氮对K4169合金微观组织和力学性能的影响
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摘要
采用Thermo-Calc模拟计算、差热分析和等温凝固淬火试验(ISQ)相结合的方法,借助OM、SEM、EPMA及TEM等表征设备,系统研究了氮含量对K4169合金凝固组织演变行为、元素偏析行为以及力学性能的影响规律。结果表明,氮含量从17μg/g增大到100μg/g,合金中碳化物、氮化物的体积分数增大,氮化物析出温度升高。氮含量会影响碳化物的数量和形貌:在氮含量<50μg/g的合金中,MC型碳化物数量较多,尺寸较大且呈条状形貌;在氮含量为70μg/g和100μg/g的合金中大尺寸MC型碳化物数量显著减少,条型MC碳化物转变为块状。氮含量对K4169合金室温拉伸性能无明显影响,对高温持久性能影响很大。氮含量由17μg/g增大到100μg/g时,合金的高温持久寿命和延伸率分别从300 h和3%下降到2.26 h和2.34%。当氮含量超过30μg/g时,合金的持久性能发生显著下降,因此,K4169合金的氮含量应控制在30μg/g以内比较合理。
The influence of nitrogen content on the microstructure and mechanical properties of superalloy K4169 was investigated through Thermo-Calc calculation, DSC analysis and quenching experiments with optical microscopy(OM), scanning electronic microscopy(SEM),electron-probe micro-analyzer(EPMA) and transmission electron microscope(TEM). The results indicate that when the content of nitrogen in the alloy increases from 17 to 100 μg/g, the precipitation temperature and the quantities of carbides and nitirides are also increased. Moreover it has been proved that the morphologies and amount of carbides can be greatly affected by the content of the nitrogen. A number of large bar-like carbides can be identified when the N content is less than 50 μg/g and this number is decreased significantly when the content of N is increased to70 and 100 μg/g. With the increasing content of N, the morphologies of MC carbides are changed from bar-like to block-like. The elevated temperature performance of this alloy can be greatly affected by the N content while the room temperature performance is rarely changed. When the content of N increases from 17 to 100 μg/g, the creep-rupture life and elongation are decreased from 300 h and 3% to 2.26 h and 2.34%,respectively. Based on this research, as an overall consideration, it is rational to control the N content below 30 μg/g in K4169 alloy.
The influence of nitrogen content on the microstructure and mechanical properties of superalloy K4169 was investigated through Thermo-Calc calculation, DSC analysis and quenching experiments with optical microscopy(OM), scanning electronic microscopy(SEM),electron-probe micro-analyzer(EPMA) and transmission electron microscope(TEM). The results indicate that when the content of nitrogen in the alloy increases from 17 to 100 μg/g, the precipitation temperature and the quantities of carbides and nitirides are also increased. Moreover it has been proved that the morphologies and amount of carbides can be greatly affected by the content of the nitrogen. A number of large bar-like carbides can be identified when the N content is less than 50 μg/g and this number is decreased significantly when the content of N is increased to70 and 100 μg/g. With the increasing content of N, the morphologies of MC carbides are changed from bar-like to block-like. The elevated temperature performance of this alloy can be greatly affected by the N content while the room temperature performance is rarely changed. When the content of N increases from 17 to 100 μg/g, the creep-rupture life and elongation are decreased from 300 h and 3% to 2.26 h and 2.34%,respectively. Based on this research, as an overall consideration, it is rational to control the N content below 30 μg/g in K4169 alloy.
引文
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[2]Meng Nan(孟南),Li Dongming(李东明).Research on Metallic Materials(金属材料研究)[J],2007,33:33
[3]Wang Huiyang(王会阳),An Yunqi(安云岐),Li Chengyu(李承宇)et al.Materials Review(材料导报)[J],2011(S2):482
[4]Liu Yongchang(刘永长),Guo Qianying(郭倩颖),Li Chong(李冲)et al.Acta Metallurgica Sinica(金属学报)[J],2016,52(10):1259
[5]Yuan Chao(袁超),Guo Jianting(郭建亭),Li Gusong(李谷松)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2011,21(4):733
[6]Fu Shuhong,Dong Jianxin,Zhang Maicang et al.Proceedings of the Fifth International Conference on Physical and Numerical Simulation of Materials Processing[J],2009,499:215
[7]Huang Xuebing,Zhang Yun,Liu Yulin et al.Metallurgical and Materials Transactions A[J],1997,28(10):2143
[8]Wei Xianping,Zheng Wenjie,Song Zhigang.Journal of Iron and Steel Research(International)[J],2013,20:88
[9]Huang Xuebing,Zhang Yun,Hu Zhuangqi.Metallurgical and Materials Transactions A[J],1999,30A(7):1755
[10]Sinha O P,Chatterjee M,Sarma V V R S et al.Bulletin of Materials Science[J],2005,28(7):379
[11]Zhang Yexin(张业欣),Wang Wanlin(王万林).Metal Materials and Metallurgy Engineering(金属材料与冶金工程)[J],2015,43(8):28
[12]Cui Xuhui(崔旭辉),Xu Yunbo(许云波),Wang Zhaodong(王昭东)et al.Research on Iron and Steel(钢铁研究)[J],2004(5):36
[13]Tian Sugui(田素贵),Xie Guangwan(谢广亮),Xie Jun(谢君).Transactions of Materials and Heat Treatment(材料热处理学报)[J],2013,34(7):187
[14]Wang Ling(王玲),Cai Wenjing(蔡文静),Liu Lin(刘林).Foundry Technology(铸造技术)[J],2012,33(10):1191
[15]Mitchell A,Cockcroft S L,Schvezov C E et al.High Temperature Materials and Processes[J],1996,15(11):27
[16]Chai Guoming(柴国明),Chen Xichun(陈希春),Guo Hanjie(郭汉杰)et al.Special Casting&Nonferrous Alloys(特种铸造及有色合金)[J],2011,21:1079
[17]Chai Guoming(柴国明),Chen Xichun(陈希春),Guo Hanjie(郭汉杰).The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2012,22(8):2205
[18]АверинB B.Translated by Yu Xinchang(余新昌).Nitrogen in Metal(金属中的氮)[M].Beijing:Metallurgical Industry Press,1981:1
[19]Zhang Xiaoyu(张晓宇),Wang Zhongtang(王忠堂),Cheng Ming(程明)et al.Journal of Shenyang Ligong University(沈阳理工大学学报)[J],2013,32(4):64
[20]Chen Xichun,Shi Chengbin,Guo Hanjie et al.Metallurgical and Materials Transactions B[J],2012,43B(12):1596
[21]Yang Jinxia(杨金侠),Wei Wei(魏薇),Liu Lu(刘路)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2016,45(4):976
[22]Kishkin S T,Stroganov G B.Journal of Aeronautical Materials[J],1991,11(12):1
[23]Zhong Qunpeng(钟群鹏),Zhao Yuhua(赵予华),Zhang Zheng(张峥).Journal of Mechanical Strength(机械强度)[J],2005,27(3):358
[24]Jung B Singh,Amit Verma,Bhaskar Paul et al.Engineering Failure Analysis[J],2013,32:276
[25]Zheng Lei(郑磊),Dong Jianxin(董建新),Zhang Maicang(张麦仓)et al.Materials Review(材料导报)[J],2009,23(9):67