700℃超超临界锅炉用Inconel 740H合金的热塑性
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摘要
研究了不同温度对Inconel 740H合金热塑性的影响。结果表明:Inconel 740H合金在1050~1200℃范围内具有良好的热塑性,拉伸断口处均有明显颈缩现象,为塑性断裂,断面收缩率均在80%以上,且在1150℃左右达到最大值;随着温度的升高,合金断口韧窝增多,塑性越来越好,当温度超过1150℃后断口韧窝减少,塑性开始缓慢下降;随着变形温度的提高,合金的动态再结晶率增大,在1125~1200℃时,可发生完全动态再结晶,当温度超过1150℃后,细小的再结晶晶粒开始缓慢长大。对于Inconel 740H合金热挤压管,在应变速率为1 s~(-1)时,较合适的热变形温度范围为1125~1175℃。
Influence of different temperature on hot ductility of Inconel 740H alloy was studied. The results show that the alloy has good hot ductility in the range of 1050-1200℃,which obvious necking occurs at the tensile fracture,so that it's plastic fracture. The percentage reduction of area are above 80% and reaches the maximum at 1150℃. With the temperature rising,the number of dimple increases and the plasticity becomes better and better,however,when the temperature exceeds 1150℃,the number of dimple decreases and the plasticity begins to decrease slowly. The dynamic recrystallization rate of the alloy increases with the increase of the deformation temperature,and the full dynamic recrystallization can occur in the range of 1125-1200 ℃. When the temperature exceeds 1150℃,the fine recrystallized grains begin to grow slowly. Thus,it can be concluded that for the Inconel 740H alloy hot extrusion pipe,the suitable heat deformation temperature range is 1125-1175℃ at the strain rate of 1 s~(-1).
Influence of different temperature on hot ductility of Inconel 740H alloy was studied. The results show that the alloy has good hot ductility in the range of 1050-1200℃,which obvious necking occurs at the tensile fracture,so that it's plastic fracture. The percentage reduction of area are above 80% and reaches the maximum at 1150℃. With the temperature rising,the number of dimple increases and the plasticity becomes better and better,however,when the temperature exceeds 1150℃,the number of dimple decreases and the plasticity begins to decrease slowly. The dynamic recrystallization rate of the alloy increases with the increase of the deformation temperature,and the full dynamic recrystallization can occur in the range of 1125-1200 ℃. When the temperature exceeds 1150℃,the fine recrystallized grains begin to grow slowly. Thus,it can be concluded that for the Inconel 740H alloy hot extrusion pipe,the suitable heat deformation temperature range is 1125-1175℃ at the strain rate of 1 s~(-1).
引文
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[2]Viswanathan R.Materials technology for coal-fired power plants[J].Advanced Materials and Processes,2004,162(8):73-76.
[3]Zhao S,Xie X,Smith G D,et al.Research and Improvement on structure stability and corrosion resistance of nickel-base superalloy Inconel alloy 740[J].Materials and Design,2006,27(10):1120-1127.
[4]毛健雄.700℃超超临界机组高温材料研发的最新进展[J].电力建设,2013,34(8):69-76.Mao Jianxiong.Latest development of high-temperature metallic materials in 700℃ultra-supercritical units[J].Electric Power Construction,2013,34(8):69-76.
[5]Zhao S,Xie X,Smith G D,et al.Gamma prime coarsening and agehardening behaviors in a new nickel base superalloy[J].Materials Letters,2004,58(11):1784-1787.
[6]Zhou R,Tang L,Wang B,et al.Effect of heat treatment on the microstructure and properties of cold-worked Inconel 740H boiler tubes[C]//Energy Materials 2014.John Wiley and Sons,Inc.2015:279-285.
[7]You X,Tan Y,Li J,et al.Effects of solution heat treatment on the microstructure and hardness of Inconel 740 superalloy prepared by electron beam smelting[J].Journal of Alloys and Compounds,2015,638:239-248.
[8]Zhao S Q,Jiang Y,Dong J X,et al.Experimental investigation and thermodynamic calculation on phase precipitation of inconel 740[J].Acta Metallurgica Sinica(English Letters),2006,19(6):425-431.
[9]Lu J T,Li Y,Yang Z,et al.Fireside corrosion behaviors of inconel740H superalloy in various SO2,contents[C]//Energy Materials2017.Springer International Publishing,2017,193-201.
[10]Chong Yan,Liu Zhengdong,Godfrey Andy,et al.Heat treatment of a candidate material for 700℃A-USC power plants[J].Journal of Iron and Steel Research,International,2015,22(2):150-156.
[11]赵双群,谢锡善,董建新.700℃超超临界燃煤电站用镍基高温合金Inconel740/740H的组织与性能[C]//电站金属材料学术年会论文集(第二卷).成都,2011:16-26.
[12]徐松乾,王婷婷.700℃先进超超临界机组过/再热器材料CHRA-1合金组织稳定性研究[J].热力发电,2016,45(6):63-69.Xu Songqian,Wang Tingting.Investigation on microstucture stability of C-HRA-1 used for superheater/reheater in 700℃advanced ultrasupercritical unit[J].Thermal Power Generation,2016,45(6):63-69.
[13]党莹樱,赵新宝,尹宏飞,等.Inconel 740H合金750℃长期时效后的组织稳定性[J].材料工程,2016,44(9):58-62.Dang Yingying,Zhao Xinbao,Yin Hongfei,et al.Microstructure stability of Inconel 740H alloy after long term exposure at 750℃[J].Journal of Materials Engineering,2016,44(9):58-62.
[14]王珏,吴赟,董建新,等.700℃超超临界锅炉材料GH4700合金铸态组织及均匀化工艺[J].稀有金属材料与工程,2013,42(9):1908-1914.Wang Jue,Wu Yun,Dong Jianxin,et al.Microstructure and homogenization of as-cast GH4700 alloy for 700℃ultra-supercritical boilers[J].Rare Metal Materials and Engineering,2015,37(3):1-6.
[15]赵海平,徐松乾.热交换器用C-HRA-1合金的热加工特性研究[J].上海金属,2015,37(3):1-6.Zhao Haiping,Xu Songqian.Hot working characteristics of C-HRA-1alloy for heat exchanger[J].Shanghai Metals,2015,37(3):1-6.
[16]李莎,曾莉,李阳,等.700℃超超临界锅炉用GH4700镍基合金的热加工性能[J].金属热处理,2013,38(11):80-83.Li Sha,Zeng Li,Li Yang,et al.Hot working performance of GH4700Ni-based alloy for 700℃ultra-supercritical boiler[J].Heat Treatment of Metals[J].Heat Treatment of Metals,2013,38(11):80-83.
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