Influence of Heat Treatment on Fatigue Crack Growth Rate of As-cast Nickel-Aluminum Bronze
摘 要
对铸态镍铝青铜(NAB)进行了920 ℃正火和675 ℃退火热处理, 研究了不同状态NAB的显微组织和拉伸性能; 采用直流电压降(DCPD)法测试了其疲劳裂纹扩展速率, 观察了裂纹扩展路径及疲劳断口形貌。结果表明: 退火态与铸态试样的显微组织均由基体α相、残余β相以及三种Ni-Fe-Al金属间化合物相(κⅡ, κⅢ, κⅣ)组成, 而正火态试样组织则由较多的残余β相以及均匀分布的κⅣ相组成, 其强度更高但塑性明显降低; 铸态试样的疲劳裂纹扩展速率最快, 正火态试样的最慢; 铸态和退火态试样中的疲劳裂纹在κ相相界处扩展, 断裂方式主要为脆性解理断裂, 而正火态试样的疲劳裂纹主要穿过α相扩展, 断口出现了疲劳辉纹, 且其疲劳裂纹扩展路径最为曲折。
Abstract
The as-cast nickel-aluminum bronze (NAB) was normalized at 920 ℃ and annealed at 675 ℃ respectively, and then the microstructures and tensile properties of the NAB in different states were studied. The fatigue crack growth rates were measured by direct current potential drop (DCPD) method and the fatigue crack growth path and fracture morphology were observed. The results show that the microstructures of the annealed and as-cast samples both consisted of α phase, residual β phase and three kinds of Ni-Fe-Al intermetallic compounds (κⅡ, κⅢ, κⅣ), while that of the normalized sample consisted of residual β phase and evenly distributed κⅣ phase, which had a much higher strength and a decreased plasticity. The fatigue crack growth rate of the as-cast sample was the fastest while that of the normalized sample was the slowest. The fatigue crack in as-cast and annealed samples propagated from the interface of κ phases and showed a cleavage fracture mode; in normalized sample the fatigue crack propagated through α phase with fatigue striation on the fracture surface and the fatigue crack growth path was the most tortuose.
中图分类号 TL341 DOI 10.11973/jxgccl201610018
所属栏目 材料性能及应用
基金项目 国家重点基础研究发展计划(973计划)项目(2014CB046701)
收稿日期 2015/5/28
修改稿日期 2016/8/30
网络出版日期
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备注胡梦(1990-), 男, 湖北武穴人, 硕士研究生。
引用该论文: HU Meng,XU Xiao-yan,ZHANG Le-fu. Influence of Heat Treatment on Fatigue Crack Growth Rate of As-cast Nickel-Aluminum Bronze[J]. Materials for mechancial engineering, 2016, 40(10): 79~84
胡 梦,徐小严,张乐福. 热处理对铸态镍铝青铜疲劳裂纹扩展速率的影响[J]. 机械工程材料, 2016, 40(10): 79~84
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【3】CZYRYCA E J. Corrosion fatigue crack growth thresholds for cast nickel-aluminum bronze and welds[J]. ASTM Special Technical Publication, 2000, 1372: 319-340.
【4】WHARTON J A, BARIK R C, KEAR G, et al. The corrosion of nickel-aluminium bronze in seawater[J]. Corrosion Science, 2005, 47(12): 3336-3367.
【5】AL-HASHEM A, RIAD W. The role of microstructure of nickel-aluminium-bronze alloy on its cavitation corrosion behavior in natural seawater[J]. Materials Characterization, 2002, 48(1): 37-41.
【6】ANANTAPONG J, UTHAISANGSUK V, SURANUNTCHAI S, et al. Effect of hot working on microstructure evolution of as-cast nickel aluminum bronze alloy[J]. Materials & Design, 2014, 60: 233-243.
【7】CHOPRA O K, RAO A S. A review of irradiation effects on LWR core internal materials-IASCC susceptibility and crack growth rates of austenitic stainless steels[J]. Journal of Nuclear Materials, 2011, 409(3): 235-256.
【8】CULPAN E A, ROSE G. Microstructural characterization of cast nickelaluminium bronze[J]. Journal of Materials Science, 1978, 13(8): 1647-1657.
【9】PARIS P C, ERDOGAN F. A critical analysis of crack propagation laws[J]. Journal of Basic Engineering, 1963, 85(4): 528-533.
【10】WANG Y L, PAN Q L, WEI LL, et al. Effect of retrogression and reaging treatment on the microstructure and fatigue crack growth behavior of 7050 aluminum alloy thick plate[J]. Materials & Design, 2014, 55: 857-863.
【11】SINHA V, SOBOYEJO W O. An investigation of the effects of colony microstructure on fatigue crack growth in Ti-6Al-4V[J]. Materials Science and Engineering A, 2001, 319: 607-612.
【12】SURESH S. Fatigue crack deflection and fracture surface contact: micromechanical models[J]. Metallurgical Transactions A, 1985, 16(1): 249-260.
【13】YODER G R, COOLEY L A, CROOKER T W. Fatigue crack propagation resistance of beta-annealed Ti-6AI-4V alloys of differing interstitial oxygen contents[J]. Metallurgical Transactions A, 1978, 9(10): 1413-1420.
【14】PILCHAK A L. Fatigue crack growth rates in alpha titanium: faceted vs. striation growth[J].Scripta Materialia, 2013, 68(5): 277-280.
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