| 粉末冶金高温合金FGH97的低周疲劳断裂特征 |
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| 引用本文： | 张莹,张义文,张娜,刘明东,刘建涛.粉末冶金高温合金FGH97的低周疲劳断裂特征[J].金属学报,2010(4). |
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| 作者姓名： | 张莹 张义文 张娜 刘明东 刘建涛 |
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| 作者单位： | 钢铁研究总院高温材料研究所; |
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| 基金项目： | 国家重点基础研究发展计划资助项目2010CB631200~~ |
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| 摘 要： | 研究了粉末冶金镍基高温合金FGH97在650℃,30—980 MPa,1 Hz实验条件下的低周疲劳断口的宏观及微观特征,裂纹源的类型及其形貌特征,以及裂纹源的位置、缺陷类型、形状和尺寸对低周疲劳寿命的影响.结果表明,在本次实验条件下该合金的低周疲劳寿命均超过了5000 cyc;统计得出,低周疲劳断口裂纹源在表面的试样占23%,在亚表面的占47%,在试样内部的占30%;裂纹源分平台、粉末颗粒、夹杂物3种类型,其中平台类型约占5%,粉末颗粒间断裂占15%,夹杂物占80%.由统计分析和计算得出,不同类型裂纹源对疲劳寿命的影响程度不同:夹杂物最严重,其次为异常粉末颗粒,再次为局部塑性变形.
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| 关 键 词： | FGH97粉末冶金高温合金 低周疲劳断口 裂纹源类型 低周疲劳寿命 |
FRACTURE CHARACTER OF LOW CYCLE FATIGUE OF P/M SUPERALLOY FGH97 |
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| ZHANG Ying,ZHANG Yiwen,ZHANG Na,LIU Mingdong,LIU Jiantao Central Iron , Steel Research Institute,High Temperature Material Institute,Beijing.FRACTURE CHARACTER OF LOW CYCLE FATIGUE OF P/M SUPERALLOY FGH97[J].Acta Metallurgica Sinica,2010(4). |
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| Authors: | ZHANG Ying ZHANG Yiwen ZHANG Na LIU Mingdong LIU Jiantao Central Iron Steel Research Institute High Temperature Material Institute Beijing |
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| Affiliation: | ZHANG Ying,ZHANG Yiwen,ZHANG Na,LIU Mingdong,LIU Jiantao Central Iron , Steel Research Institute,High Temperature Material Institute,Beijing 100081 |
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| Abstract: | Powder metallurgy(P/M) nickel-based superalloy FGH97 has been researched in recent 10 years in China which is particularly suitable for producing aircraft engine disks and shafts etc..In the range of operating temperature,the resistance to low cycle fatigue(LCF) of P/M nickelbased superalloy is one of the most important performances.In this paper the fracture features of LCF on P/M nickel-based superalloy FGH97 were investigated.The study focused on macroscopic and microscopic features of LCF fractures unde... |
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| Keywords: | P/M superalloy FGH97 fracture of LCF types of failure origin LCF life |
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