<strong>1100 MPa</strong>级高强钢的低周疲劳行为

doi:10.11900/0412.1961.2019.00291

金属学报

2020, Vol. 56

Issue (7): 937-948 DOI: 10.11900/0412.1961.2019.00291

本期目录 | 过刊浏览

1100 MPa级高强钢的低周疲劳行为

周红伟¹^,², 白凤梅³^,⁴(

), 杨磊¹^,², 陈艳¹^,², 方俊飞¹^,², 张立强³, 衣海龙⁴, 何宜柱¹^,²

1.安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室马鞍山 243032
2.安徽工业大学材料科学与工程学院马鞍山 243032
3.安徽工业大学冶金工程学院马鞍山 243032
4.东北大学轧制技术及连轧自动化国家重点实验室沈阳 110819

Low-Cycle Fatigue Behavior of 1100 MPa Grade High-Strength Steel

ZHOU Hongwei¹^,², BAI Fengmei³^,⁴(

), YANG Lei¹^,², CHEN Yan¹^,², FANG Junfei¹^,², ZHANG Liqiang³, YI Hailong⁴, HE Yizhu¹^,²

1. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243032, China
2. School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, China
3. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, China
4. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

引用本文:

周红伟, 白凤梅, 杨磊, 陈艳, 方俊飞, 张立强, 衣海龙, 何宜柱. 1100 MPa级高强钢的低周疲劳行为[J]. 金属学报, 2020, 56(7): 937-948.
Hongwei ZHOU, Fengmei BAI, Lei YANG, Yan CHEN, Junfei FANG, Liqiang ZHANG, Hailong YI, Yizhu HE. Low-Cycle Fatigue Behavior of 1100 MPa Grade High-Strength Steel[J]. Acta Metall Sin, 2020, 56(7): 937-948.

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摘要:

研究了在对称应变控制条件下1100 MPa级调质态高强钢的低周疲劳性能，借助OM、SEM、TEM等手段对高强钢在低周疲劳载荷下的微观组织、断口形貌、裂纹扩展特性、夹杂物形态等进行了研究。结果表明，调质态1100 MPa高强钢具有优异的低周疲劳性能，主要有2个原因：一是由于夹杂物形态为近圆形，直径为2~5 μm，低于夹杂物引起疲劳裂纹萌生的临界尺寸，裂纹萌生于试样表面，提高了疲劳裂纹萌生寿命；二是原奥氏体晶界、马氏体板条包/束界、夹杂物/孔洞都会诱导裂纹偏转，使裂纹走向曲折，降低了裂纹扩展速率，提高了疲劳裂纹扩展寿命。

关键词 ：高强钢, 低周疲劳, 夹杂物, 疲劳断裂, 疲劳裂纹扩展

Abstract：

The low-cycle fatigue (LCF) behavior of 1100 MPa grade tempered high strength steel under symmetrical strain control conditions was studied at the strain amplitude ranges of 0.4%~1.2% in this work. The LCF properties of quenching and tempering high strength steel were examined by means of OM, SEM and TEM. The microstructure changes, fracture morphology, crack propagation characteristics and inclusion morphology were studied in detail. The results show that the cyclic hardening and cyclic softening depend on strain amplitude. At the low strain amplitude of 0.4%, rapid cyclic hardening occurs in initial 10 cyc, and then the stress remains almost unchanged until the sample breaks. While at the strain amplitude ranges of 0.5%~1.2%, the cyclic hardening reaches a peak at the first few cycles, followed by the remarkable cyclic softening until the sample fails. The cyclic softening is mainly due to the recovery of some martensite lath under low-cycle fatigue loading and the decrease of dislocation density in the laths. 1100 MPa grade high-strength steel is found to obey LCF Manson-Coffin relationship. The high-strength steel has excellent LCF performance for two main reasons, which is related with the shape and size of inclusions. One is that the shape of the inclusion is nearly circular, and the diameter is 2~5 μm, which is lower than the critical dimension of the inclusions causing fatigue crack initiation. The crack is initiated on the surface of the sample. This increases fatigue crack initiation life. The other one is that the original austenite grain boundary, the martensite packet/block boundary and the inclusions or cavities can induce the crack deflection, reducing the crack propagation rate and increasing fatigue crack propagation life.

Key words： high-strength steel low-cycle fatigue inclusion fatigue fracture crack propagation

收稿日期: 2019-09-04

ZTFLH:

TG142.1，TG111.8

基金资助:国家自然科学基金钢铁联合基金培育项目(U1760108);国家自然科学基金项目(51674079);国家自然科学基金项目(51874001);安徽省高等学校自然科学研究重点项目(KJ2018A0062);安徽省高等学校自然科学研究重点项目(KJ2019A0059)

作者简介: 周红伟，男，1978年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00291 或 https://www.ams.org.cn/CN/Y2020/V56/I7/937

图1 低周疲劳试样示意图

图2 不同应变幅下高强钢循环应力响应曲线

图3 1100 MPa级高强钢的低周疲劳寿命曲线及与其它级别钢的低周疲劳寿命比较

表1 不同种类高强钢的力学性能

图4 高强钢调质态组织的TEM像

图5 高强钢中碳化物强化相形貌、SAED花样及EDS分析

图6 高强钢在应变幅为0.4%和1.0%下疲劳断裂试样的TEM像

图7 不同应变幅下高强钢疲劳裂纹于试样表面萌生

图8 高强钢在1.0%应变下的主裂纹疲劳断口和二次裂纹

图9 疲劳断口上的夹杂物

图10 高强钢在1.0%应变幅下的裂纹扩展形貌

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