{"title":"Microstructure evolution and mechanical properties of cold rolled Ti–Mo precipitation-hardened stainless steels after ageing treatment","authors":"Yu-Shan Chang, Chih-Yuan Chen","doi":"10.1016/j.jmrt.2025.06.041","DOIUrl":null,"url":null,"abstract":"<div><div>While cold deformation prior to aging is a well-established approach for enhancing the mechanical properties of precipitation-hardened stainless steels (PHSSs), the synergistic effect of cold deformation and aging on microstructural evolution remains insufficiently explored. To investigate this effect, different levels (35 % and 70 %) of cold deformation strain (CDS) were applied, followed by aging at low (520 °C) and high (640 °C) temperatures, leading to variations in the formation of reverted austenite within the Ti–Mo PHSS. Regardless of the CDS, reverted austenite was observed only when aging was performed at 640 °C, while no significant austenite reversion occurred at 520 °C. Therefore, only aging was conducted at 640 °C, the trade-off relationship between strength and ductility improved with increasing CDS. This improvement was primarily due to the simultaneous formation of a higher density of η-Ni<sub>3</sub>Ti precipitates and reverted austenite during aging. These results indicate that optimizing metallurgical parameters can further enhance the mechanical performance of Ti–Mo PHSS, particularly by leveraging the effects of cold deformation strain and aging temperature on austenite reversion and precipitation behavior.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"37 ","pages":"Pages 1134-1150"},"PeriodicalIF":6.2000,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Research and Technology-Jmr&t","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2238785425014632","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
While cold deformation prior to aging is a well-established approach for enhancing the mechanical properties of precipitation-hardened stainless steels (PHSSs), the synergistic effect of cold deformation and aging on microstructural evolution remains insufficiently explored. To investigate this effect, different levels (35 % and 70 %) of cold deformation strain (CDS) were applied, followed by aging at low (520 °C) and high (640 °C) temperatures, leading to variations in the formation of reverted austenite within the Ti–Mo PHSS. Regardless of the CDS, reverted austenite was observed only when aging was performed at 640 °C, while no significant austenite reversion occurred at 520 °C. Therefore, only aging was conducted at 640 °C, the trade-off relationship between strength and ductility improved with increasing CDS. This improvement was primarily due to the simultaneous formation of a higher density of η-Ni3Ti precipitates and reverted austenite during aging. These results indicate that optimizing metallurgical parameters can further enhance the mechanical performance of Ti–Mo PHSS, particularly by leveraging the effects of cold deformation strain and aging temperature on austenite reversion and precipitation behavior.
期刊介绍:
The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.