蠕墨铸铁<strong>RuT300</strong>和<strong>RuT450</strong>的低周疲劳性能和损伤机制

doi:10.11901/1005.3093.2024.334

材料研究学报

2025, Vol. 39

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

研究论文

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蠕墨铸铁RuT300和RuT450的低周疲劳性能和损伤机制

姜爱龙¹^,³, 谭炳治²^,⁴, 庞建超²(

), 石锋⁴, 张允继¹^,³, 邹成路², 李守新², 伍启华¹^,³, 李小武⁴, 张哲峰²

^1.内燃机与动力系统全国重点实验室潍坊 261061
^2.中国科学院金属研究所沈阳 110016
^3.潍柴动力股份有限公司潍坊 261061
^4.东北大学材料科学与工程学院沈阳 110819

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

引用本文:

姜爱龙, 谭炳治, 庞建超, 石锋, 张允继, 邹成路, 李守新, 伍启华, 李小武, 张哲峰. 蠕墨铸铁RuT300和RuT450的低周疲劳性能和损伤机制[J]. 材料研究学报, 2025, 39(6): 443-454.
Ailong JIANG, Bingzhi TAN, Jianchao PANG, Feng SHI, Yunji ZHANG, Chenglu ZOU, Shouxin LI, Qihua WU, Xiaowu LI, Zhefeng ZHANG. Effect of Microstructure Characteristics of Compacted Graphite Cast Irons of RuT300 and RuT450 on Low-cycle Fatigue Properties and Damage Mechanisms[J]. Chinese Journal of Materials Research, 2025, 39(6): 443-454.

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摘要:

研究了蠕墨铸铁RuT300和RuT450的室温显微组织、拉伸性能、低周疲劳性能和损伤机制，并进行了比较。结果表明：RuT450的抗拉强度和低周疲劳寿命均高于RuT300，可归因于珠光体与铁素体含量的不同。RuT450中含量较高的片层珠光体产生严重的拉压循环应力不对称。其结果是，疲劳裂纹优先在石墨与铁素体构成的团簇间扩展，而珠光体含量的提高影响蠕墨铸铁材料的抗拉强度和低周疲劳寿命的提高。使用Basquin&Coffin-Manson模型可较为准确地预测蠕墨铸铁低周疲劳的寿命。

关键词 ：金属材料, 蠕墨铸铁, 微观组织, 拉伸性能, 低周疲劳, 损伤机制

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

收稿日期: 2024-08-15

ZTFLH:

TG142.1

基金资助:内燃机与动力系统全国重点实验室开放课题(skler202101);国家自然科学基金(52130002);国家自然科学基金(52321001)

通讯作者: 庞建超，副研究员，jcpang@imr.ac.cn，研究方向为材料疲劳与断裂

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

作者简介: 姜爱龙，男，1982年生，正高级工程师

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表1 RuT300和RuT450的化学成分

图1 拉伸和低周疲劳试样的尺寸

图2 RuT300和RuT450的显微组织

表2 RuT300和RuT450的拉伸性能

图3 RuT300和RuT450的工程应力-应变曲线

表3 RuT300和RuT450的低周疲劳寿命

图4 RuT300和RuT450的总应变-疲劳寿命关系

图5 RuT300样品的拉伸断口[25]

图6 RuT450样品的拉伸断口

图7 RuT300和RuT450的循环应力响应曲线

图8 RuT300和RuT450不同周次的滞回环

图9 RuT450和RuT300不同应变幅的半寿命滞回环

图10 RuT300的疲劳断口(εt = 0.3%, Nf = 569周次)

图11 RuT450的疲劳断口(εt = 0.2%, Nf = 3382周次)

图12 RuT300的典型疲劳断口纵剖面

图13 RuT450的典型疲劳断口纵剖面

图14 RuT300和RuT450的疲劳断裂方式

图15 蠕墨铸铁RuT300和RuT450疲劳寿命的Basquin & Coffin-Manson 拟合曲线(a) RuT300 (b) RuT450

图16 RuT300和RuT450的低周疲劳寿命预测结果

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