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Directional solidification of metal-gas eutectic and fabrication of regular porous metals
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Directional solidification of metal-gas eutectic (Gasar) is a novel process for making regular porous metals.
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The calculation results indicated that the IHTC immediately increased after liquid metal was brought into the cavity by the plunger and decreased as the solidification process of the liquid metal proceeded.
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Higher heating rate inhibits the further melting of adjacent matrix and the solidification of liquid by liquid-to-γ mode in the subsequent thermal cycle.
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Creep-resistant magnesium alloy design, plastic processing of magnesium alloys and rapid solidification processing of magnesium alloys have become the hot topics in magnesium technology.
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| The pressure- viscosity (P- V) coefficient and solidification pressure values of lubrication oils are key testing date for the application of elasto-hydrodynamic theory to tribological design. The P-V coefficients of 20 Chinese lubrication oils were tested using the falling cylinder viscosimeter, and the lowest solidification pressure values of 16 lubrication oils among them were also obtained in this paper. The authors also made an analytical comparison between the different lubrication oils' P-V... The pressure- viscosity (P- V) coefficient and solidification pressure values of lubrication oils are key testing date for the application of elasto-hydrodynamic theory to tribological design. The P-V coefficients of 20 Chinese lubrication oils were tested using the falling cylinder viscosimeter, and the lowest solidification pressure values of 16 lubrication oils among them were also obtained in this paper. The authors also made an analytical comparison between the different lubrication oils' P-V coefficients and solidification pressure, these oils are: the base lubrication oils produced by three oil fields, the synthetic lubrication oils with different chemical structure and industrial lubrication oils having many uses. The results shown as follows: | 润滑油的压粘系数和固化压力是弹流理论应用于摩擦学工程设计的关键试验数据。本文报道了20种国产润滑油的压粘系数和其中16种润滑油的最小固化压力的测定结果,并对不同油田的基础润滑油、不同化学结构的合成润滑油和不同用途的工业润滑油的压粘系数和固化压力进行了分析比较。 | The effects of fretting slip amplitude, load and number of cycle on the fretting friction and wear behaviors of laser transformation hardened, laser melt-solidification cemented and annealed 2Cr13 stainless steel were investigated in this paper. The rasults shown that fretting wear volumes increase with the increasing of the above mentioned three parameters, the changes of the fretting friction coefficient is complicated: along with the increase of load it decreases rapidly at the first, and then this... The effects of fretting slip amplitude, load and number of cycle on the fretting friction and wear behaviors of laser transformation hardened, laser melt-solidification cemented and annealed 2Cr13 stainless steel were investigated in this paper. The rasults shown that fretting wear volumes increase with the increasing of the above mentioned three parameters, the changes of the fretting friction coefficient is complicated: along with the increase of load it decreases rapidly at the first, and then this decrease becomes more and more slowly and tends to stabilizing, the enlargement of fretting amplitude has no effect on the fretting friction coefficient. | 本文简要报道了微动振幅、循环数和负荷对分别经860C退火、激光相变硬化和激光熔凝渗碳处理的2Cr13不锈钢微动摩擦磨损性能之影响的研究结果。文章指出,这3种微动参量的增大都使微动磨损体积增大,但其对微动摩擦系数的影响却比较复杂:摩擦系数随循环数的增加先是急剧增大,然后增大速度明显减缓并逐渐趋于稳定;摩擦系数随负荷的增加而下降,其在负荷增至80N时达到最低点,然后又随负荷的增加面缓慢上升;微动振幅的增大对摩擦系数基本没有影响。 | The effect of Nb on the as-cast microstructures and the prespheroidization at elevated temperature of eutectic carbides of M2 high speed steel was studied. The experiments show that the block carbides increase with Nb content rise at fast cooling rate,and that when the Nb content is small the Nb carbides with particular shape would be precipitated during solidification at slow cooling rate,however, the Nb is not found in the matrix or the lamellar M2C carbides. The results also indicate that Nb has no... The effect of Nb on the as-cast microstructures and the prespheroidization at elevated temperature of eutectic carbides of M2 high speed steel was studied. The experiments show that the block carbides increase with Nb content rise at fast cooling rate,and that when the Nb content is small the Nb carbides with particular shape would be precipitated during solidification at slow cooling rate,however, the Nb is not found in the matrix or the lamellar M2C carbides. The results also indicate that Nb has no effect on the prespheroidization of M2C plate carbides, but the prespheroidization of Nb carbide is tool diffficult. | 研究了铌对Ｍ２高速钢的共晶碳化物组织和共晶碳化物高温球化的影响。试验表明：在快冷条件下，随着铌含量的提高，块状碳化物增多；在慢冷条件下，少量的铌就可使Ｍ２高速钢析出形状特殊的含铌碳化物；铌不进入基体和片状的Ｍ２Ｃ型碳化物、只存在于铌碳化物中，试验还表明：加入铌后不影响片状的Ｍ２Ｃ型碳化物的高温球化。但含铌碳化物本身高温球化很困难。 | | | | << 更多相关文摘 |
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