γ′析出合金的强化机制

D. Raynor, J. Silcock
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引用次数: 217

摘要

摘要研究了几种含γ′沉淀的奥氏体钢的力学性能。在时效过程中,由于颗粒在析出相的体积分数几乎恒定的情况下生长,证明应力会大幅增加。在峰值证明应力之前,由于高反相域边界能量,位错是成对的,这与弗里德尔关于有效粒子间距与粒子强度的理论相结合,令人满意地解释了证明应力的增加。钛铝比越高,反相畴边界能越高。0 ~ 0.4%的偏差对屈服强度没有影响。无论错配与否,大颗粒都被欧罗文环绕过。在环化过程中,从成对位错到单位错的转变发生,减小了随粒径增加而产生的应力下降。稳定的奥罗文环产生的背应力在低应变下可检测到。这导致了Fisher、Hart和Pry机制的加工硬化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strengthening Mechanisms in γ′ Precipitating Alloys
AbstractThe mechanical properties of several austenitic steels containing γ′ precipitate have been studied. A large increase in proof stress occurs during ageing as a result of particle growth at almost constant volume fraction of precipitate. Up to the peak proof stress, dislocations are paired owing to the high antiphase-domain boundary energy and this, in conjunction with Friedel's theory relating effective particle spacing to particle strength, satisfactorily accounts for the increasing proof stress. The value of the antiphase-domain boundary energy is higher at higher Ti/Al ratios. Misfits between 0 and 0·4% have no influence on yield strength. Large particles are by-passed by Orowan looping irrespective of misfit. During the looping process a transition from paired to single dislocations occurs that reduces the fall in stress with increasing particle size. Stable Orowan loops give rise to a back-stress that is detectable at low strains. This causes work-hardening by the Fisher, Hart, and Pry mechani...
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