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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：BN-350辐照的12Cr18Ni10Ti不锈钢在“形变波”演变过程中观察到的延展性异常增强

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摘要

Whereas most previous irradiation studies conducted at lower neutron exposures in the range 100-400℃ 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℃ 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, dσ/dε(ε). The increase in strain hardening is thought to arise from an irradiation-induced increase in the propensity of the γ→α martensitic transformation.
机译：尽管先前大多数在较低中子暴露于100-400℃范围内进行的辐照研究始终能增强不锈钢的强度并显着降低其延展性，但现在看来，较高的辐照量可能会导致某些钢的延展性损失逆转。在以26和55 dpa辐照的12Cr18Ni10Ti不锈钢中，观察到了一种新的辐射诱发现象。它涉及在20和60°C的“塑性变形的移动波”，产生“异常”的高工程延展性值，特别是与在较低中子暴露下发生的变形相比。由于在波前发生集中变形，因此波的移动速度远快于机械施加的应变率。但是，在120℃应变时，未观察到移动波，表明该现象在较低的测试温度下起作用。使用数字光学引伸计技术，获得了“真实应力-真实应变”曲线。似乎由于应变硬化率dσ/dε（ε）的增加而发生塑性变形的移动波。认为应变硬化的增加是由γ→α马氏体相变的倾向引起的辐射引起的。

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