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,研究了PM FGH95高溫合金在應變率0.0001～0.01 s-1范圍內的拉伸性能及在不同應力比R=-1及R=0下的低周疲勞性能.拉伸試驗結果表明:在此溫度范圍內,應變率對彈性模量、拉伸屈服強度及塑性模量的影響可以忽略不計;并且應變率自0.0001 s-1增大至0.01 s-1時,彈性模量、拉伸屈服強度及塑性模量受溫度的影響也不明顯.PM FGH95合金受材料微結構的影響很大,材料含有的微缺陷對其力學性能有非常不利的影響.LCF試驗結果表明:PM FGH95合金是循環(huán)硬化材料.當應力比R=-1時,溫度對LCF壽命的影響很小;但在應力比R=0時,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,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 關鍵詞： 鎳基粉末冶金FGH95合金    拉伸性能    低周疲勞    應變率影響    溫度效應    斷裂模式    Keywords： nickel-base powder metallurgy superalloy FGH95    tensile property    low cycle fatigue    strain rate effect    temperature effect    fracture mode    機標分類號： TG5 TQ3 機標關鍵詞： 鎳基粉末冶金    高溫合金    拉伸屈服強度    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    應力比    應變率    powder metallurgy    low cycle fatigue    溫度范圍    塑性模量 基金項目： 國家自然科學基金，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】相關文章：

DD3鎳基單晶合金低周疲勞壽命研究04-30

長期時效鎳基高溫合金的組織與力學性能04-27

非對稱循環(huán)載荷下鎳基單晶合金低周疲勞損傷研究04-27

SiC陶瓷與GH128鎳基高溫合金反應連接研究04-28

鎳基單晶合金高溫蠕變的θ映射模型04-26

DD3鎳基單晶合金非對稱循環(huán)載荷低周疲勞壽命預測04-30

鈀改性鎳基高溫合金鋁化物涂層的組織和熱腐蝕性能04-30

鎳基高溫合金電子束釬焊潤濕性及界面產(chǎn)物04-27

激光近形制造鎳基合金的顯微組織及其力學性能04-27

比濁法測定鎳基高溫合金熱腐蝕產(chǎn)物中微量氯04-28