Ta含量对FGH4098粉末高温合金力学性能的影响
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摘要
研究了不同Ta含量FGH4098合金的冲击韧性(室温),拉伸性能(室温、650℃、750℃)和持久性能(650℃、750℃),以及650℃疲劳裂纹扩展速率,并结合不同Ta含量合金的冲击、拉伸、持久断口和650℃/3 000 h、750℃/3 000 h两种时效处理制度后的显微组织,分析了Ta含量对合金力学性能的影响。结果表明:合金中Ta含量过高会显著降低合金的冲击韧性,Ta含量在1.2%～3.6%(质量分数,下同)间的合金冲击韧性维持在较高水平;随着Ta含量的增加,FGH4098合金室温和高温抗拉强度逐渐增加,Ta含量为1.2%～3.6%的合金,其室温和高温拉伸塑性较好;随着Ta含量的增加,合金650℃持久寿命显著增加,但在750℃下,过量的Ta会促进TCP相的析出,严重影响合金的高温持久性能,Ta含量在2.4%～3.6%时,合金的持久性能最优。随着Ta含量的增加,合金650℃疲劳裂纹扩展速率逐渐降低。综上,Ta含量在2.4%～3.6%间的FGH4098合金的综合力学性能最优。
The impact toughness(room temperature),tensile properties(room temperature,650 ℃,750 ℃),durability(650 ℃,750 ℃)and fatigue crack growth rate at 650 ℃ of FGH4098 alloy with different Ta contents were studied.According to the impact,tensile and durability fracture of alloys with different Ta content,as well as the microstructure of two different aging treatment(650 ℃/3 000 h and 750 ℃/3 000 h),the effect of Ta content on the mechanical properties of the alloy was analyzed. The results show that excessive Ta content decreases the impact toughness badly and alloys with 1.2%-3.6% Ta content(mass percent)can maintain better impact toughness. With the increase of Ta content,the tensile strength at room temperature and high temperature increase,and alloy with 1.2%-3.6% Ta has the best tensile ductility. With the increase of Ta content,the durable life of the alloy at 650 ℃ is obviously increased. However,at750 ℃,excessive Ta will promote the precipitation of TCP phase,seriously affecting the high-temperature durability of the alloy. When Ta content is 2.4%-3.6%,the durability of the alloy is the best. With the increase of Ta content,the fatigue crack growth rate of alloy decreases gradually at 650 ℃. In conclusion,FGH4098 alloy with Ta content between2.4%-3.6% has the best comprehensive mechanical properties.
The impact toughness(room temperature),tensile properties(room temperature,650 ℃,750 ℃),durability(650 ℃,750 ℃)and fatigue crack growth rate at 650 ℃ of FGH4098 alloy with different Ta contents were studied.According to the impact,tensile and durability fracture of alloys with different Ta content,as well as the microstructure of two different aging treatment(650 ℃/3 000 h and 750 ℃/3 000 h),the effect of Ta content on the mechanical properties of the alloy was analyzed. The results show that excessive Ta content decreases the impact toughness badly and alloys with 1.2%-3.6% Ta content(mass percent)can maintain better impact toughness. With the increase of Ta content,the tensile strength at room temperature and high temperature increase,and alloy with 1.2%-3.6% Ta has the best tensile ductility. With the increase of Ta content,the durable life of the alloy at 650 ℃ is obviously increased. However,at750 ℃,excessive Ta will promote the precipitation of TCP phase,seriously affecting the high-temperature durability of the alloy. When Ta content is 2.4%-3.6%,the durability of the alloy is the best. With the increase of Ta content,the fatigue crack growth rate of alloy decreases gradually at 650 ℃. In conclusion,FGH4098 alloy with Ta content between2.4%-3.6% has the best comprehensive mechanical properties.
引文
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[3]黄乾尧,李汉康.高温合金[M].北京:冶金工业出版社,2000.
[4] Groh J R,Mourer D P. Alternate material for elevated temperature turbine cooling plate applications[C]//Proceedings of the Tenth International Symposium on Superalloy. Pennsylvania,2004:101.
[5]杨健,董建新,张麦仓,等.新型镍基粉末高温合金FGH98的高温疲劳裂纹扩展行为研究[J].金属学报,2013,49(1):71.
[6]吴凯,刘国权,胡本芙,等.合金元素对新型镍基粉末高温合金的热力学平衡相析出行为的影响[J].北京科技大学学报,2009,31(6):719.
[7]贾建,陶宇,张义文,等.第三代粉末冶金高温合金René104的研究进展[J].粉末冶金工业,2007,17(3):36.
[8]吴凯,刘国权,胡本芙,等.含Hf和Ta新型镍基高温合金粉末中碳化物相[J].北京科技大学学报,2010,32(11):1464.
[9]吴凯,刘国权,胡本芙,等.新型镍基粉末高温合金微量元素的相研究[J].稀有金属材料与工程,2011,40(2):279.
[10]贾建,陶宇,张义文.第三代粉末高温合金FGH4098的热力学行为研究[J].钢铁研究学报,2011,23(S2):482.
[11]吴超杰,陶宇,贾建.第四代粉末高温合金成分选取范围研究[J].粉末冶金工业,2014,24(1):20.