Ti-22Al-25Nb合金双板条组织的高温疲劳性能
High temperature fatigue properties of Ti-22Al-25Nb alloy double slats
孙玉鑫 1马雄 2梁晓波 2韩潮雨 2史晓强 2赵洪泽2
作者信息
- 1. 烟台大学精准材料高等研究院,山东烟台 264005;北京钢研高纳科技股份有限公司,北京 100081;钢铁研究总院有限公司,北京 100081
- 2. 北京钢研高纳科技股份有限公司,北京 100081;钢铁研究总院有限公司,北京 100081
- 折叠
摘要
研究了 Ti-22Al-25Nb合金双板条组织在300、500和700 ℃下的轴向高周疲劳行为,并对疲劳试样的断口与组织形貌进行了表征.结果发现:3种温度下Ti-22Al-25Nb合金双板条组织的条件疲劳极限分别为510、338和356 MPa.300 ℃试样的裂纹既有表面形核也有内部形核,500和700 ℃试样的裂纹均起源于试样表面.300 ℃的疲劳条纹呈现脆性条带特征,500 ℃呈现间断与连续的过渡条纹,而700 ℃则表现为塑性条纹.细小针状O相板条区域容易产生裂纹,而粗大片状板条在裂纹扩展路径上起到阻碍作用,有利于提高材料的疲劳寿命.
Abstract
The axial high-cycle fatigue behavior of Ti-22Al-25Nb alloy multi-scale double slats at 300,500 and 700℃ was studied,and the fracture and structure morphology of fatigue samples were characterized.The results showed that the fatigue limits were 510,338 and 356 MPa,respectively.The cracks of 300 ℃ samples have both surface and internal nucleation,and the cracks of 500 and 700 ℃ samples originated from the surface of the sam-ples.The fatigue striations at 300 ℃ show the characteristics of brittle bands,the intermittent and continuous tran-sition striations at 500 ℃,and the plastic striations at 700 ℃.Small acicular O-phase slats are prone to crack,while large sheet slats hinder the crack propagation path,which is conducive to improving the fatigue life of the ma-terial.
关键词
Ti-22Al-25Nb合金/双板条组织/高周疲劳/断口形貌Key words
Ti-22Al-25Nb alloy/double lath structure/high cycle fatigue/fracture morphology引用本文复制引用
基金项目
国家科技重大专项经费资助(2017-VI-0004-0074)
出版年
2024
NETL
NSTL
万方数据