Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃
Unstressed exposure tests of Inconel 740H alloy tube were carried out at 750℃ for 500-3000h. The microstructure evolution and microhardness were studied by means of thermodynamic simulation, OM, FEG-SEM and microhardness testing. The results show that the tube is qualified if both chemical compositi...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2016-09-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.009 |
| _version_ | 1797966255705030656 |
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| author | DANG Ying-ying ZHAO Xin-bao YIN Hong-fei LU Jin-tao YUAN Yong YANG Zhen GU Yue-feng |
| author_facet | DANG Ying-ying ZHAO Xin-bao YIN Hong-fei LU Jin-tao YUAN Yong YANG Zhen GU Yue-feng |
| author_sort | DANG Ying-ying |
| collection | DOAJ |
| description | Unstressed exposure tests of Inconel 740H alloy tube were carried out at 750℃ for 500-3000h. The microstructure evolution and microhardness were studied by means of thermodynamic simulation, OM, FEG-SEM and microhardness testing. The results show that the tube is qualified if both chemical composition and tensile properties of the as-received alloy meet the corresponding requirements of ASME. After long term exposure, the main precipitates are <i>γ</i>' and <i>M</i><sub>23</sub>C<sub>6</sub>, and no <i>η</i> and <i>σ</i> phase. With the prolonging of exposure time, the coarsening of <i>γ</i>' becomes faster and the law of relationship between the radius of <i>γ</i>' and time accords with LSW Ostwald ripening law; meanwhile, the change in size of <i>M</i><sub>23</sub>C<sub>6</sub> is not so obvious. During the whole process, microhardness increases firstly and then decreases, but the fluctuation is slight. The changes of microstructure and hardness indicate that, after long time exposure, the domestic Inconel 740H has good stability and can be used for further carrying out the investigation on the mechanical property of creep-rupture. |
| first_indexed | 2024-04-11T02:12:52Z |
| format | Article |
| id | doaj.art-6af8354e87754184a2efd297667c77a1 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T02:12:52Z |
| publishDate | 2016-09-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-6af8354e87754184a2efd297667c77a12023-01-03T01:48:59ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812016-09-01449586210.11868/j.issn.1001-4381.2016.09.00920160909Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃DANG Ying-ying0ZHAO Xin-bao1YIN Hong-fei2LU Jin-tao3YUAN Yong4YANG Zhen5GU Yue-feng6Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaXi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaXi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaXi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaXi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaXi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaXi'an Thermal Power Research Institute Co., Ltd., Xi'an 710032, ChinaUnstressed exposure tests of Inconel 740H alloy tube were carried out at 750℃ for 500-3000h. The microstructure evolution and microhardness were studied by means of thermodynamic simulation, OM, FEG-SEM and microhardness testing. The results show that the tube is qualified if both chemical composition and tensile properties of the as-received alloy meet the corresponding requirements of ASME. After long term exposure, the main precipitates are <i>γ</i>' and <i>M</i><sub>23</sub>C<sub>6</sub>, and no <i>η</i> and <i>σ</i> phase. With the prolonging of exposure time, the coarsening of <i>γ</i>' becomes faster and the law of relationship between the radius of <i>γ</i>' and time accords with LSW Ostwald ripening law; meanwhile, the change in size of <i>M</i><sub>23</sub>C<sub>6</sub> is not so obvious. During the whole process, microhardness increases firstly and then decreases, but the fluctuation is slight. The changes of microstructure and hardness indicate that, after long time exposure, the domestic Inconel 740H has good stability and can be used for further carrying out the investigation on the mechanical property of creep-rupture.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.009Inconel 740Hlong term exposuremicrostructure stabilitymicrohardness |
| spellingShingle | DANG Ying-ying ZHAO Xin-bao YIN Hong-fei LU Jin-tao YUAN Yong YANG Zhen GU Yue-feng Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃ Cailiao gongcheng Inconel 740H long term exposure microstructure stability microhardness |
| title | Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃ |
| title_full | Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃ |
| title_fullStr | Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃ |
| title_full_unstemmed | Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃ |
| title_short | Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃ |
| title_sort | microstructure stability of inconel 740h alloy after long term exposure at 750℃ |
| topic | Inconel 740H long term exposure microstructure stability microhardness |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.009 |
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