SHI Feng⁴, ZHANG Yunji¹^,³, ZOU Chenglu², LI Shouxin², WU Qihua¹^,³, LI Xiaowu⁴, ZHANG Zhefeng²

^1.State Key Laboratory of Engine and Powertrain System, Weifang 261061, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Weichai Power Co., Ltd., Weifang 261061, China
^4.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

JIANG Ailong, TAN Bingzhi, PANG Jianchao, SHI Feng, ZHANG Yunji, ZOU Chenglu, LI Shouxin, WU Qihua, LI Xiaowu, ZHANG Zhefeng. Effect of Microstructure Characteristics of Compacted Graphite Cast Irons of RuT300 and RuT450 on Low-cycle Fatigue Properties and Damage Mechanisms. Chinese Journal of Materials Research, 2025, 39(6): 443-454.

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Abstract

The microstructure, tensile properties, low-cycle fatigue properties and corresponding damage mechanisms of typical compacted graphite cast irons RuT300 and RuT450 for engine cylinder head and block were studied at room temperature. The differences in properties and damage mechanisms between the two materials were systematically compared. The results show that the tensile strength and low-cycle fatigue life of RuT450 are higher than those of RuT300, but the difference of low-cycle fatigue life is small, which is mainly due to the difference in pearlite and ferrite content. The high content of lamellar pearlite in RuT450 leads to more serious tension-compression cyclic stress asymmetry. Fatigue cracks preferentially propagate between clusters composed of graphite and ferrite, and the increase of pearlite content has a certain effect on improving the tensile strength and low cycle fatigue life of compacted graphite cast irons. The Basquin & Coffin-Manson model can effectively predict the low-cycle fatigue life of compacted graphite cast irons.

Key words: metallic materials compacted graphite cast iron microstructure tensile property low cycle fatigue damage mechanism

Received: 15 August 2024

ZTFLH:

TG142.1

Fund: Science Fund of State Key Laboratory of Engine and Powertrain System(skler202101);National Natural Science Foundation of China(52130002);National Natural Science Foundation of China(52321001)

Corresponding Authors: PANG Jianchao, Tel: (024)83978779, E-mail: jcpang@imr.ac.cn

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	Articles by authors
	JIANG Ailong
	TAN Bingzhi
	PANG Jianchao
	SHI Feng
	ZHANG Yunji
	ZOU Chenglu
	LI Shouxin
	WU Qihua
	LI Xiaowu
	ZHANG Zhefeng

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.334 OR https://www.cjmr.org/EN/Y2025/V39/I6/443

Table 1 Chemical compositions of RuT300 and RuT450 (mass fraction，%)

Fig.1 Dimension of specimens (a) tensile, (b) low cycle fatigue

Fig.2 Microstructures of RuT300 (a) and RuT450 (b)

Table 2 Tensile properties of the RuT300 and RuT450

Fig.3 Engineering stress-strain curves of RuT300 and RuT450

Table 3 Fatigue lives in LCF tests of the RuT450 and RuT300

Fig.4 The Δε/2-N_f relationship of the RuT300 and RuT450 (a) test lives, (b) average lives

Fig.5 Tensile fractographies of a RuT300 specimen^[25]: (a) fracture morphology in macroscope; (b) ferrite; (c) pearlite; (d) defect

Fig.6 Tensile fractographies of a RuT450 specimen: (a) macroscopic morphology; (b) cleavage and cracks around spherical graphite; (c) large cleavage planes and cracks around worm-like graphite; (d) small cleavage planes and cracks around clusters of worm-like graphite

Fig.7 Cyclic stress response curves of the RuT300 (a) and RuT450 (b)

Fig.8 Hysteresis loops of RuT300 (a) and RuT450 (b) in different cycles

Fig.9 Half life hysteresis loops of RuT450 (a) and RuT300 (b) under different strain amplitudes

Fig.10 Fatigue fracture morphologies of the RuT300 (ε_t = 0.3%, N_f = 569 cycles) (a) macroscopic morphology; (b~d) microscopic morphology at positions b, c and d

Fig.11 Fatigue fracture morphologies of the RuT450 (ε_t = 0.2%, N_f = 3382 cycles) (a) macroscopic morphology; (b-d) microscopic morphology at positions b, c and d

Fig.12 Longitudinal section of fatigue fracture for RuT300 (ε_t = 0.15%, N_f = 10000) (a) the macroscopic fracture profile induced by the main crack; (b) and (c) are the microstructures and cracks at b, c marked in Fig.12a, respectively

Fig.13 Longitudinal section of fatigue fracture for RuT450 (ε_t = 0.25%, N_f = 2682) (a) the macroscopic fracture profile induced by the main crack; (b), (c) and (d) are the microstructures and secondary cracks at b, c and d marked in Fig.13a, respectively

Fig.14 Fatigue fracture mode of RuT300 (a) and RuT450 (b)

Fig.15 Results fitted with Basquin & Coffin-Manson relationship for LCF lives of two kinds of compacted graphite cast irons

Fig.16 Results of low cycle fatigue life prediction (a) RuT300, (b) RuT450

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