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Microstructure dependence of impact toughness in duplex stainless steels

机译：双相不锈钢冲击韧性的微观结构依赖性

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摘要

In this study, the microstructure dependence of impact toughness was studied for a 2205 duplex stainless steel in the temperature range of -196 to 25 degrees C. Three markedly different austenite morphologies (i.e., rolled (R), equiaxed (E) and Widmanstatten (W)) were produced through different thermomechanical routes. It was found that while the room temperature impact toughness of all microstructures were quite similar, the microstructure dependence of impact toughness significantly increased with decreasing testing temperature. At cryogenic temperatures, microstructure R showed significantly higher toughness compared to microstructures E and W. Considering a 40 J criterion, the ductile to brittle transition temperature was estimated to be similar to - 80 degrees C for microstructures W and E, while microstructure R showed impact toughness values higher than 40 J even at - 196 degrees C. The lamellar character of microstructure R and the termination of ferrite phase on the (100) plane orientation in this microstructure were found to have a positive effect on the toughness. The occurrence of deformation twinning within ferrite at low temperatures, facilitated by significantly coarser grain sizes in microstructures E and W compared to R, appeared to be the main reason behind the observed deterioration of the impact toughness of the former microstructures at these temperatures.
机译：在这项研究中，研究了在-196至25摄氏度的温度范围内2205双相不锈钢的冲击韧性的微观结构依赖性。三种明显不同的奥氏体形态（即轧制（R），等轴（E）和Widmanstatten（ W））是通过不同的热机械路线生产的。结果发现，尽管所有微观结构的室温冲击韧性都非常相似，但是随着测试温度的降低，冲击韧性对微观结构的依赖性显着增加。在低温下，与微观结构E和W相比，微观结构R表现出明显更高的韧性。考虑到40 J准则，对于微观结构W和E，韧性至脆性转变温度估计约为-80℃，而微观结构R则显示出冲击甚至在-196摄氏度时，韧性值也高于40J。发现微观结构R的层状特征和在该微观结构中（100）平面取向上的铁素体相终止对韧性有积极影响。微观结构E和W的晶粒尺寸明显大于R，这导致低温下铁素体内部发生孪晶变形似乎是观察到的在这些温度下以前的微观结构的冲击韧性下降的主要原因。

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