Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel
By means of microstructure observation and mechanical property tests, the effect of austempering temperature on the bainite transformation, carbide precipitation, and the hardness, impact toughness of M50 bearing steel were studied. Results show that when the austempering temperature increases from...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422014089 |
| _version_ | 1811253071447064576 |
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| author | Y. Su S. Yang X.F. Yu C.B. Zhou Y.B. Liu X.C. Feng Q. Zhao J.D. Wu |
| author_facet | Y. Su S. Yang X.F. Yu C.B. Zhou Y.B. Liu X.C. Feng Q. Zhao J.D. Wu |
| author_sort | Y. Su |
| collection | DOAJ |
| description | By means of microstructure observation and mechanical property tests, the effect of austempering temperature on the bainite transformation, carbide precipitation, and the hardness, impact toughness of M50 bearing steel were studied. Results show that when the austempering temperature increases from 180 °C, 200 °C, 220 °C, 240 °C to 260 °C, the bainite content in the microstructure of the steel is 3.5%, 11.9%, 15.4%, 22.1% and 36.1% respectively. The effect of austempering temperature on bainite content is mainly related to the incubation period of bainite transformation, the driving force of bainitic ferrite nucleation and the stability of supercooled austenite. With the increase of austempering temperature, the carbide content decreases but the average carbide size generally increases in the austempered and tempered steel. When the austempering temperature increases from 180 °C to 200 °C, the hardness of the sample decreases from 62.45 HRC to 62.04 HRC, and the impact toughness of the sample increases from 144.75 kJ/m2 to the maximum value of 171.50 kJ/m2 at 200 °C. When the austempering temperature increases from 200 °C to 260 °C, the hardness and impact toughness of the steel both decrease, which is related to the weakening of the dispersion strengthening caused by the increase of carbide size, and to the increase of bainite content, the increase of bainite size, and the self-inhibited behavior of bainite transformation. |
| first_indexed | 2024-04-12T16:44:20Z |
| format | Article |
| id | doaj.art-80f9eaa4255f4736aec7c9a2b5eb1d7c |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-12T16:44:20Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-80f9eaa4255f4736aec7c9a2b5eb1d7c2022-12-22T03:24:38ZengElsevierJournal of Materials Research and Technology2238-78542022-09-012045764584Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing SteelY. Su0S. Yang1X.F. Yu2C.B. Zhou3Y.B. Liu4X.C. Feng5Q. Zhao6J.D. Wu7School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, ChinaSchool of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, ChinaSchool of Mechanical Engineering, Shenyang University of Technology, Shenyang, 110870, China; Corresponding author.School of Mechanical Engineering, Shenyang University of Technology, Shenyang, 110870, ChinaAECC Harbin Bearing Co., Ltd., Harbin, 150500, ChinaAECC Harbin Bearing Co., Ltd., Harbin, 150500, ChinaAECC Harbin Bearing Co., Ltd., Harbin, 150500, ChinaSchool of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, ChinaBy means of microstructure observation and mechanical property tests, the effect of austempering temperature on the bainite transformation, carbide precipitation, and the hardness, impact toughness of M50 bearing steel were studied. Results show that when the austempering temperature increases from 180 °C, 200 °C, 220 °C, 240 °C to 260 °C, the bainite content in the microstructure of the steel is 3.5%, 11.9%, 15.4%, 22.1% and 36.1% respectively. The effect of austempering temperature on bainite content is mainly related to the incubation period of bainite transformation, the driving force of bainitic ferrite nucleation and the stability of supercooled austenite. With the increase of austempering temperature, the carbide content decreases but the average carbide size generally increases in the austempered and tempered steel. When the austempering temperature increases from 180 °C to 200 °C, the hardness of the sample decreases from 62.45 HRC to 62.04 HRC, and the impact toughness of the sample increases from 144.75 kJ/m2 to the maximum value of 171.50 kJ/m2 at 200 °C. When the austempering temperature increases from 200 °C to 260 °C, the hardness and impact toughness of the steel both decrease, which is related to the weakening of the dispersion strengthening caused by the increase of carbide size, and to the increase of bainite content, the increase of bainite size, and the self-inhibited behavior of bainite transformation.http://www.sciencedirect.com/science/article/pii/S2238785422014089M50 steelAustempering treatmentBainiteCarbideHardnessImpact toughness |
| spellingShingle | Y. Su S. Yang X.F. Yu C.B. Zhou Y.B. Liu X.C. Feng Q. Zhao J.D. Wu Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel Journal of Materials Research and Technology M50 steel Austempering treatment Bainite Carbide Hardness Impact toughness |
| title | Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel |
| title_full | Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel |
| title_fullStr | Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel |
| title_full_unstemmed | Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel |
| title_short | Effect of Austempering Temperature on Microstructure and Mechanical Properties of M50 Bearing Steel |
| title_sort | effect of austempering temperature on microstructure and mechanical properties of m50 bearing steel |
| topic | M50 steel Austempering treatment Bainite Carbide Hardness Impact toughness |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422014089 |
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