【摘要】：由微動產(chǎn)生的裂紋萌生對鋼組件的疲勞強(qiáng)度具有重要影響。本文選擇GCr15軸承鋼,在20kHz超聲疲勞試驗(yàn)機(jī)提供的循環(huán)載荷作用下,測試其超長壽命微動疲勞性能。試驗(yàn)結(jié)果顯示,在109循環(huán)周次下微動疲勞強(qiáng)度影響因子達(dá)到0.37。通過電子掃描電鏡觀察試件磨損面和微動疲勞斷口,并分析了高頻超長壽命微動疲勞斷裂機(jī)理。高周疲勞裂紋通常會在磨損面的粘著區(qū)與滑移區(qū)交界處萌生,超高周疲勞裂紋在粘著區(qū)內(nèi)萌生。微動磨損面的面積以及磨損面的粘著區(qū)都隨著試件疲勞壽命的增加而增加。
[Abstract]:The crack initiation caused by fretting has an important effect on the fatigue strength of steel assemblies. In this paper, GCr15 bearing steel is selected to test the fretting fatigue performance of GCr15 bearing steel under cyclic load provided by 20kHz ultrasonic fatigue tester. The results show that the fretting fatigue strength influence factor is 0.37 under 109 cycles. The wear surface and fretting fatigue fracture surface of the specimen were observed by SEM, and the fracture mechanism of fretting fatigue was analyzed. The high cycle fatigue crack usually germinates at the junction of the adhesion zone and the slip zone of the wear surface, and the ultra high cycle fatigue crack originates in the adhesion zone. The area of fretting wear surface and the adhesive zone of wear surface increase with the increase of fatigue life.
【作者單位】： 四川大學(xué)空天科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(NO.11372201)資助
【分類號】：TG142.1

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本文編號：2393228