Fatigue strength and crack initiation mechanism of very-high-cycle fatigue for low alloy steels
文献类型：会议论文
| 作者 | Zhao AG(赵爱国) ; Qian GA(钱桂安); Hong YS(洪友士)
|
| 出版日期 | 2012-08 |
| 会议名称 | 8th Symposium on Bulk Metallic Glasses (BMGs)/TMC Annual Meeting and Exhibition |
| 会议日期 | FEB 27-MAR 03, 2011 |
| 会议地点 | San Diego, CA |
| 通讯作者邮箱 | hongys@imech.ac.cn |
| 关键词 | CHROMIUM-BEARING STEEL LONG-LIFE FATIGUE S-N CURVE METALLIC MATERIALS BEHAVIOR FAILURE REGIME STRESS |
| 卷号 | 43A |
| 期号 | 8 |
| 页码 | 2753-2762 |
| 通讯作者 | Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| 中文摘要 | The fatigue strength and crack initiation mechanisms of very-high-cycle fatigue (VHCF) for two low alloy steels were investigated. Rotary bending tests at 52.5 Hz with hour-glass type specimens were carried out to obtain the fatigue propensity of the test steels, for which the failure occurred up to the VHCF regime of 10(8) cycles with the S-N curves of stepwise tendency. Fractography observations show that the crack initiation of VHCF is at subsurface inclusion with "fish-eye" pattern. The fish-eye is of equiaxed shape and tends to tangent the specimen surface. The size of the fish-eye becomes large with the increasing depth of related inclusion from the surface. The fish-eye crack grows faster outward to the specimen surface than inward. The values of the stress intensity factor (K (I) ) at different regions of fracture surface were calculated, indicating that the K (I) value of fish-eye crack is close to the value of relevant fatigue threshold (Delta K (th) ). A new parameter was proposed to interpret the competition mechanism of fatigue crack initiation at the specimen surface or at the subsurface. The simulation results indicate that large inclusion size, small grain size, and high strength of material will promote fatigue crack initiation at the specimen subsurface, which are in agreement with experimental observations. |
| 收录类别 | CPCI-S ; EI |
| 合作状况 | 国际 |
| 产权排序 | [Hong, Youshi; Zhao, Aiguo; Qian, Guian; Zhou, Chengen] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Qian, Guian] PSI Paul Scherrer Inst, Lab Nucl Mat, CH-5232 Villigen, Switzerland; [Zhou, Chengen] Inner Mongolia Univ Technol, Coll Sci, Hohhot 010051, Peoples R China |
| 会议网址 | http://dx.doi.org/10.1007/s11661-011-0816-7 |
| 会议录 | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
 |
| 会议录出版者 | SPRINGER |
| 学科主题 | Materials Science ; Multidisciplinary; Metallurgy & Metallurgical Engineering |
| 会议录出版地 | 233 SPRING ST, NEW YORK, NY 10013 USA |
| 语种 | 英语 |
| ISSN号 | 1073-5623 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/46827]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhao AG,Qian GA,Hong YS. Fatigue strength and crack initiation mechanism of very-high-cycle fatigue for low alloy steels[C]. 见:8th Symposium on Bulk Metallic Glasses (BMGs)/TMC Annual Meeting and Exhibition. San Diego, CA. FEB 27-MAR 03, 2011.http://dx.doi.org/10.1007/s11661-011-0816-7. |
入库方式： OAI收割
来源：力学研究所
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