摘要
实验对比研究了两种结构不同的钛合金 [Ti6Al4V (α +β型 )和Ti5Al2 .5Sn(α型 ) ]和两种结构相同 (马氏体 )但强度与硬度差别较大的耐热不锈钢 (lCr11Ni2W 2MoV和Cr17Ni2 )的微动疲劳 (FF)抗力及微动垫材料的影响 ,以进一步探讨材料因素对FF抗力的作用规律和机制。在本文实验条件下 ,具有较高强度和疲劳极限的Ti6Al4V钛合金和Cr17Ni2耐热不锈钢的FF抗力分别高于Ti5Al2 .5Sn钛合金和 1Cr11Ni2W2MoV钢 ,即在材料组织结构相同或相近的条件下 ,屈服强度和疲劳极限决定FF抗力 ;当材料与高硬度配副接触时 ,FF裂纹易于萌生 ,FF损伤倾向增大 ,此时喷丸形变强化可更有效地提高材料的FF抗力。
The fretting fatigue resistance (FFR) of materials is related to composition, microstructure, and mechanical properties of the materials. The relationship is different for different materials. In order to further investigate the influence of material factors on FFR, the FFR of two heat-resistant steels with different tension strength and two titanium alloys with different microstructure was compared. Fretting pad material on FFR was also studied in the present paper. The results show that the FFR of Ti6Al4V and Cr17Ni2 with high tension and plain fatigue strength is higher than that of Ti5Al2.5Sn and 1Cr11Ni2W2MoV respectively. Which means that FFR is predominantly determined by tension and plain fatigue strength for the materials having same or similar microstructure. In the situation of using a hard fretting fad, fretting fatigue crack initiates easily and the fretting fatigue life is low. Under this condition, shot peening is remarkable effective for improving FFR of materials.
出处
《航空材料学报》
EI
CAS
CSCD
2001年第2期18-21,29,共5页
Journal of Aeronautical Materials
基金
航空基础科学基金 (98H5 30 86 )
陕西省自然科学研究计划项目 (2 0 0 0C0 1)
关键词
微动疲劳
钛合金
耐热不锈钢
喷丸强化
材料因素
作用规律
Composition effects
Corrosion fatigue
Crack propagation
Crystal microstructure
Fretting corrosion
Heat resistance
Materials testing
Shot peening
Steel
Tensile strength
Titanium alloys
