摘要
4Cr13钢淬火态试样激光淬火后晶粒尺寸保持常规淬火水平 ,是快速加热组织遗传造成的结果。用激光能量密度概念 ,分析了加热工艺参数对 4Cr13钢非平衡组织淬火后显微硬度分布的影响。结果表明 ,原始状态不同的试样 ,有效硬化层深度 (d)与激光能量密度 ρE 存在下列关系 :原始淬火态dX=0 2 32 7·ρ0 4 82 1E mm ;淬火 +低温回火态dY=0 2 2 78·ρ0 4 659E mm ;淬火 +高温回火态dZ=0 1710·ρ0 3 72 6Emm。 4Cr13钢淬火态试样激光淬火后获得了超过常规淬火水平 2 5 %的超高硬度 ,其中马氏体含碳量增加对超高硬度的贡献约占 6 2 3%,马氏体尺寸细化、高密度位错强化等因素的强化作用约占 37 7%。
The austenite grain size of quenched samples of 4Cr13 steel was almost the same as quenched by laser beam. This was due to the structural inheritance occurred in laser speediness heating processing. The effects of laser treating parameters on microhardness distribution of 4Cr13 steel were analysed by using conception of Laser Energy Density(LED).The relationship between the effective hardened depth of laser-treated samples of various original structures and LED is shown as follows: for origianl quenched samples,d-x=0.2327·ρ 0.4821 E mm;for quenched and law temperature tempered samples,d-γ=0.2278·ρ 0.4659 E mm;for quenched and high temperature tempered samples,d-z=0.1710·ρ 0.3726 E mm. The hardness of the original quenched samples which were quenched by laser beam is about 25% higher than that one hardened conventionally.The contribution of carbon content increasing in martensite to ultrahigh hardness is about 62.3% of totals.The other factors,such as ultrafine martensite matrix,high density dislocation,offer about 37.3% of total strengthening effect.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2002年第4期25-29,共5页
Transactions of Materials and Heat Treatment
关键词
激光热处理
组织遗传
激光能量密度
强化机理
laser heat treatment
structural inheritance
laser energy density(LED)
strengthen mechanism
