分级时效处理，低温下先让合金内部的宏观应力松弛，再在较高温度下时效，可有效地避免棒材纵向开裂。
However, stepped aging, which relaxes internal macro-stress under lower temperature then ages under higher temperature, can avoid longitudinal cracks effectively.
弹簧的低温应力松弛是一个回复和动态回复的综合效应，它在某些晶粒较弱的微区内优先进行。
The stress relaxation process of spring at low temperatures is a combined effect of recovery and dynamic recovery, and it takes place mainly in weaker micro-regions of some sub-grains.
试验结果表明该环氧修补材料在低温情况下具有较好的力学松弛性能。
The test result indicates that this epoxy resin material has a better mechanical relaxation behavior under a lower temperature condition.
试验结果表明该环氧修补材料在低温情况下具有较好的力学松弛性能。
The test result indicates that this epoxy resin material has a better mechanical relaxation behavior under a lower temperature condition.
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