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退火温度和退火时间是影响低碳钢旋压件再结晶退火后微观组织及力学性能的主要因素。对不同减薄率的旋压件采取变温恒时和恒温变时的方法,研究退火温度及退火时间对20钢经强力错距旋压后的变形组织及力学性能的影响。试验结果表明,在560℃～600℃区间,旋压件硬度随退火温度的升高急剧减小,退火时间对试样力学性能的影响随退火温度的升高变得更明显;在580℃时保温1h退火后,铁素体均转变成等轴状细晶,晶粒尺寸约0.6μm,尺寸更细小的渗碳体颗粒大部分弥散在铁素体晶界上。
Annealing temperature and annealing time are the main factors affecting the microstructure and mechanical properties of the low carbon steel spinning after recrystallization annealing. The effects of annealing temperature and annealing time on the deformation microstructure and mechanical properties of 20 steel after being spun strongly with different rotational speeds were studied by means of variable temperature constant and constant temperature varying for spinning parts with different thinning rates. The experimental results show that the hardness of spinning parts decreases sharply with the increase of annealing temperature in the range of 560 ℃ ~ 600 ℃, and the effect of annealing time on the mechanical properties of samples becomes more obvious with the increase of annealing temperature. At 580 ℃ After annealing for 1h, the ferrite transformed into fine equiaxed grains with a grain size of about 0.6μm. The finer cementite particles dispersed in the ferrite grain boundaries.