Correlation between magnetic hysteresis Properties and Vickers hardness in cladded reactor pressure vessel steel

IF 0.5 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Journal of The Japan Institute of Metals Pub Date : 2017-01-01 DOI:10.2320/JINSTMET.JAW201702

Y. Aihara, Y. Kamada, T. Murakami, Satoru Kobayashi, Hideo Watanabe

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Abstract

We investigated the microstructure, magnetic hysteresis properties, and micro ︲ Vickers hardness of nuclear reactor pressure vessel （ RPV ） steel cladded with austenitic stainless steel. Characterization of the crystalline structure by electron backscatter diffrac tion revealed the existence of a delta ferrite phase in the austenitic cladding, and the formation of coarse and ﬁne grain microstruc - tures in the heat affected zone （ HAZ ） of the RPV steel. The block specimen was cut into small pieces and magnetic hysteresis loops were measured with a vibrating sample magnetometer. Although the saturation magnetization of the RPV steel was constant, the coercivity in the HAZ region decreased gradually as a function of distance from the weld fusion boundary. A linear correlation was conﬁrmed between the coercivity and hardness. This study demonstrates the feasibility of a magnetic evaluation of hardness and microstructures in RPV steel. ［ doi:10 . 2320 / jinstmet.JAW201702 ］

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包覆反应堆压力容器钢磁滞特性与维氏硬度的关系

研究了包覆奥氏体不锈钢的核反应堆压力容器(RPV)钢的显微组织、磁滞特性和微观︲维氏硬度。电子背散射衍射分析表明，RPV钢在奥氏体包层中存在δ铁素体相，在热影响区(HAZ)形成了粗晶和细晶组织。将块状试样切成小块，用振动样品磁强计测量磁滞回线。虽然RPV钢的饱和磁化强度是恒定的，但热影响区内的矫顽力随着与焊缝边界距离的增大而逐渐减小。矫顽力与硬度呈线性相关。本研究证明了磁法评价RPV钢硬度和显微组织的可行性。[doi:10]2320 / jinstmet。JAW201702]

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