本文關鍵詞： 金屬材料 轉子鋼 高溫 超高周疲勞 夾雜物 裂紋擴展門檻值　出處：《材料研究學報》2016年07期 　論文類型：期刊論文

【摘要】：使用自主搭建的高溫超聲疲勞實驗系統(tǒng)在常溫和600℃進行Cr Mo W轉子鋼1×1010周次超高周疲勞實驗,研究了Cr Mo W轉子鋼在工作溫度下的超高周疲勞性能。結果表明:在600℃和常溫下轉子鋼的S-N曲線均呈連續(xù)下降型,試件在109周次后仍發(fā)生疲勞斷裂。在常溫實驗條件下疲勞壽命小于1×107周次試件的裂紋多萌生在表面,而高于1×107周次的多以內部萌生為主。在高溫實驗環(huán)境下裂紋也在內部夾雜處萌生,且裂紋萌生方式對疲勞壽命沒有決定性作用。魚眼定量分析結果表明,Cr Mo W轉子鋼在600℃和常溫下裂紋擴展的應力強度因子門檻值分別為3.4 MPa·m1/2和1.0 MPa·m1/2。
[Abstract]:The use of high temperature ultrasonic fatigue test system of self built high cycle fatigue experiment of Cr Mo W rotor steel 1 * 1010 ultra week at room temperature and 600 DEG C, the ultra high cycle fatigue properties of Cr Mo W rotor steel at the working temperature. The results showed that under normal temperature at 600 DEG C and S-N curve of rotor steel was a continuous decline, the specimen in the 109 week after fracture. Still at room temperature under the experimental conditions the fatigue life of less than 1 x 107 weeks time crack initiated on the surface, and more than 1 * 107 times a week in the internal initiation. In high temperature under the experimental environment in crack initiation of internal inclusions, and the crack initiation mode do not have a decisive role on the fatigue life of fisheye. Quantitative analysis results show that the Cr Mo W rotor steel at 600 DEG C and under normal temperature crack stress intensity factor were 3.4 MPa and 1 MPa - m1/2. - m1/2

【作者單位】： 四川大學建筑與環(huán)境學院;四川大學空天科學與工程學院;上海電氣電站設備有限公司上海汽輪機廠;
【基金】：國家自然基金11172188、11327801和11502151資助項目~~
【分類號】：O346.2
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本文編號：1518538