Molecular Dynamics simulation was employed to study precipitate composition dependence on strengthening. Edge dislocation interaction with pure, 80at.%, and 60at.% Cr precipitates of different sizes in a matrix of Fe-15at.%Cr was investigated. The precipitates were found to be relatively hard. This is evident from the absence of shearing mechanism after the dislocation has bypassed them, the formation of an Orowan-like dislocation shape, and comparatively higher stress values. Precipitates with higher Cr content were found to greatly impede dislocation glide as indicated by the time taken by the dislocation to bypass them. The composition dependence on critical unpinning stress was also observed. The interaction of edge dislocation with precipitates having higher Cr composition leads to higher critical unpinning stress. The extent of critical unpinning stress dependence on precipitate composition is, however, not as high as was reported previously. Besides, the study has also confirmed the fact that α’ precipitation results in the hardening of high Cr ferritic/martensitic steels.

分子动力学模拟被用来研究沉淀物成分对强化的依赖性。研究了在Fe-15at。％Cr基质中，不同尺寸的纯Cr，80at。％和60at。％Cr沉淀物的边缘位错相互作用。发现沉淀相对较硬。这从位错绕过它们之后不存在剪切机制，形成类似于Orowan的位错形状以及相对较高的应力值可以明显看出。如位错绕开它们所花费的时间所表明的，发现具有较高Cr含量的沉淀物极大地阻碍了位错滑动。还观察到成分对临界松脱应力的依赖性。边缘位错与具有较高Cr组成的沉淀物的相互作用导致较高的临界脱钉应力。但是，关键的松动应力对沉淀物成分的依赖性程度不如先前报道的那么高。此外，研究还证实了α'析出导致高Cr铁素体/马氏体钢硬化的事实。