Cargando…
Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment
The eutectic cast Al–Si alloys with excellent high-temperature and casting performance are widely used in engine pistons. During frequent starts and stops, the thermo-mechanical fatigue (TMF) is the most important failure cause. Ultrasonic melt treatment (UT) was chosen to compare and investigate th...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9607469/ https://www.ncbi.nlm.nih.gov/pubmed/36295191 http://dx.doi.org/10.3390/ma15207113 |
_version_ | 1784818552432230400 |
---|---|
author | Wang, Meng Pang, Jianchao Liu, Xinfeng Wang, Jianqiu Liu, Yongquan Li, Shouxin Zhang, Zhefeng |
author_facet | Wang, Meng Pang, Jianchao Liu, Xinfeng Wang, Jianqiu Liu, Yongquan Li, Shouxin Zhang, Zhefeng |
author_sort | Wang, Meng |
collection | PubMed |
description | The eutectic cast Al–Si alloys with excellent high-temperature and casting performance are widely used in engine pistons. During frequent starts and stops, the thermo-mechanical fatigue (TMF) is the most important failure cause. Ultrasonic melt treatment (UT) was chosen to compare and investigate the influence of micro-structures on fatigue life and damage mechanisms of as-cast (AC) eutectic Al–Si alloys under TMF loading. After UT, the grain size, primary Si, and intermetallic particles are reduced significantly in the alloy; fatigue life increases obviously. As a result of pilling-up of dislocations, the competitive effects of the critical strain/stress for fatigue crack nucleation can be found. There are two different crack initiation mechanisms under TMF: one is primary Si fracture for AC alloys with limited critical strain/stress for fatigue crack nucleation at fractured Si particles, and the other is primary Si debonding for UT alloys with increasing critical fracture strain/stress. After the crack initiation, the fractured or debonded primary phases provide the advantages for the further development of main cracks for both alloys. The UT alloy (805 ± 253 cycles) has about twice the TMF life of the AC alloy (403 ± 98 cycles). The refinement of micro-structures is instrumental in improving the fatigue resistance and life of TMF for the UT alloy. |
format | Online Article Text |
id | pubmed-9607469 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-96074692022-10-28 Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment Wang, Meng Pang, Jianchao Liu, Xinfeng Wang, Jianqiu Liu, Yongquan Li, Shouxin Zhang, Zhefeng Materials (Basel) Article The eutectic cast Al–Si alloys with excellent high-temperature and casting performance are widely used in engine pistons. During frequent starts and stops, the thermo-mechanical fatigue (TMF) is the most important failure cause. Ultrasonic melt treatment (UT) was chosen to compare and investigate the influence of micro-structures on fatigue life and damage mechanisms of as-cast (AC) eutectic Al–Si alloys under TMF loading. After UT, the grain size, primary Si, and intermetallic particles are reduced significantly in the alloy; fatigue life increases obviously. As a result of pilling-up of dislocations, the competitive effects of the critical strain/stress for fatigue crack nucleation can be found. There are two different crack initiation mechanisms under TMF: one is primary Si fracture for AC alloys with limited critical strain/stress for fatigue crack nucleation at fractured Si particles, and the other is primary Si debonding for UT alloys with increasing critical fracture strain/stress. After the crack initiation, the fractured or debonded primary phases provide the advantages for the further development of main cracks for both alloys. The UT alloy (805 ± 253 cycles) has about twice the TMF life of the AC alloy (403 ± 98 cycles). The refinement of micro-structures is instrumental in improving the fatigue resistance and life of TMF for the UT alloy. MDPI 2022-10-13 /pmc/articles/PMC9607469/ /pubmed/36295191 http://dx.doi.org/10.3390/ma15207113 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Meng Pang, Jianchao Liu, Xinfeng Wang, Jianqiu Liu, Yongquan Li, Shouxin Zhang, Zhefeng Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment |
title | Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment |
title_full | Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment |
title_fullStr | Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment |
title_full_unstemmed | Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment |
title_short | Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al–Si Alloy by the Ultrasonic Melt Treatment |
title_sort | optimization of thermo-mechanical fatigue life for eutectic al–si alloy by the ultrasonic melt treatment |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9607469/ https://www.ncbi.nlm.nih.gov/pubmed/36295191 http://dx.doi.org/10.3390/ma15207113 |
work_keys_str_mv | AT wangmeng optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment AT pangjianchao optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment AT liuxinfeng optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment AT wangjianqiu optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment AT liuyongquan optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment AT lishouxin optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment AT zhangzhefeng optimizationofthermomechanicalfatiguelifeforeutecticalsialloybytheultrasonicmelttreatment |