求合金的蠕变极限的关键是选择应力。实际工作中采用尝试法选择应力。这种方怯不但有盲目性,而且所选应力也不够准确。我们根据实践提出用β系数法来选择短时蠕变极限。这种方法根据β系数可有目的地选择应力,并可由实验直接得至δ_塑=0.2％的结果。一、β系数法的提出典型蠕变曲线示于图1。如图1所示δ_塑=δ_0+δ_I+δ_II+δ_III (1)式中δ-瞬时变形产生的塑性应变 The key to find the creep limit of alloy is to choose the stress. Try to choose the actual work stress. This square is not only blindness, but also the selected stress is not accurate enough. We propose to use the β coefficient method to select the short-term creep limit. This method allows for the selective selection of stresses based on the beta coefficient and can be experimentally obtained directly to a delta-plastic = 0.2% result. First, the beta coefficient method proposed typical creep curve shown in Figure 1. As shown in Figure 1 δ_plastic = δ_0 + δ_I + δ_II + δ_III (1) where δ-instantaneous deformation of the plastic strain