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首页> 外文会议>Effects of radiation on nuclear materials and the nuclear fuel cycle >Unusual Enhancement of Ductility Observed During Evolution of a 'Deformation Wave' in 12Cr18Ni10Ti Stainless Steel Irradiated in BN-350
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Unusual Enhancement of Ductility Observed During Evolution of a 'Deformation Wave' in 12Cr18Ni10Ti Stainless Steel Irradiated in BN-350

机译：在BN-350照射的12Cr18Ni10TI不锈钢中的“变形波”中观察到的延展性的不寻常增强

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Whereas most previous irradiation studies conducted at lower neutron exposures in the range 100-400°C have consistently produced strengthening and strongly reduced ductility in stainless steels, it now appears possible that higher exposures may lead to a reversal in ductility loss for some steels. A new radiation-induced phenomenon has been observed in 12Cr18Ni10Ti stainless steel irradiated to 26 and 55 dpa. It involves "a moving wave of plastic deformation" at 20 and 60°C that produces "anomalously" high values of engineering ductility, especially when compared to deformation occurring at lower neutron exposures. Due to the concentrated deformation occurring at the wave front, the wave moves much faster than the mechanically applied strain rate. However, when strained at 120°C the moving wave is not observed, indicating that the phenomenon operates at lower test temperatures. Using the technique of digital optical extensometry, the "true stress-true strain" curves were obtained. It appears that the moving wave of plastic deformation occurs as a result of an increase in the strain hardening rate, da/de(s). The increase in strain hardening is thought to arise from an irradiation-induced increase in the propensity of the y->a martensitic transformation.
机译：然而，在100-400℃的较低中子曝光中进行的大多数先前的照射研究在100-400℃的范围内，在不锈钢中一致地产生强化和强烈降低的延展性，现在似乎可能导致一些钢的延展性损失中的逆转。在12Cr18Ni10TI不锈钢中观察到新的辐射诱导的现象，其照射到26和55dPa。它涉及在20和60°C的“塑性变形的移动波”，其产生“异常”的工程延展性高值，特别是与在较低中子曝光时发生的变形相比。由于在波前发生的浓缩变形，波浪移动比机械施加的应变率快得多。然而，当在120℃下应变时，未观察到运动波，表明现象在较低的测试温度下运行。使用数字光学突出学技术，获得了“真正的应力真菌”曲线。看来，塑性变形的移动波是由于应变硬化率，DA / de的增加而发生。认为应变硬化的增加来自辐射诱导的Y-> A-> A Martensitacation倾向的增加。

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