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一、引言很久以来,在研究某些含有合金元素的钢的配火过程时,会经发现到这样一种特殊的现象,即当这些钢在100～400℃的温度范围内配火时,随着配火温度的增加,钢的硬度发生相对的逐渐降落,而当进一步增加配火的温度时,则硬度的降落完全停止,有时且会使硬度增加到比淬火后还高的情况,这种硬度的增加达到某一极大值之后又形降落。最早被研究的对象:是含有大量合金元素的高速钢。淬火高速钢于300～400℃范围内配火后的硬度为59～62Rc;但在更高的温度范围(500～600℃)内配火时,硬度会增高到64～65 Rc。这种合金钢在高温配火后所发生的硬度增加,在一般文
I. INTRODUCTION For a long time, when studying the matching process of some steel containing alloying elements, it was found that such a special phenomenon is that when these steels are equipped with fire in the temperature range of 100-400 ° C, With the increase of the temperature of the fire, the hardness of the steel gradually drops, while when the temperature of the fire is further increased, the drop of the hardness stops completely and the hardness sometimes increases to a higher level than that after quenching The increase in hardness reaches a certain maximum and then descends. The earliest studied object: is a high-speed steel containing a large amount of alloying elements. Quenched high-speed steel in the range of 300 ~ 400 ℃ after the fire hardness of 59 ~ 62Rc; but in the higher temperature range (500 ~ 600 ℃) with fire, the hardness will increase to 64 ~ 65Rc. The hardness of the alloy steel after high temperature fire increases, in general