Production, microstructure and mechanical properties of two different austenitic ODS steels
Production, microstructure and mechanical properties of two different austenitic ODS steels
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DOI：
10.1016/j.jnucmat.2017.02.034
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发表时间：
2017-04
影响因子：
3.1
通讯作者：
T. Gräning;M. Rieth;J. Hoffmann;A. Möslang
中科院分区：
文献类型：
--
作者：
T. Gräning;M. Rieth;J. Hoffmann;A. Möslang
本文总结并研究了新型开发的奥氏体氧化物分散强化（ODS）钢的工艺参数。在退火前后相同程度的变形后比较热轧和挤压条件，只是一些例子，可以深入了解奥氏体ODS钢的复杂加工。该材料的主要缺点之一是生产过程更加复杂。由于韧性基体材料在研磨过程中具有增加的粘性，因此应用了使用ZrO2研磨球的两步研磨程序以提高生产产率，并使用ZrO2的磨损作为附加元素以促进纳米尺寸的沉淀物的形成。为了更好地理解研磨后不同的粉末粒度如何影响最终性能，进行了筛分，并揭示了在沉淀物尺寸、分布和机械性能方面的严重影响。晶粒尺寸的沉淀物的大小，退火时间和工艺参数进行了测定和比较的机械性能。硬度和拉伸试验表明，析出相的尺寸和数量对抗拉强度的影响比晶粒尺寸更大，热轧材料具有更好的性能。显微组织的研究表明，在1100 °C退火40 h后，析出相稳定。这些热处理也导致一致的晶粒尺寸，由于钉扎效应的晶界，由沉淀物引起的。
This article is to summarize and examine processing parameters of novel developed austenitic oxide dispersed strengthened (ODS) steels. Comparing hot-rolled and extruded conditions after the same degree of deformation after and before annealing, are just some examples to give insights into the complex processing of austenitic ODS steels. One of the major drawbacks of the material is the more sophisticated production process. Due to a ductile matrix material with an increased stickiness during milling, a two-step milling procedure with the use of ZrO2milling balls was applied to raise the production yield and to use the abrasion of the ZrO2as an additional element to facilitate the formation of nano-sized precipitates. To get a better understanding how the different powder particle sizes after milling affect final properties, sieving was applied and revealed a serious effect in terms of precipitate size, distribution and mechanical properties. Grain sizes in relation to the precipitate size, annealing time and processing parameters were determined and compared to the mechanical properties. Hardness and tensile test have pointed out, that the precipitate size and number are more important in respect to the ultimate tensile strength than the grain size and that in this study hot-rolled material exhibited the better properties. The investigation of the microstructure illustrated the stability of precipitates during annealing at 1100 °C for 40 h. These heat treatments also led to a consistent grain size, due to the pinning effect of the grain boundaries, caused by precipitates.