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Sinan Zhu,Chi Zhang,Zhigang Yang,Chenchong Wang 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
Reduced activation ferritic/martensitic (RAFM) steels are widely applied as structural materials in thenuclear industry. To investigate hydrogen's effect on RAFM steels' elastic properties and the mechanismof that effect, a procedure of first principles simulation combined with experiment was designed. Densityfunctional theory models were established to simulate RAFM steels' elastic status before and after hydrogen'sinsertion. Also, experiment was designed to measure the Young's modulus of RAFM steelsamples with and without hydrogen charging. Both simulation and experiment showed that the solubilityof hydrogen in RAFM steels would decrease the Young's modulus. The effect of hydrogen on RAFMsteels' Young's modulus was more significant in water-quenched steels than it was in tempering steels. This indicated that defects inside martensite, considered to be hydrogen traps, could decrease thecohesive energy of the matrix and lead to a decrease of the Young's modulus after hydrogen insertion.