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鎳基粉末冶金FGH95高溫合金的拉伸及低周疲勞性能研究
摘要：在420～650℃的溫度范圍內(nèi),研究了PM FGH95高溫合金在應(yīng)變率0.0001～0.01 s-1范圍內(nèi)的拉伸性能及在不同應(yīng)力比R=-1及R=0下的低周疲勞性能.拉伸試驗(yàn)結(jié)果表明:在此溫度范圍內(nèi),應(yīng)變率對彈性模量、拉伸屈服強(qiáng)度及塑性模量的影響可以忽略不計(jì);并且應(yīng)變率自0.0001 s-1增大至0.01 s-1時(shí),彈性模量、拉伸屈服強(qiáng)度及塑性模量受溫度的影響也不明顯.PM FGH95合金受材料微結(jié)構(gòu)的影響很大,材料含有的微缺陷對其力學(xué)性能有非常不利的影響.LCF試驗(yàn)結(jié)果表明:PM FGH95合金是循環(huán)硬化材料.當(dāng)應(yīng)力比R=-1時(shí),溫度對LCF壽命的影響很小;但在應(yīng)力比R=0時(shí),LCF壽命受溫度的影響很大,且隨著溫度的增加材料的低周疲勞壽命減小.SEM斷口掃描發(fā)現(xiàn),斷裂表面有很多的解理面,但沒有疲勞條帶,且此斷裂模式下沒有明顯的塑性變形,所以FGH95合金的低周疲勞壽命幾乎是由裂紋萌生階段決定的.Abstract：The tensile behavior of a nickel-base powder metallurgy(PM)FGH95 superalloy was studied in the temperature range from 420℃ to 650℃ with strain rate from 0.0001 s-1 to 0.01 s-1.The low cycle fatigue(LCF)behavior of this superalloy was investigated in the temperature range from 420℃ to 650℃ under push-pull mode(R=-1)and pull mode (R=0)at strain rate of 0.001 S-1.The results of tensile testing show that the effect of strain rate on the Youngs modulus,tensile yield strength,and plastic modulus can be neglected in the experimental temperature range.And the influence of temperature on the Youngs modulus,tensile yield strength,and plastic modulus is not obvious in the strain rate range from 0.000 1 s-1 to O.01 s-1.The PM FGH95 is sensitive to the micro-defect.which has a significant deleterious effect on FGH95 material mechanical behavior.The results of LCF reveal that the PM FGH95 is the cyclic hardening material.For mode R=-1.the effect of temperature on LCF life can be neglected;but for mode R=0,the temperature has profound influence on the LCF life.At this case,the LCF life decreases drastically with the temperature increasing.The SEM investigation of LCF specimens shows that there are a lot of cleavages on fracture surface,fatigue striations are absent,and this fracture mode may not involve significant plastic deformation.So the LCF life of PM FGH95 is almost determined by the crack initiation stage. 作者： 崔偉華萬建松岳珠峰楊治國 Author： Cui Weihua Wan Jiansong Yue Zhufeng Yang Zhiguo 作者單位： 西北工業(yè)大學(xué),陜西西安,710072 期 刊： 稀有金屬材料與工程 ISTICEISCIPKU Journal： RARE METAL MATERIALS AND ENGINEERING 年，卷(期)： 2007, 36(12) 分類號： V256 V250.3 關(guān)鍵詞： 鎳基粉末冶金FGH95合金 拉伸性能 低周疲勞 應(yīng)變率影響 溫度效應(yīng) 斷裂模式 Keywords： nickel-base powder metallurgy superalloy FGH95 tensile property low cycle fatigue strain rate effect temperature effect fracture mode 機(jī)標(biāo)分類號： TG5 TQ3 機(jī)標(biāo)關(guān)鍵詞： 鎳基粉末冶金 高溫合金 拉伸屈服強(qiáng)度 低周疲勞 性能研究 Powder Metallurgy Nickel base temperature range strain rate yield strength 溫度的影響 influence of temperature plastic deformation mechanical behavior 應(yīng)力比 應(yīng)變率 powder metallurgy low cycle fatigue 溫度范圍 塑性模量 基金項(xiàng)目： 國家自然科學(xué)基金，Chinese Aviation Research Foundation【鎳基粉末冶金FGH95高溫合金的拉伸及低周疲勞性能研究】相關(guān)文章：
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