中英文对照机械专业英语文章

发布日期:[10-12-26 11:51:49] 浏览人次:[]

ould be held at that temperature for a sufficient period of time to permit its thickest section to attain a uniform temperature.

即使加热到正确的温度后,工件也应在此温度下保持足够时间以让其最厚截面达到相同温度。

The hardness obtained from a given treatment depends on the quenching rate, the carbon  content, and the work size. In alloy steels the kind and amount of alloying element influences only the hardenability (the ability of the workpiece to be hardened to depths) of the steel and does not affect the hardness except in unhardened or partially hardened steels.

通过给定的热处理所得到的硬度取决于淬火速率、含碳量和工件尺寸。除了非淬硬钢或部分淬硬钢外,合金钢中合金元素的种类及含量仅影响钢的淬透性(工件被硬化到深层的能力)而不影响硬度。

Steel with low carbon content will not respond appreciably to hardening treatment. As the carbon content in steel increases up to around 0.60%, the possible hardness obtainable also increases.

含碳量低的钢对淬火处理没有明显的反应。随着钢的含碳量增加到大约0.60%,可能得到的硬度也增加。

Above this point the hardness can be increased only slightly, because steels above the eutectoid point are made up entirely of pearlite and cementite in the annealed state. Pearlite responds best to heat-treating operations; and steel composed mostly of pearlite can be transformed into a hard steel.

高于此点,由于超过共析点钢完全由珠光体和退火状态的渗碳体组成,硬度增加并不多。珠光体对热处理作业响应最好;基本由珠光体组成的钢能转化成硬质钢。

As the size of parts to be hardened increases, the surface hardness decreases somewhat even though all other conditions have remained the same. There is a limit to the rate of heat flow through steel.

即使所有其它条件保持不变,随着要淬火的零件尺寸的增加其表面硬度也会有所下降。热量在钢中的传导速率是有限的。

No matter how cool the quenching medium may be, if the heat inside a large piece cannot escape faster than a certain critical rate, there is a definite limit to the inside hardness. However, brine or water quenching is capable of rapidly bringing the surface of the quenched part to its own temperature and maintaining it at or close to this temperature.

无论淬火介质怎么冷,如果在大工件中的热量不能比特定的临界速率更快散发,那它内部硬度就会受到明确限制。然而盐水或水淬火能够将被淬零件的表面迅速冷却至本身温度并将其保持或接近此温度。

Under these circumstances there would always be some finite depth of surface hardening regardless of size. This is not true in oil quenching, when the surface temperature may be high during the critical stages of quenching.

在这种情况下不管零件尺寸如何,其表面总归有一定深度被硬化。但油淬情况就不是如此,因为油淬时在淬火临界阶段零件表面的温度可能仍然很高。

Tempering    回火

Steel that has been hardened by rapid quenching is brittle and not suitable for most uses. By tempering or drawing, the hardness and brittleness may be reduced to the desired point for service conditions.

快速淬火硬化的钢是硬而易碎的,不适合大多数场合使用。通过回火,硬度和

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