Chao Jesus, Rementeria Rosalia, Aranda Maria, Capdevila Carlos, Gonzalez-Carrasco Jose Luis
Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda. Gregorio del Amo 8, Madrid 28040, Spain.
Materials (Basel). 2016 Jul 29;9(8):637. doi: 10.3390/ma9080637.
The ductile-to-brittle transition (DBT) behavior of two similar Fe-Cr-Al oxide dispersion strengthened (ODS) stainless steels was analyzed following the Cottrell-Petch model. Both alloys were manufactured by mechanical alloying (MA) but by different forming routes. One was manufactured as hot rolled tube, and the other in the form of hot extruded bar. The two hot forming routes considered do not significantly influence the microstructure, but cause differences in the texture and the distribution of oxide particles. These have little influence on tensile properties; however, the DBT temperature and the upper shelf energy (USE) are significantly affected because of delamination orientation with regard to the notch plane. Whereas in hot rolled material the delaminations are parallel to the rolling surface, in the hot extruded material, they are randomly oriented because the material is transversally isotropic.
按照科特雷尔-佩奇模型分析了两种相似的铁铬铝氧化物弥散强化（ODS）不锈钢的韧脆转变（DBT）行为。两种合金均通过机械合金化（MA）制备，但采用了不同的成型工艺。一种制成热轧管，另一种制成热挤压棒材。所考虑的两种热成型工艺对微观结构影响不大，但会导致织构和氧化物颗粒分布存在差异。这些对拉伸性能影响较小；然而，由于分层相对于缺口平面的取向，DBT温度和上平台能量（USE）受到显著影响。在热轧材料中，分层与轧制表面平行，而在热挤压材料中，由于材料横向各向同性，分层呈随机取向。
