期刊文献+

组织特征对GH864合金裂纹扩展行为的影响 被引量:7

Microstructure and Crack Propagation Behavior of GH864 alloy
下载PDF
导出
摘要 测试不同热处理条件下GH864合金在650℃空气中疲劳/蠕变交互作用下的裂纹扩展速率,分析热处理制度及组织特征对合金裂纹扩展速率的影响。通过组织分析试验、裂纹扩展速率试验和断口形貌分析,对比不同组织状态下GH864合金的微观组织及裂纹扩展行为,并用Paris公式对裂纹扩展速率的结果进行描述。结果表明:热处理后合金的裂纹扩展速率都明显降低;晶粒度对合金的裂纹扩展速率影响较大,且粗晶组织能显著降低裂纹扩展速率;晶界析出相对裂纹扩展速率有较大作用,而强化相γ?相大小对裂纹扩展速率影响不明显。从组织形貌及断口分析可较好解释不同热处理制度裂纹扩展速率曲线的试验结果。具有疲劳条纹特征断口对应较慢的裂纹扩展速率,而沿晶断裂对应较快的裂纹扩展速率。 Crack propagation rates after different heat treatments for GH864 alloy are measured under fatigue/creep interaction condition at 650℃ in air. The influence of heat treatment and microstructure are analyzed. The microstructure and crack propagation behavior of GH864 alloy are studied by means of microstructure analysis, fatigue crack growth and fracture morphology analysis. The crack propagation rates have a good description by Paris formula. The results indicate that the fatigue crack growth rates of alloys are decreased after these heat treatments; the grain sizes affect strongly on crack propagation rates and the coarse grain structure obviously reduces the fatigue crack growth; the precipitations of grain boundary is important to the crack propagation rate of GH864 alloy, but the size ofγ prime phase strengthen particles has little effect on the fatigue crack growth. The microstructure morphology and fracture analysis can well explain the test results of crack propagation curves after different heat treatments. The fracture with fatigue striation character corresponds to the lower crack growth rates, while the intergranular fracture corresponds to higher rates.
出处 《机械工程学报》 EI CAS CSCD 北大核心 2009年第5期79-84,共6页 Journal of Mechanical Engineering
基金 国家自然科学基金资助项目(50771011)
关键词 GH864合金 裂纹扩展速率 显微组织 断口分析 GH864 alloy Fatigue crack growth Microstructure Fracture analysis
  • 引文网络
  • 相关文献

参考文献11

  • 1赵双群,谢锡善.WASPALOY合金长期时效过程中的组织演变和性能变化[J].机械工程材料,2006,30(10):62-65. 被引量:11
  • 2董建新,丁利生,王振德.烟气轮机涡轮盘和叶片用WASPALOY合金研究[J].中国材料科技与设备,2006,3(2):68-73. 被引量:18
  • 3LIU Xingbo, KANG Bruce, CHANG Keh-Minn. The effect of hold-time on fatigue crack growth behaviors of WASPALOY alloy at elevated temperature[J]. Materials science and Engineering, 2003, A304: 8-14.
  • 4MERRICK H F, FLOREEN S. The effects of microstructure on elevated temperature crack growth in nickel-based alloys[J]. Metallurgical Transactions A, 1978(9): 231-236.
  • 5CHANG Keh-Minn, LIU Xingbo. Effect of γ' content on the mechanical behavior of the waspaloy alloy system[J]. Materials Science and Engineering, 2001, A308: 1-8.
  • 6WOODFORD D A. Gas phase embitterment and time dependent cracking of nickel based superalloys[J]. Energy materials, 2006(1): 59-79.
  • 7SADANANDA K, VASUDEVAN A K. Analysis of high temperature fatigue crack growth behavior[J]. International Journal of Fatigue, 1997 (19): 183-189.
  • 8MAO Jian, CHANG Keh-Minn, YANG Wanhong. Cooling precipitation and strengthening study in powder metallurgy superalloy Rene88DT[J]. Materials Science and Engineering, 2002, A332: 318-329.
  • 9OSINKOLU G A, ONOFRIO G, MARCHINNI M M. Fatigue crack growth in polycrystalline IN 718 superalloy[J]. Materials Science and Engineering, 2003, A356: 425-433.
  • 10GAYDA J, MINER R V. Fatigue crack initiation and propagation in several nickel-base superalloys at 650 ℃[J]. International Journal of Fatigue, 1984, 5(3): 135-143.

二级参考文献7

共引文献27

同被引文献92

引证文献7

二级引证文献34

相关主题

;
使用帮助 返回顶部