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GH4720Li合金裂紋擴展速率的溫度敏感性
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北京科技大學材料科學與工程學院,北京科技大學材料科學與工程學院,北京科技大學材料科學與工程學院,北京科技大學材料科學與工程學院,北京科技大學材料科學與工程學院,鋼鐵研究總院高溫材料研究所

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國家自然科學基金資助(項目號51371023)


Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy
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School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,High Temperature Materials Research Institute,Central and Steel Research Institute

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    摘要:

    測定了難變形高溫合金GH4720Li在650℃、700℃、750℃及800℃空氣環(huán)境下的裂紋擴展速率,并結(jié)合斷口分析了在純疲勞及保載條件下溫度對合金裂紋擴展速率的影響。結(jié)果表明,隨著溫度升高,合金裂紋擴展速率的增長幅度變大。800℃時,合金的疲勞裂紋擴展速率急劇增大。高溫下,疲勞裂紋的擴展方式發(fā)生了明顯變化,650℃時斷口為沿晶和穿晶混合型,700~800℃時裂紋以沿晶斷裂為主。保載時間的延長,裂紋擴展速率加快,且裂紋擴展速率的溫度敏感性增加。

    Abstract:

    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.

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佴啟亮,董建新,張麥倉,鄭磊,姚志浩,曲敬龍. GH4720Li合金裂紋擴展速率的溫度敏感性[J].稀有金屬材料與工程,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.]
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  • 收稿日期:2015-06-14
  • 最后修改日期:2016-02-02
  • 錄用日期:2016-02-24
  • 在線發(fā)布日期: 2017-12-01
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