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bainite starting temperature
相关语句
  贝氏体转变开始温度
     The bainite starting temperature decreases with the increase of cooling rate and increases with the increase of strain under continuous cooling conditions.
     在连续冷却条件下,随着冷却速度的增加,贝氏体转变开始温度下降,随着变形量的增加,贝氏体转变开始温度有所升高。
短句来源
     Bainite transformation is accelerated when deformed at 950 ℃ in the view of bainite starting temperature.
     从贝氏体转变开始温度来看,950℃变形时,对贝氏体相变有促进作用。
短句来源
  相似匹配句对
     ON TEMPERATURE
     谈谈温度
短句来源
     Starting with B.B.O.
     本文从B.B.O.
短句来源
     The temperature for R.
     越冬卵孵化起点温度低于4℃。
短句来源
     Battery and low Temperature starting
     蓄电池与低温起动
短句来源
     In view of the starting transformation temperature, the bainite transformation is extended when deformed at 950 ℃ .
     从贝氏体转变开始温度看,950℃变形促进了贝氏体相变;
短句来源
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Previous investigations[1—4]on thermodynamics of bainite transformationmainly focused attention upon the calculation of driving force of transformation.As these calculations do not yield physical quantities of bainite transformationwhich can be measured experimentally,no definite conclusions can be drawnabout the correctness of such investigations.In this paper,a new model of the bainite transformation in steels duringthe initial stage of transformation is proposed.The authors visualize two...

Previous investigations[1—4]on thermodynamics of bainite transformationmainly focused attention upon the calculation of driving force of transformation.As these calculations do not yield physical quantities of bainite transformationwhich can be measured experimentally,no definite conclusions can be drawnabout the correctness of such investigations.In this paper,a new model of the bainite transformation in steels duringthe initial stage of transformation is proposed.The authors visualize two stepsin their model:(1)the carbon in austenite(carbon content x)is redistributed,then(2)local carbon-depleted portions(carbon content x')transform to bainiticferrite by shear mechanism.According to this model,bainite start temperature Bs can be calculated th-rough Bs(x)=Ms(x′),x′=ax+b.The calculated results are in good agreementwith the experimental values of Cr steels[8]and CrMo steels[14].Again according to this model,for Fe-C systems the minimum driving forcecalculated is about 230 cal/mol,which indicates that the formation of bainiticferrite by shear mechanism is possible.Thus the previous investigators' doubtthat driving force is not large enough to drive shear transformation is believedto be resolved.It is worth pointing out that the crystallographic and kinetic conclusionsresulting from this model are also consistent with experimental observation.Theauthors believe that such consistency lends additional support to the usefulnessof their model.

贝氏体转变开始的模式可表示为γ→γ′+γ_1→α′+γ_1,由此提出了计算贝氏体转变开始温度 B_s 的公式,B_s(x)=M_s(x′),x′=Ax+B(

The continuous cooling transformation of niobium-bearing low carbon steel and plain low carbon steel under different transformation conditions were investigated by utilizing Gleeble-1500 thermomechanical simulator.The continuous cooling transformation curves were determined by thermal dilation method and metallographic method.The microstructure evolution of these steels were analyzed and compared.Hardness of the niobium-bearing low carbon steel under different strains was measured.The research results show ferrite...

The continuous cooling transformation of niobium-bearing low carbon steel and plain low carbon steel under different transformation conditions were investigated by utilizing Gleeble-1500 thermomechanical simulator.The continuous cooling transformation curves were determined by thermal dilation method and metallographic method.The microstructure evolution of these steels were analyzed and compared.Hardness of the niobium-bearing low carbon steel under different strains was measured.The research results show ferrite start temperature and bainite start temperature were decreased by addition of Nb.Bainite transformation region was enlarged by addition of niobium.There is much more bainite in niobium-bearing low carbon steel.The lath of bainite deformed at 950 ℃ were larger in length and width than deformed at 850 ℃.For niobium-bearing low carbon steel the hardness become low when cooling rate was less than 1 ℃/s,which is because the formation of large amount of ferrite.When cooling rate was larger than 1 ℃/s,the hardness was increased suddenly because of the formation of bainite.

用G leeb le-1500热力模拟实验机研究了含铌低碳钢和普通低碳钢经不同变形条件下连续冷却过程的相变规律,利用热膨胀法结合金相法得到了连续冷却转变曲线,分析比较了它们的组织演变规律,测定了含铌低碳钢在不同温度和不同变形量下硬度的变化。研究结果表明,铌的加入使铁素体转变开始温度降低,使贝氏体转变温度降低,铌对贝氏体的转变产生了抑制作用.同时铌的加入扩大了产生贝氏体的冷速范围,含铌低碳钢中贝氏体的量显著增多.含铌钢在950℃变形时贝氏体板条长度和宽度比850℃变形时大。对含铌低碳钢,在冷却速度低于1℃/s时,由于生成大量的铁素体,导致了硬度降低;而冷却速度大于1℃/s时,基体中出现了贝氏体使硬度突然增加.

The continuous cooling transformation and isothermal transformation of niobium microalloyed low carbon steel after deformation were investigated by using a Gleeble-1500 thermomechanical simulator.The influence of deformation parameters on bainite transformation was analyzed.The results indicate that bainite start temperature decreases with the raising of cooling rate and increases with the increasing of deformation temperature.Deformation has an accelerating effect on the bainite transformation...

The continuous cooling transformation and isothermal transformation of niobium microalloyed low carbon steel after deformation were investigated by using a Gleeble-1500 thermomechanical simulator.The influence of deformation parameters on bainite transformation was analyzed.The results indicate that bainite start temperature decreases with the raising of cooling rate and increases with the increasing of deformation temperature.Deformation has an accelerating effect on the bainite transformation when the specimens are deformed at 950℃.When the deformation temperature increases,the effects of deformation on bainite start temperature diminish.Bainite amount decreases and proeutectoid ferrite amount increases as the deformation amount increases at a constant temperature.The formation of high temperature equiaxed ferrite is accelerated and bainite transformation is retarded when deformed temperature is below 900℃,and the amount of bainite increases with the increasing deformation temperature due to the influence of proeutectoid ferrite.The incubation period is shortened and the bainite transformation is accelerated by deformation under isothermal condition.The nose temperature of bainite transformation is 500℃,the upper limit temperature for bainite transformation is 600℃.

利用Gleeble-1500热力模拟实验机研究了铌微合金低碳钢连续冷却过程及等温过程贝氏体相变,分析了热变形参数对贝氏体相变的影响规律。研究表明,在连续冷却条件下,随着冷却速度的增加,贝氏体转变开始温度降低。随着变形温度的升高,贝氏体转变开始温度升高。从贝氏体转变开始温度来看,950℃变形时,对贝氏体相变有较明显的促进作用,当变形温度升高,变形的作用减弱。在相同变形温度情况下,随着变形量的增加,先共析铁素体的量增多,贝氏体量随之减少。变形温度在900℃以下时,变形促进了高温等轴铁素体的形成,同时由于先共析铁素体的影响而间接影响了贝氏体的量,导致了随变形温度的升高贝氏体量有所减少。在等温条件下,形变不仅缩短贝氏体相变的孕育期,而且促进了贝氏体的相变,贝氏体转变的鼻尖温度为500℃,贝氏体转变的上限温度为600℃。

 
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