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金属学报  2007, Vol. 43 Issue (10): 1031-1036     
  论文 本期目录 | 过刊浏览 |
中碳高强度弹簧钢NHS1超高周疲劳破坏行为
聂义宏;惠卫军;傅万堂;翁宇庆;董瀚
燕山大学材料科学与工程学院亚稳材料制备技术与科学国家重点实验室; 秦皇岛 066004
引用本文:

聂义宏; 惠卫军; 傅万堂; 翁宇庆; 董瀚 . 中碳高强度弹簧钢NHS1超高周疲劳破坏行为[J]. 金属学报, 2007, 43(10): 1031-1036 .

全文: PDF(546 KB)  
摘要: 研究了中碳高强度弹簧钢NHS1的超高周(109循环周次)疲劳破坏行为,并利用FESEM对疲劳断口进行了观察。实验结果表明,NHS1钢的S-N曲线呈台阶型,在109循环周次内疲劳极限消失。疲劳断口分析表明,在高应力幅区,实验钢的疲劳破坏主要起源于表面基体,而在低应力幅长寿命区,疲劳破坏主要起裂于试样内部的夹杂物,形成“鱼眼”型断裂;在夹杂物周围存在一个粗造的粒状亮区(GBF)。GBF区边界的应力场强度因子值为3.6 MPa•m1/2,该值与疲劳裂纹扩展的门槛值相等。“鱼眼”边界的应力场强度因子同样与疲劳寿命无关,是一个常数,约10.6 MPa•m1/2。
关键词 中碳高强度弹簧钢超高周疲劳鱼眼型断裂    
Abstract:Ultra high cycle fatigue behavior of a new kind of medium-carbon high strength spring steel (NHS1) was investigated and its fractographs were observed by means of field emission scanning electron microscope (FESEM). It was found that the S-N curve of NHS1 steel is a step-wise curve, and the fatigue limit eliminated in 109 cyc regime. Analysis of fractographs shows that surface fracture occurred in the region of short fatigue life at high stress amplitude level and interior inclusion-induced fracture in the region of long fatigue life at low stress amplitude level. Fish-eye marks were always observed around the interior inclusions on the fracture surfaces and a granular bright facet (GBF) was observed in the vicinity around the inclusion. The stress intensity factor range at GBF boundary △KGBF is 3.6 MPa•m1/2, which is just equal to the threshold stress intensity range △Kth. The stress intensity factor range at fish-eye boundary△KFE is also a constant and is 10 MPa•m1/2.
Key wordsmedium-carbon high strength spring steel    ultra high cycle fatigue    fish-eye fracture    fatigue crack gr
收稿日期: 2007-03-30     
ZTFLH:  TG142.1  
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