The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy
The effects of Hafnium on the microstructure and tensile property of a Ni-based superalloy after solution heat treatment and long-term thermal exposure were investigated with field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD). The...
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Elsevier
2024-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424008238 |
| _version_ | 1797210038876504064 |
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| author | Linzi Li Yunsheng Wu Jieshan Hou Shuang Gao Lanzhang Zhou |
| author_facet | Linzi Li Yunsheng Wu Jieshan Hou Shuang Gao Lanzhang Zhou |
| author_sort | Linzi Li |
| collection | DOAJ |
| description | The effects of Hafnium on the microstructure and tensile property of a Ni-based superalloy after solution heat treatment and long-term thermal exposure were investigated with field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD). The results revealed reveal that Hf intensified intensifies the element segregation and promoted promotes the precipitation of MC carbide and honeycomb-like Ni5Hf phase in the as-cast alloy. The solid solution strengthening and second phase (MC) strengthening effects are both enhanced in the alloy doping 0.5 wt% Hf after solution heat treatment. Therefore, the tensile yield strength at 700 °C of the alloy with 0.5 wt% Hf is higher than that in the Hf-free alloy. Otherwise, a large amount of the low melting point Ni5Hf phases appear in the alloy with 0.8 wt% Hf. Ni5Hf phase is prone to become the crack initiation, which decreases diminishes the yield strength in the alloy with 0.8 wt% Hf. The addition of 0.5 wt% Hf can inhibit the formation of needle-like δ phase at grain boundary due to the decrease of grain boundary energy and diffusion rate at grain boundary. Therefore, the 700 °C tensile strength and ductility increase simultaneously in the alloy with 0.5 wt% Hf after thermal exposure at 700 °C. |
| first_indexed | 2024-04-24T10:04:15Z |
| format | Article |
| id | doaj.art-7a1dd8294b5d479886ce3c1b36c7da0b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T10:04:15Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-7a1dd8294b5d479886ce3c1b36c7da0b2024-04-13T04:21:22ZengElsevierJournal of Materials Research and Technology2238-78542024-05-013029772985The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloyLinzi Li0Yunsheng Wu1Jieshan Hou2Shuang Gao3Lanzhang Zhou4Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Corresponding author. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China.School of Material Engineering, Shanghai University of Engineering Science, Shanghai, 201620, ChinaShi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; Corresponding author. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China.The effects of Hafnium on the microstructure and tensile property of a Ni-based superalloy after solution heat treatment and long-term thermal exposure were investigated with field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD). The results revealed reveal that Hf intensified intensifies the element segregation and promoted promotes the precipitation of MC carbide and honeycomb-like Ni5Hf phase in the as-cast alloy. The solid solution strengthening and second phase (MC) strengthening effects are both enhanced in the alloy doping 0.5 wt% Hf after solution heat treatment. Therefore, the tensile yield strength at 700 °C of the alloy with 0.5 wt% Hf is higher than that in the Hf-free alloy. Otherwise, a large amount of the low melting point Ni5Hf phases appear in the alloy with 0.8 wt% Hf. Ni5Hf phase is prone to become the crack initiation, which decreases diminishes the yield strength in the alloy with 0.8 wt% Hf. The addition of 0.5 wt% Hf can inhibit the formation of needle-like δ phase at grain boundary due to the decrease of grain boundary energy and diffusion rate at grain boundary. Therefore, the 700 °C tensile strength and ductility increase simultaneously in the alloy with 0.5 wt% Hf after thermal exposure at 700 °C.http://www.sciencedirect.com/science/article/pii/S2238785424008238HafniumNi-based superalloyTensile strengthδ phaseMicrostructure |
| spellingShingle | Linzi Li Yunsheng Wu Jieshan Hou Shuang Gao Lanzhang Zhou The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy Journal of Materials Research and Technology Hafnium Ni-based superalloy Tensile strength δ phase Microstructure |
| title | The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy |
| title_full | The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy |
| title_fullStr | The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy |
| title_full_unstemmed | The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy |
| title_short | The effect of Hafnium on the microstructure and tensile property in a Ni-based superalloy |
| title_sort | effect of hafnium on the microstructure and tensile property in a ni based superalloy |
| topic | Hafnium Ni-based superalloy Tensile strength δ phase Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424008238 |
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