Based on the previous work of SHCCT diagram developing of China low activation martensitic (CLAM) steel, the effect of thermal cycle on the microstructure and mechanical properties of CLAM steel weld is investigated using physical thermal simulation (Gleeble 3500) to control heat input accurately. Three conditions including single layer, double layer welding and post-weld heat treatment (PWHT) are involved. The results show that higher cooling rate leads to better grain refinement but higher hardness in the coarse grained heat affected zone. Precipitation of delta ferrite is relatively severe when the cooling rate is low. Thermal cycle during double layer welding has an obvious weakening effect on mechanical properties, which mainly results from the larger quantity of delta ferrite precipitates. The microstructure and mechanical properties of CLAM steel joints can be improved by PWHT. Hardness of heat-affected zone tends to keep uniform with the increase of tempering temperature.
We investigate the electrical detection of anisotropic antiferromagnetic/ferromagnetic (AFM/FM) domain walls in (2 at%) Pd-doped FeRh films. The Hall signals keep almost at zero at both AFM and FM states, while a sizeable Hall conductivity up to 300 (Ω cm)−1 emerges during the AFM–FM phase transition of Pd-doped FeRh films around room temperature. Such Hall signals could be ascribed to the transverse current scattered by the anisotropic AFM/FM domain walls, which are mainly aligned around the [1 0 0] axis of the Pd-doped FeRh films. The highly reproducible Hall signals in both the temperature and magnetic field-induced magnetic phase transition are supported by the observation of a nonrandom formation of AFM/FM domain walls. Our findings not only advance the understanding of the magnetic phase transitions, but also propose a considerable way for the detection of AFM/FM domain walls by an electrical means.
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