佴启亮,董建新,张麦仓,郑磊,姚志浩,曲敬龙.GH4720Li合金裂纹扩展速率的温度敏感性[J].稀有金属材料与工程,2017,46(10):2915~2921.[Nai Qiliang,Dong Jianxin,Zhang Maicang,Zheng Lei,Yao Zhihao,Qu Jinglong.Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy[J].Rare Metal Materials and Engineering,2017,46(10):2915~2921.]
GH4720Li合金裂纹扩展速率的温度敏感性
投稿时间:2015-06-14  修订日期:2016-02-02
中文关键词:  镍基高温合金  GH4720Li  裂纹扩展速率  温度敏感性
基金项目:国家自然科学基金资助(项目号51371023)
中文摘要:
      测定了难变形高温合金GH4720Li在650℃、700℃、750℃及800℃空气环境下的裂纹扩展速率,并结合断口分析了在纯疲劳及保载条件下温度对合金裂纹扩展速率的影响。结果表明,随着温度升高,合金裂纹扩展速率的增长幅度变大。800℃时,合金的疲劳裂纹扩展速率急剧增大。高温下,疲劳裂纹的扩展方式发生了明显变化,650℃时断口为沿晶和穿晶混合型,700~800℃时裂纹以沿晶断裂为主。保载时间的延长,裂纹扩展速率加快,且裂纹扩展速率的温度敏感性增加。
Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy
英文关键词:nickel-base superalloy  GH4720Li  fatigue crack growth rate  temperature sensitvity
英文摘要:
      The fatigue crack growth rate of difficult-to-deform superalloy GH4720Li are investigated at 650℃, 700℃, 750℃and 800℃. The analysis of temperature effect on fatigue crack growth rate under pure fatigue and fatigue with 90s dwell. The result shows that the fatigue crack growth rate(FCGR) and increasing rate increased as the temperature increased. FCGR increase rapidly at 800℃. Temperature changes the model of the fatigue crack propagation, the fracture mode is the mix of transgranular and intergranular at 650℃, the fracture mode is predominantly inergranular at 700~800℃. The crack growth rate increased significantly with increasing the holding time. The higher test temperature is, the greater effect of dwell time on crack growth rate.
作者单位E-mail
佴启亮 北京科技大学材料科学与工程学院 naiqiliang@126.com 
董建新 北京科技大学材料科学与工程学院  
张麦仓 北京科技大学材料科学与工程学院  
郑磊 北京科技大学材料科学与工程学院  
姚志浩 北京科技大学材料科学与工程学院  
曲敬龙 钢铁研究总院高温材料研究所  
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