摘要
采用金相观察、硬度测试、冲击和拉伸等试验,研究了回火温度与45钢亚温淬火强韧化的关系,并对相关影响因素进行了讨论。结果表明,亚温淬火温度高于770℃,其淬火态硬度不低于840℃常规淬火硬度。回火温度对亚温淬火硬度的影响表现在低于400℃回火时,其回火组织的硬度高于840℃常规淬火、回火的硬度;但高温回火时,其回火硬度的变化与之相反。在200～600℃整个回火温度区间,亚温淬火回火强度均低于840℃常规淬火、回火强度,但回火韧性与其相反。回火温度为400℃时,亚温淬火、回火强度出现极值。残留铁素体对回火硬度及韧性的改善大于对回火强度的改善。
The relationships between the tempering temperature and strengthening and toughening of sub-critical quenched 45 steel were investigated by metallographic examination, hardness testing, impact and tensile experiments and related factors were discussed. The results show that when the sub-critical quenching temperature is higher than 770 ℃, quenching hardness is not lower than conventional quenching hardness at 840 ℃. The effect of the tempering temperature on the hardness of sub-critical quenching microstructure shows the tempering hardness at temperature below 400 ℃ is higher than that of conventional quenching at 840 ℃ following the tempering at same temperature. Whereas high temperature tempering is performed, tempering hardness changes in contrast. At the tempering temperature range from 200 ℃ to 600 ℃, the strength of the sub-critical quenching and tempering is lower than that of conventional quenching at 840 ℃ and tempering, but there is the contrary trend for tempering toughness. The strength of the sub-critical quenching following tempering at 400 ℃ reaches the extremum. The imorovement on temDerinz hardness and toughness bv residual ferrite exceeds that on the temuerine strength.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第10期100-104,共5页
Heat Treatment of Metals
关键词
45钢
亚温淬火
回火温度
强韧化
45 steel
sub-critical quenching
tempering temperature
strengthening and toughening
