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为了弄清楚张力温加工对碳钢(铁素体+片状珠光体)室温下的应力松驰值△P/P。(△P:松驰负荷,p。:初负荷)的影响,研究了加工温度(20～320℃),应变和组织的作用。结果如下:(1)在大约220℃到270℃的温度范围中,在加工的试样上观察到应力松驰值的减少。这些加工温度与铁的碳化物和氮化物因变形而引起溶解增加,致使应变时效随之增大的温度相符。(2)当片状渗碳体由于在20℃到220℃温度范围中加工而被部分地破碎时,松驰值和对数时间之间的关系是蛇行曲线,并因此在松驰值上显示它们的最大值。(3)对片状渗碳体发生弯曲和破碎的钢,观察到呈线性关系,同时在这种情况下,松驰值随加工应变量的增加也成比例增大。
In order to clarify the tension temperature processing of carbon steel (ferrite + lamellar pearlite) at room temperature stress relaxation △ P / P. (△ P: relaxation load, p .: initial load), the effects of processing temperature (20 ~ 320 ℃), strain and microstructure were studied. The results are as follows: (1) A reduction in stress relaxation value was observed on the machined specimen in the temperature range of about 220 ° C to 270 ° C. These processing temperatures cause an increase in dissolution due to deformation of the iron carbides and nitrides, resulting in an increase in the temperature at which strain aging increases. (2) When the lamellar cementite is partially broken due to processing at a temperature in the range of 20 ° C to 220 ° C, the relationship between laxity and logarithmic time is a meandering curve and is therefore displayed on slack Their maximum value. (3) A linear relationship was observed for bent and broken steel with lamellar cementite, and in this case, the relaxation value increased proportionally with the increase of the amount of processing strain.