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首页> 外文期刊>ISIJ International >Nano-investigation on Grain Boundary Periodic Alternating Segregation Based on Divorced Coincident Segregation Mechanism, Resulted in the Replacement of Conventional Site Competition in Steels
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Nano-investigation on Grain Boundary Periodic Alternating Segregation Based on Divorced Coincident Segregation Mechanism, Resulted in the Replacement of Conventional Site Competition in Steels

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The segregation mechanism of alloying elements in prior austenitic grain boundaries of embrittled 5 precent Ni steels has been investigated by AES in previous studies, while that of improved 5precent Ni steels has not been clarified yet. In the present study, the segregating behavior of alloying elements in improved 5 precent Ni steels has been elucidated for the first time by applying FE-TEM with respect to the effects of soluble Al in the suppression of temper embrittlement and hydrogen embrittlement in the steels.It is consequently made clear by applying FE-TEM-EDS that alloying elements tend to segregate coinci-dently to grain boundaries, showing the asymmetric segregation according to solute interactions. The ob-served behavior is newly defined as the divorced coincident segregation, which is considered to result form the moderate site competitions is the deep potential well of McLean's equilibrium segregation. The di-vorced coincident segregation was investigated further along grain boundaries, where the periodic segrega-tion of Al and Si was found to vary alternately along grain boundaries analyzed.The beneficial effect of soluble Al in the two types embrittlement is attributed to the mechanism of spot toughening through the periodic decrease of solutes in grain boundaries. The principle of the divorced coin-cident segregation proposed in 5 precent Ni steels can be applicable not only to ordinary steels but also to other poly-crystalline alloys in improving their properties.

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