| 低碳马氏体型超高强度钢的组织结构和疲劳断裂行为 |
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| 引用本文： | 高惠临,谈育煦,王笑天.低碳马氏体型超高强度钢的组织结构和疲劳断裂行为[J].西安交通大学学报,1986(2). |
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| 作者姓名： | 高惠临 谈育煦 王笑天 |
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| 作者单位： | 西安交通大学材料科学与工程系
(高惠临，谈育煦)，西安交通大学材料科学与工程系(王笑天) |
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| 摘 要： | 本文在低碳马氏体型超高强度钢强韧性规律研究的基础上,系统地研究了疲劳断裂规律。试验结果表明,典型钢种25Si2Mn2CrNiMoV通过950℃加热油淬350℃回火,其疲劳强度(σ_(-1),σ_(-1N)等)和裂纹扩展抗力(dα/dN,ΔK_(th)等)可以实现最优化。通过对疲劳裂纹的原位透射电子显微分析,发现了疲劳裂纹尖端塑性区内板条马氏体晶体交界处的残余奥氏体薄膜发生应变诱发马氏体相变,观察到疲劳裂纹扩展过程中组织结构的变化情况,从而讨论了显微组织结构与疲劳断裂行为的对应关系。
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| 关 键 词： | 马氏体 显微组织(金相学)疲劳断裂 |
RELATIONSHIP BETWEEN MICROSTRUCTURES AND THE FATIGUE BEHAVIOR OF LOW-CARBON MARTENSITIC ULTRA-HIGH STRENGTH STEELS |
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| Gao Huilin,Tan Yuxi,Wang Xiaotian.RELATIONSHIP BETWEEN MICROSTRUCTURES AND THE FATIGUE BEHAVIOR OF LOW-CARBON MARTENSITIC ULTRA-HIGH STRENGTH STEELS[J].Journal of Xi'an Jiaotong University,1986(2). |
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| Authors: | Gao Huilin Tan Yuxi Wang Xiaotian |
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| Institution: | Gao Huilin;Tan Yuxi;Wang Xiaotian Department of Material Science and Engineering |
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| Abstract: | This paper deals with the recent work on the relationship between the micro-structure and the fatigue behavior of low-carbon mariensitic ultra-high strengthsteels (25Si2Mn2CrNiMoV). In order ic derive more detailed informations aboutthe relationship between microstructurgl features near a fatigue crack and thefatigue crack propagation behavior, a special TEM experiment on the fracturesurface was performed. It was found that within the plastic zone at the tip of acrack the austenite in the form of thin films could be transformed into martensiteunder high strain covditions. By using SEM and TFM techniques, the relationshipbetween a fatigue crack and microstructures of the steel is established. |
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| Keywords: | Martensite Micro-Structure (Metallography) Fatigue Fracture |
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