{"title":"Role of retained austenite in advanced high-strength steel: ductility and toughness","authors":"Vung Lam Nuam, Hao Zhang, Ying-chun Wang, Zhi-ping Xiong","doi":"10.1007/s42243-023-01165-3","DOIUrl":null,"url":null,"abstract":"<p>Enhancing the ductility and toughness of advanced high-strength steels is essential for the wide range of promising applications. The retained austenite (RA) is a key phase due to the austenite-to-martensite transformation and its transformation-induced plasticity effect. It is commonly accepted that slow RA-to-martensite transformation is beneficial to ductility; therefore, the RA fraction and stability should be carefully controlled. The RA stability is related to its morphology, size, carbon content, neighboring phase and orientation. Importantly, these factors are cross-influenced. It is noteworthy that the influence of RA on ductility and fracture toughness is not consistent because of their difference in stress state. There is no clear relationship between fracture toughness and tensile properties. Thus, it is important to understand the role of RA in toughness. The toughness is enhanced during the RA-to-martensite transformation, while the fracture toughness is decreased due to the formation of fresh and brittle martensite. As a result, the findings regarding to the effect of RA on fracture toughness are conflicting. Further investigations should be conducted in order to fully understand the effects of RA on ductility and fracture toughness, which can optimize the combination of ductility and toughness in AHSSs.</p>","PeriodicalId":16151,"journal":{"name":"Journal of Iron and Steel Research International","volume":null,"pages":null},"PeriodicalIF":2.5000,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Iron and Steel Research International","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s42243-023-01165-3","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Enhancing the ductility and toughness of advanced high-strength steels is essential for the wide range of promising applications. The retained austenite (RA) is a key phase due to the austenite-to-martensite transformation and its transformation-induced plasticity effect. It is commonly accepted that slow RA-to-martensite transformation is beneficial to ductility; therefore, the RA fraction and stability should be carefully controlled. The RA stability is related to its morphology, size, carbon content, neighboring phase and orientation. Importantly, these factors are cross-influenced. It is noteworthy that the influence of RA on ductility and fracture toughness is not consistent because of their difference in stress state. There is no clear relationship between fracture toughness and tensile properties. Thus, it is important to understand the role of RA in toughness. The toughness is enhanced during the RA-to-martensite transformation, while the fracture toughness is decreased due to the formation of fresh and brittle martensite. As a result, the findings regarding to the effect of RA on fracture toughness are conflicting. Further investigations should be conducted in order to fully understand the effects of RA on ductility and fracture toughness, which can optimize the combination of ductility and toughness in AHSSs.
提高先进高强度钢的延展性和韧性对于广泛的应用前景至关重要。由于奥氏体向马氏体的转变及其转变引起的塑性效应,残余奥氏体(RA)是一个关键相。人们普遍认为,RA 向马氏体的缓慢转变有利于延展性;因此,应仔细控制 RA 的比例和稳定性。RA 的稳定性与其形态、尺寸、碳含量、相邻相和取向有关。重要的是,这些因素相互影响。值得注意的是,由于应力状态不同,RA 对延展性和断裂韧性的影响并不一致。断裂韧性与拉伸性能之间没有明确的关系。因此,了解 RA 对韧性的作用非常重要。在 RA 向马氏体转变的过程中,韧性会增强,而由于新鲜脆性马氏体的形成,断裂韧性会降低。因此,有关 RA 对断裂韧性影响的研究结果相互矛盾。为了充分了解 RA 对延展性和断裂韧性的影响,从而优化 AHSS 中延展性和韧性的结合,应开展进一步的研究。
期刊介绍:
Publishes critically reviewed original research of archival significance
Covers hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, physical chemistry, solidification, mechanical working, solid state reactions, materials processing, and more
Includes welding & joining, surface treatment, mathematical modeling, corrosion, wear and abrasion
Journal of Iron and Steel Research International publishes original papers and occasional invited reviews on aspects of research and technology in the process metallurgy and metallic materials. Coverage emphasizes the relationships among the processing, structure and properties of metals, including advanced steel materials, superalloy, intermetallics, metallic functional materials, powder metallurgy, structural titanium alloy, composite steel materials, high entropy alloy, amorphous alloys, metallic nanomaterials, etc..