再结晶对定向凝固镍基高温合金DZ406高温拉伸性能的影响
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摘要
对定向凝固镍基高温合金DZ406分别进行强度为0. 3 MPa、0. 5 MPa的1 min表面喷砂,经过热处理后得到不同厚度的再结晶层,通过SEM及拉伸试验机研究了再结晶层厚度对DZ406合金870℃高温拉伸性能的影响。结果表明,经不同强度喷砂处理的合金在热处理过程后均产生等轴状的再结晶晶粒。0. 3 MPa喷砂后再结晶层平均厚度为15μm,而经0. 5 MPa喷砂后合金再结晶层平均厚度达到25μm,再结晶层厚度随喷砂强度的增大而增加。DZ406合金870℃高温拉伸性能随再结晶的产生而明显降低,但不同再结晶层厚度对DZ406合金高温拉伸性能的影响不大。再结晶产生的横向晶界在高温拉伸过程中成为裂纹萌生区,是造成DZ406合金拉伸性能降低的主要原因。
The directionally solidified nickel-based superalloy DZ406 was treated by grit blasting at 0. 3 MPa and 0. 5 MPa for 1 min. After heat treatment,recrystallized layers of different thickness were obtained,and the effect of recrystallization on the high temperature tensile properties of DZ406 alloy at 870 ℃ was studied by means of SEM and tensile tester. The results show that the alloys blasted with different strengths can produce equiaxed recrystallization grain after heat treatment. The average thickness of the recrystallized layer after blasting at 0. 3 MPa is 15 μm,while that after blasting at 0. 5 MPa reaches 25 μm. The thickness of the recrystallized layer increases with the increase of blasting strength. The high temperature tensile properties of DZ406 alloy at 870 ℃ are significantly reduced with the generation of recrystallization,but different thickness of recrystallized layer has little effect on the high temperature tensile properties of DZ406 alloy. The transverse grain boundary produced by recrystallization becomes a crack initiation that during the high-temperature stretching process,which is the main reason for the decrease of tensile properties of DZ406 alloy.
The directionally solidified nickel-based superalloy DZ406 was treated by grit blasting at 0. 3 MPa and 0. 5 MPa for 1 min. After heat treatment,recrystallized layers of different thickness were obtained,and the effect of recrystallization on the high temperature tensile properties of DZ406 alloy at 870 ℃ was studied by means of SEM and tensile tester. The results show that the alloys blasted with different strengths can produce equiaxed recrystallization grain after heat treatment. The average thickness of the recrystallized layer after blasting at 0. 3 MPa is 15 μm,while that after blasting at 0. 5 MPa reaches 25 μm. The thickness of the recrystallized layer increases with the increase of blasting strength. The high temperature tensile properties of DZ406 alloy at 870 ℃ are significantly reduced with the generation of recrystallization,but different thickness of recrystallized layer has little effect on the high temperature tensile properties of DZ406 alloy. The transverse grain boundary produced by recrystallization becomes a crack initiation that during the high-temperature stretching process,which is the main reason for the decrease of tensile properties of DZ406 alloy.
引文
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[14]张仕朝,李莉,侯学勤.第二代定向柱晶高温合金低周疲劳行为研究[J].机械强度,2017,39(2):311-315.Zhang Shichao,Li Li,Hou Xueqin.Low-cycle fatigue of the second generation directionally solidified superalloy[J].Journal of Mechanical Strength,2017,39(2):311-315.
[15]时海芳,任鑫.材料力学性能[M].北京:北京大学出版社,2015:154.
[2]Babu S S,Miller M K,Vitek J M,et al.Characterization of the microstructure evolution in a nickel base superalloy during continuous cooling conditions[J].Acta Materialia,2001,49(20):4149-4160.
[3]Ding Q,Li S,Chen L Q,et al.Re segregation at interfacial dislocation network in a nickel-based superalloy[J].Acta Materialia,2018,154:137-146.
[4]Laplanche G,Wieczorek N,Fox F,et al.On the influence of crystallography and dendritic microstructure on micro shear behavior of single crystal nibased superalloys[J].Acta Materialia,2018,160:173-184.
[5]任维鹏,李青,李相辉,等.定向镍基高温合金DZ466及其热障涂层的抗热腐蚀性能[J].金属热处理,2018,43(8):213-219.Ren Weipeng,Li Qing,Li Xianghui,et al.Hot corrosion resistance of direct solidified Ni-based superalloy DZ466 and its thermal barrier coat[J].Heat Treatment of Metals,2018,43(8):213-219.
[6]史振学,王效光,杨万鹏,等.热暴露温度对单晶高温合金持久性能的影响[J].金属热处理,2018,43(5):1-5.Shi Zhenxue,Wang Xiaoguang,Yang Wanpeng,et al.Effect of thermal exposure temperature on stress rupture properties of single crystal superalloy[J].Heat Treatment of Metals,2018,43(5):1-5.
[7]彭胜,周兰章,侯介山,等.DZ417G镍基定向凝固高温合金的再结晶[J].金属学报,2010,46(8):907-912.Peng Sheng,Zhou Lanzhang,Hou Jieshan,et al.The recrystallization of Ni base directionally solidified superalloy DZ417G[J].Acta Metallurgica Sinica,2010,46(8):907-912.
[8]申健,濮晟,任建军,等.定向凝固高温合金DZ125L的变形和再结晶[J].材料研究学报,2012,26(6):632-636.Shen Jian,Pu Sheng,Ren Jianjun,et al.Investigation of deformation and recrystallization in a directionally solidified superalloy[J].Chinese Journal of Materials Research,2012,26(6):632-636.
[9]高玉魁.喷丸强化对DD6单晶高温合金高温旋转弯曲疲劳性能的影响[J].金属热处理,2009,34(8):60-61.Gao Yukui.Influence of shot peening on high temperature rotating bending fatigue property of DD6 single crystal superalloy[J].Heat Treatment of Metals,2009,34(8):60-61.
[10]Xiong J C,Li J R,Liu S Z,et al.Effects of carburization on recrystallization behavior of a single crystal superalloy[J].Materials Characterization,2010,61(7):749-755.
[11]Zhang B,Liu C K,Lu X,et al.Effect of surface recrystallization on the creep rupture property of a single-crystal superalloy[J].Rare Metals,2010,29(4):413-416.
[12]黄朝晖,谭永宁,贾新云,等.第二代定向高温合金DZ406的长期时效研究[J].材料工程,2009(S1):105-109.Huang Zhaohui,Tan Yongning,Jia Xinyun,et al.Study on long-term aging of the second generation DS superalloy DZ406[J].Journal of Materials Engineering,2009(S1):105-109.
[13]宁礼奎,郑志,张达,等.DZ406合金及其渗铝涂层1100℃氧化性能研究[J].腐蚀科学与防护技术,2011,23(5):403-406.Ning Likui,Zheng Zhi,Zhang Da,et al.Oxidation behavior of DZ406alloy without and with aluminized coating at 1100℃[J].Corrosion Science and Protection Technology,2011,23(5):403-406.
[14]张仕朝,李莉,侯学勤.第二代定向柱晶高温合金低周疲劳行为研究[J].机械强度,2017,39(2):311-315.Zhang Shichao,Li Li,Hou Xueqin.Low-cycle fatigue of the second generation directionally solidified superalloy[J].Journal of Mechanical Strength,2017,39(2):311-315.
[15]时海芳,任鑫.材料力学性能[M].北京:北京大学出版社,2015:154.