Hot Deformation Behavior of a New Nuclear Use Reduced Activation Ferritic/Martensitic Steel

The hot deformation behavior and workability of a new reduced activation ferritic/martensitic steel named SIMP steel for accelerator-driven system were studied.The flow curve and its microstructure were studied at 900-1200℃ and strain rate range of 0.001-10 s~(-1).The results showed that the deformation behavior of the SIMP steel during hot compression could be manifested by the Zener-Hollomon parameter in an exponent-type equation.Based on the obtained constitutive equation,the calculated flow stresses were in agreement with the experimentally measured ones,and the average activity energies QDRV and QHW for the initiation of dynamic recrystallization and the peak strain were calculated to be 476.1 kJ/mol and 462.7 kJ/mol,respectively.Furthermore,based on the processing maps and microstructure evolution,the optimum processing condition for the SIMP steel was determined to be 1050-1200 ℃/0.001-0.1 s~(-1).     

MOO—MicroJIAC agents operating oxen

The MicroJIAC team has participated in the Multi-Agent Programming Contest 2007 with some success. This year, we attended again. Our contest contribution was implemented by a student during a university course using the current version of our agent framework. Unlike the gold mining scenario of MAPC 2007, this year’s cow herding scenario had higher complexity and was a very good testbed to evaluate our new agent framework.     

Enhancing water flux through semipermeable polybenzimidazole membranes by adding surfactant‐treated CNTs

In this study, surfactant‐treated carbon nanotubes (CNTs) were incorporated into polybenzimidazole (PBI) matrix to prepare the PBI/CNT composite membranes with CNT content in the range of 0 to 15 wt %. The composite membranes were fabricated by spin‐coating. The membrane morphology, mechanical property, and water and salt transport properties were investigated to characterize the additive effect of CNTs. The tensile strength of all the PBI/CNT composite membranes was lower than that of pristine PBI membrane, indicating the weak interaction between CNT and PBI. In addition, water flux increased without reducing the salt rejection when CNTs were homogeneously dispersed in the PBI matrix at a less than 7.5 wt % content. On the other hand, at 10 wt % and higher CNT content, submicro‐scaled cellular structure was formed, and both the water flux and salt rejection decreased. The well‐dispersed CNTs in the PBI matrix via weak interaction preferentially improve the water permeability by 1.7 times without depressing the salt rejection. The incorporation of well‐dispersed CNTs in polymer matrix provides a promising and facile option for improvement in the water transport properties through the polymeric semipermeable membranes with intrinsically low water permeability such as PBI. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45875.     

紧固件用Cr-Ni-Mo钢在调质和等温淬火条件下氢致延迟断裂的对比研究

采用阴极充氢、慢应变速率拉伸等试验方法, 研究了40CrNiMoA钢在调质和等温淬火条件下的氢致延迟断裂行为。实验结果表明, 在等温淬火条件下40CrNiMoA钢的抗氢致延迟断裂能力相对调质条件下的性能显著提高, 并且具有更高的硬度和抗拉强度。