Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars
In the present research, the orthogonal experiment was carried out to investigate the influence of different austempering process parameters (i.e. austenitizing temperature and time, and austempering temperature and time) on microstructure and mechanical properties of LZQT500-7 ductile iron dense ba...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Foundry Journal Agency
2015-03-01
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| Series: | China Foundry |
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| Online Access: | http://ff.foundryworld.com/uploadfile/2015042055733849.pdf |
| _version_ | 1818549930191486976 |
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| author | Chun-jie Xu Pan Dai Zheng-yang Zhang |
| author_facet | Chun-jie Xu Pan Dai Zheng-yang Zhang |
| author_sort | Chun-jie Xu |
| collection | DOAJ |
| description | In the present research, the orthogonal experiment was carried out to investigate the influence of different austempering process parameters (i.e. austenitizing temperature and time, and austempering temperature and time) on microstructure and mechanical properties of LZQT500-7 ductile iron dense bars with 172 mm in diameter which were produced by horizontal continuous casting (HCC). The results show that the major factors influencing the hardness of austempered ductile iron (ADI) are austenitizing temperature and austempering temperature. The fraction of retained austenite increases as the austenitizing and austempering temperatures increase. When austenitizing temperature is low, acicular ferrite and retained austenite can be efficiently obtained by appropriately extending the austenitizing time. The proper austmepering time could ensure enough stability of retained austenite and prevent high carbon austenite decomposition. The optimal mechanical properties of ADI can be achieved with the following process parameters: austenitizing temperature and time are 866 °C and 135 min, and austempering temperature and time are 279 °C and 135 min, respectively. The microstructure of ADI under the optimal austempering process consists of fine acicular ferrite and a small amount of retained austenite, and the hardness, tensile strength, yield strength, elongation and impact toughness of the bars are HBW 476, 1670 MPa, 1428 MPa, 2.93% and 25.7 J, respectively. |
| first_indexed | 2024-12-12T08:39:41Z |
| format | Article |
| id | doaj.art-5bc9d208776f457d93fe2ea020703ec7 |
| institution | Directory Open Access Journal |
| issn | 1672-6421 1672-6421 |
| language | English |
| last_indexed | 2024-12-12T08:39:41Z |
| publishDate | 2015-03-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-5bc9d208776f457d93fe2ea020703ec72022-12-22T00:30:49ZengFoundry Journal AgencyChina Foundry1672-64211672-64212015-03-01122104110Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense barsChun-jie Xu0Pan Dai1Zheng-yang Zhang2School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaIn the present research, the orthogonal experiment was carried out to investigate the influence of different austempering process parameters (i.e. austenitizing temperature and time, and austempering temperature and time) on microstructure and mechanical properties of LZQT500-7 ductile iron dense bars with 172 mm in diameter which were produced by horizontal continuous casting (HCC). The results show that the major factors influencing the hardness of austempered ductile iron (ADI) are austenitizing temperature and austempering temperature. The fraction of retained austenite increases as the austenitizing and austempering temperatures increase. When austenitizing temperature is low, acicular ferrite and retained austenite can be efficiently obtained by appropriately extending the austenitizing time. The proper austmepering time could ensure enough stability of retained austenite and prevent high carbon austenite decomposition. The optimal mechanical properties of ADI can be achieved with the following process parameters: austenitizing temperature and time are 866 °C and 135 min, and austempering temperature and time are 279 °C and 135 min, respectively. The microstructure of ADI under the optimal austempering process consists of fine acicular ferrite and a small amount of retained austenite, and the hardness, tensile strength, yield strength, elongation and impact toughness of the bars are HBW 476, 1670 MPa, 1428 MPa, 2.93% and 25.7 J, respectively.http://ff.foundryworld.com/uploadfile/2015042055733849.pdfhorizontal continuous casting (HCC); ductile iron dense bars; austempered ductile iron (ADI); microstructure and mechanical properties; orthogonal test |
| spellingShingle | Chun-jie Xu Pan Dai Zheng-yang Zhang Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars China Foundry horizontal continuous casting (HCC); ductile iron dense bars; austempered ductile iron (ADI); microstructure and mechanical properties; orthogonal test |
| title | Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars |
| title_full | Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars |
| title_fullStr | Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars |
| title_full_unstemmed | Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars |
| title_short | Effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars |
| title_sort | effect of austempering parameters on microstructure and mechanical properties of horizontal continuous casting ductile iron dense bars |
| topic | horizontal continuous casting (HCC); ductile iron dense bars; austempered ductile iron (ADI); microstructure and mechanical properties; orthogonal test |
| url | http://ff.foundryworld.com/uploadfile/2015042055733849.pdf |
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