冷轧压下率和退火温度对H62黄铜组织性能的影响

Effects of cold rolling reduction and annealing temperature on the microstructures and properties of H62 brass

利用OM、SEM和室温拉伸试验系统研究了冷轧压下率和退火温度对黄铜组织性能的影响.结果表明:随压下率和退火温度的增加,H62黄铜晶粒尺寸均逐渐增大,强度逐渐降低,伸长率先上升后下降;400℃退火时,α相开始发生再结晶,β相沿α相晶界均匀分布,500℃及以上退火时,α相已完成再结晶,β相将逐渐回溶到α基体中;H62黄铜在56.5%的冷轧压下,600℃退火时能获得最优的力学性能.

Effects of cold rolling reduction and annealing temperature on microstructures and mechanical prop-erties are investigated using OM, SEM observation and tensile technique. Results show that with the increase of cold reduction and annealing temperature, the average grain size of H62 Brass increases gradually with the decrease of strength, and the total elongation decreases after increasing. When the annealing temperature rises to 400 ℃, the recrystallization of α phase begins. The β phase is distributed uniformly along grain boundaries of α phase. Annealing at 500 ℃ or a higher temperature, the recrystallization of α phase will be completed and the β phase will be redissolved into α matrix. The optimal mechanical properties can be obtained with 56.5 %cold rolling reduction and 600 ℃ annealing of H62 brass.