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Tensile deformation and fracture properties of a 14YWT nanostructured ferritic alloy

机译:14YWT纳米铁素体合金的拉伸变形和断裂性能

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A new larger heat of a 14YWT nanostructured ferritic alloy (NFA), FCRD NFA-1, was synthesized by ball milling FeO and argon atomized Fe-14Cr-3W-0.4Ti-0.2Y (wt%) powders, followed by hot extrusion, annealing and cross rolling to produce an ≈10 mm-thick plate. NFA-1 contains a bimodal size distribution of pancake-shaped, mostly very fine scale, grains. The as-processed plate also contains a large population of microcracks running parallel to its broad surfaces. The small grains and large concentration of Y-Ti-O nano-oxides (NOs) result in high strength up to 800℃. The uniform and total elongations range from ≈1-8%, and ≈10-24%, respectively. The strength decreases more rapidly above ≈400℃ and deformation transitions to largely viscoplastic creep by ≈600℃. While the local fracture mechanism is generally ductile-dimple microvoid nucleation, growth and coalescence, perhaps the most notable feature of tensile deformation behavior of NFA-1 is the occurrence of periodic delamination, manifested as fissures on the fracture surfaces.
机译:通过球磨FeO和氩雾化的Fe-14Cr-3W-0.4Ti-0.2Y(wt%)粉末,然后进行热挤压,合成了14YWT纳米铁素体合金(NFA)FCRD NFA-1。退火和交叉轧制以生产厚度约10毫米的钢板。 NFA-1包含双峰大小分布,呈煎饼状(大多为极细尺度)的谷物。加工后的板还包含大量平行于其宽表面延伸的微裂纹。 Y-Ti-O纳米氧化物(NOs)的小晶粒和高浓度导致高达800℃的高强度。均匀伸长率和总伸长率分别为≈1-8%和≈10-24%。强度在≈400℃以上下降得更快,在≈600℃时变形开始转变为大部分粘塑性蠕变。虽然局部断裂机制通常是韧性凹痕微孔形核,生长和聚结,但NFA-1拉伸变形行为的最显着特征可能是周期性分层的出现,表现为断裂表面的裂缝。

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