High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels
High-cycle fatigue (HCF) behaviors of medium-carbon bainitic steels with various inclusion sizes and microstructural features were studied using the rotating–bending fatigue test. Here, the medium-carbon bainitic steels with different melting processes were treated by three heat treatment routes inc...
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MDPI AG
2022-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/5/856 |
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| author | Yusong Fan Xiaolu Gui Miao Liu Xi Wang Chun Feng Guhui Gao |
| author_facet | Yusong Fan Xiaolu Gui Miao Liu Xi Wang Chun Feng Guhui Gao |
| author_sort | Yusong Fan |
| collection | DOAJ |
| description | High-cycle fatigue (HCF) behaviors of medium-carbon bainitic steels with various inclusion sizes and microstructural features were studied using the rotating–bending fatigue test. Here, the medium-carbon bainitic steels with different melting processes were treated by three heat treatment routes incorporating bainite formation, namely bainite-based quenching plus partitioning (BQ&P), bainite austempering (BAT) and “disturbed bainite austempering, DBAT”. The interior inclusion-induced crack initiation (IICI) and noninclusion-induced crack initiation (NIICI) modes were found after fatigue failure. The fracture surface of IICI is characterized by a “fish-eye” surrounding a “fine granular area, FGA” in the vicinity of an inclusion. In contrast, a microfacet, instead of an inclusion, is found at the center of FGA for the NIICI fracture surface. The predications of fatigue strength and life were performed on the two crack initiation modes based on fracture surface analysis. The results showed that a majority of fatigue life is consumed within the FGA for both the IICI and NIICI failure modes. The fatigue strength of the NIICI-fatigued samples can be conveniently predicted via the two parameters of the hardness of the sample and the size of the microfacet. |
| first_indexed | 2024-03-10T03:25:04Z |
| format | Article |
| id | doaj.art-6c5ff5652b614d62b60fce23372e1f57 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:25:04Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-6c5ff5652b614d62b60fce23372e1f572023-11-23T12:10:27ZengMDPI AGMetals2075-47012022-05-0112585610.3390/met12050856High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic SteelsYusong Fan0Xiaolu Gui1Miao Liu2Xi Wang3Chun Feng4Guhui Gao5Material Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, ChinaMaterial Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, ChinaMaterial Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, ChinaMaterial Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, ChinaCNPC Tubular Goods Research Institute, Xi’an 710077, ChinaMaterial Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, ChinaHigh-cycle fatigue (HCF) behaviors of medium-carbon bainitic steels with various inclusion sizes and microstructural features were studied using the rotating–bending fatigue test. Here, the medium-carbon bainitic steels with different melting processes were treated by three heat treatment routes incorporating bainite formation, namely bainite-based quenching plus partitioning (BQ&P), bainite austempering (BAT) and “disturbed bainite austempering, DBAT”. The interior inclusion-induced crack initiation (IICI) and noninclusion-induced crack initiation (NIICI) modes were found after fatigue failure. The fracture surface of IICI is characterized by a “fish-eye” surrounding a “fine granular area, FGA” in the vicinity of an inclusion. In contrast, a microfacet, instead of an inclusion, is found at the center of FGA for the NIICI fracture surface. The predications of fatigue strength and life were performed on the two crack initiation modes based on fracture surface analysis. The results showed that a majority of fatigue life is consumed within the FGA for both the IICI and NIICI failure modes. The fatigue strength of the NIICI-fatigued samples can be conveniently predicted via the two parameters of the hardness of the sample and the size of the microfacet.https://www.mdpi.com/2075-4701/12/5/856bainitehigh-cycle fatiguefatigue crack initiationfatigue lifefatigue strength |
| spellingShingle | Yusong Fan Xiaolu Gui Miao Liu Xi Wang Chun Feng Guhui Gao High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels Metals bainite high-cycle fatigue fatigue crack initiation fatigue life fatigue strength |
| title | High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels |
| title_full | High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels |
| title_fullStr | High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels |
| title_full_unstemmed | High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels |
| title_short | High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels |
| title_sort | high cycle fatigue life and strength prediction for medium carbon bainitic steels |
| topic | bainite high-cycle fatigue fatigue crack initiation fatigue life fatigue strength |
| url | https://www.mdpi.com/2075-4701/12/5/856 |
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