摘要
研究了采用预冷变形快速加热与低温形变热处理复合强化工艺处理的６７Ｂ及７２Ａ钢丝的组织与性能。结果表明：经过该工艺处理的６７Ｂ及７２Ａ钢丝晶粒度大于ＡＳＴＭＮｏ．１１．０级，对于３．５ｍｍ的钢丝，可获得σ＿ｂ＝１７５０～１９５０ＭＰａ，＞４５％，ｎ扭＞５，自身缠绕合格的超高强塑性能。不同工艺制做的该钢丝弹簧，在ｔ＝８０℃，τ＿０＝８００ＭＰａ的高应力作用下，工作１０年后的负荷损失率不大于７．４３％。测定了该钢丝弹簧的Ｇｏｏｄｍａｎ曲线，超细晶粒形变热处理６７Ｂ及７２Ａ钢丝弹簧的疲劳强度不低于世界先进国家同类弹簧水平。分别采用ＴＥＭ和ＳＥＭ进行组织结构分析和断口分析。
The microstructures and properties of 67B &72A steel wiers treated by the combination process of precold working,rapid heating and low temperature thermomechanical treatment were studied.Investigation results showed that grain size of the steel wires treated by this process is finer than ASTM No.11 and the steel wires obtained ultra high strength and toughness in properties,for diameter =3.5mm,σ_b=1750～1950MPa,>45%,cycles of twist testing greater than five and self coil testing meets the requirement.Stress relaxation and fatigue experiment of springs made by the steel wiers were also studied.The loss of load of cold presetted spring was 5.17% after ten years service,under conditions of t=80℃and initial stess l_0=800MPa.Goodman curves have been ploted according to the datum obtained by spring fatigue testing.The result showed that the fatigue strength is excellent compared with the same level in world advanced countries.The microstructure and fracture morphology of the treated steel wires and springs have been analysed by TEM and SEM technique respectively.
出处
《兵器材料科学与工程》
CSCD
北大核心
1994年第1期19-27,共9页
Ordnance Material Science and Engineering
基金
国家自然科学基金
关键词
超细晶粒
形变热处理
钢丝
弹簧
ultra fine grained thermomechnical treatment,wire,spring,stress relaxation,fatigue fracture
