【摘要】 对球化退火CrMo钢进行了冷形变、性能测试及TEM组织观察.结果表明:形变量为29.3%的冷变形合金,再结晶温度为600℃;该合金经不同的温度退火,在300℃出现峰值强度,其中高密度位错缠结束集形成的亚晶是产生峰值强度的主要原因;随退火温度提高,发生亚晶合并长大,晶界面积减少,因而使强度降低,塑性提高.更多还原

【Abstract】 The structure and properties of a CrM o steel after cool drawing deformati on are studied by means of TEM observation and measuring of recrystallization temperature.Results s how that 600℃is determined as the recrys-tallization temperature for the ste el with the cool drawing deformation ofε=29.3%.The maximumstrength of the steel occurs at 300℃in the curvesσ-temperature,which inainly result s from the role of subgrain strengthening within the ferrite matrix.The subgrains may be formed fromthe clusterin g of the dislocation tangles.The subgrains are grown up and the magnitude of the g rain boundaries are decreased with t he increase of annealing temperatur e,which results in the yield strength r educed and the toughness improved.更多还原