Ferro Paolo, Bonollo Franco, Bassan Fabio, Berto Filippo
Department of Management and Engineering, University of Padua, I-36100 Vicenza, Italy.
Zoppelletto S.p.A., Via Camisana, I-36040 Vicenza, Italy.
Materials (Basel). 2017 Dec 18;10(12):1441. doi: 10.3390/ma10121441.
Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning Electron Microscopy (FEG-ESEM) has been used to evaluate the microstructural and local plastic strain evolution in different alloys (AISI 1005, AISI 304L and Duplex 2205) deformed by a single-stage cold and warm forging process. The present work is aimed to describe the different behavior of the austenite and ferrite during plastic deformation as a function of different forging temperatures. Several topological EBSD maps have been measured on the deformed and undeformed states. Then, image quality factor, distributions of the grain size and misorientation have been analyzed in detail. In the austenitic stainless steel, the γ-phase has been found to harden more easily, then α-phase and γ-phase in AISI 1005 and in duplex stainless steel, sequentially. Compared to the high fraction of continuous dynamic recrystallized austenitic zones observed in stainless steels samples forged at low temperatures, the austenitic microstructure of samples forged at higher temperatures, 600-700 °C, has been found to be mainly characterized by large and elongated grains with some colonies of fine nearly-equiaxed grains attributed to discontinuous dynamic recrystallization.
电子背散射衍射（EBSD）结合场发射环境扫描电子显微镜（FEG-ESEM）已被用于评估通过单级冷锻和温锻工艺变形的不同合金（AISI 1005、AISI 304L和双相2205）的微观结构和局部塑性应变演变。目前的工作旨在描述在不同锻造温度下，奥氏体和铁素体在塑性变形过程中的不同行为。已对变形和未变形状态测量了多个拓扑EBSD图。然后，详细分析了图像质量因子、晶粒尺寸分布和取向差。在奥氏体不锈钢中，发现γ相更容易硬化，然后是AISI 1005和双相不锈钢中的α相和γ相依次硬化。与在低温锻造的不锈钢样品中观察到的高比例连续动态再结晶奥氏体区相比，发现在600-700°C较高温度下锻造的样品的奥氏体微观结构主要特征是大的和拉长的晶粒，以及一些归因于不连续动态再结晶的细小近等轴晶粒的晶簇。
