本文關(guān)鍵詞： 金屬材料 轉(zhuǎn)子鋼 高溫 超高周疲勞 夾雜物 裂紋擴(kuò)展門檻值　出處：《材料研究學(xué)報(bào)》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(shí)驗(yàn)系統(tǒng)在常溫和600℃進(jìn)行Cr Mo W轉(zhuǎn)子鋼1×1010周次超高周疲勞實(shí)驗(yàn),研究了Cr Mo W轉(zhuǎn)子鋼在工作溫度下的超高周疲勞性能。結(jié)果表明:在600℃和常溫下轉(zhuǎn)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(shí)驗(yàn)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(nèi)部萌生為主。在高溫實(shí)驗(yàn)環(huán)境下裂紋也在內(nèi)部夾雜處萌生,且裂紋萌生方式對(duì)疲勞壽命沒有決定性作用。魚眼定量分析結(jié)果表明,Cr Mo W轉(zhuǎn)子鋼在600℃和常溫下裂紋擴(kuò)展的應(yīng)力強(qiáng)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(xué)建筑與環(huán)境學(xué)院;四川大學(xué)空天科學(xué)與工程學(xué)院;上海電氣電站設(shè)備有限公司上海汽輪機(jī)廠;
【基金】：國(guó)家自然基金11172188、11327801和11502151資助項(xiàng)目~~
【分類號(hào)】：O346.2
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本文編號(hào)：1518538