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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Effects of Cold Rolling and Strain-Induced Martensite Formation in a SAF 2205 Duplex Stainless Steel
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Effects of Cold Rolling and Strain-Induced Martensite Formation in a SAF 2205 Duplex Stainless Steel

机译：SAF 2205双相不锈钢冷轧和应变诱发马氏体形成的影响

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摘要

Duplex stainless steels (DSSs) are biphasic steels having a ferritic-austenitic microstructure that allows them to combine good mechanical and corrosion-resistance properties. However, these steels are sensitive to microstructural modifications, such as ferrite decomposition at high temperatures and the possibility of strain-induced martensite (SIM) formation from cold-worked austenite, which can significantly alter their interesting features. In the present work, the effects of cold rolling on the developed microstructural features in a cold-rolled SAF 2205 DSS and the onset of martensitic transformation are discussed. The material was deformed at room temperature from 3 to 85 pct thickness reduction, and several characterization techniques (scanning and transmission electron microscopy, X-ray diffraction, hardness measurements, and time-of-flight-neutron diffraction) were employed in order to fully describe the microstructural behavior of the steel. Despite the low stacking fault energy of DSS austenite, which contributed to SIM formation, the steel was found to be more stable than other stainless steel grades, such as AISI 304L. Rolling textures were similar to those pertaining to single-phase materials, but the presence of the biphasic (Duplex) microstructure imposed deformation constraints that affected the developed microstructural features, owing to phases interactions. Moreover, even if an intensification of the strain field in austenite was revealed, retarded SIM transformation kinetics and lower martensite amounts with respect to AISI 304L were observed.
机译：双相不锈钢（DSS）是具有铁素体-奥氏体微观结构的双相钢，可使其兼具良好的机械性能和耐腐蚀性能。但是，这些钢对微结构变化敏感，例如高温下的铁素体分解以及冷加工奥氏体形成应变诱发马氏体（SIM）的可能性，这可能会大大改变其有趣的特性。在当前的工作中，讨论了冷轧对冷轧SAF 2205 DSS中发达的显微组织特征的影响以及马氏体转变的开始。材料在室温下变形，厚度减少了3至85 pct，并采用了几种表征技术（扫描和透射电子显微镜，X射线衍射，硬度测量和飞行中子时间衍射）以完全描述钢的微观结构行为。尽管DSS奥氏体的堆垛层错能低，这有助于SIM的形成，但发现该钢比AISI 304L等其他不锈钢牌号更稳定。滚动织构类似于单相材料，但由于相的相互作用，双相（双相）微结构的存在施加了变形约束，从而影响了发达的微结构特征。而且，即使显示出奥氏体中的应变场的增强，相对于AISI 304L，也观察到SIM转变动力学被延迟并且马氏体量降低。

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