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一、前言 3Ni24Cr2合金(4J24)的化学成分为0.25—0.35％C、22—25％Ni、2—3％Cr余Fe。这种合金传统上被广泛地用作热双金属片的主动层。近来,又因它具有比较高的热膨胀系数和无磁性而被用来作一些继电器的接触元件和汉字打字机上的打印头、调节垫片等。在应用中,保持材料的热膨胀特性和无磁性的稳定性,是人们关心的问题。 3Ni24Cr2合金在室温附近是由不稳定的奥氏体γ相组成,在冷加工和冲裁过程中会产
I. Introduction The chemical composition of 3Ni24Cr2 alloy (4J24) is 0.25-0.35% C, 22-25% Ni and 2-3% Cr residual Fe. This alloy has traditionally been widely used as an active layer for thermal bimetallic sheets. Recently, because of its relatively high coefficient of thermal expansion and non-magnetic properties, it has been used as a contact element for some relays and printheads, adjusting pads and the like on a Chinese typewriter. In applications, it is a matter of concern that the thermal expansion characteristics and the non-magnetic stability of the material be maintained. 3Ni24Cr2 alloy near the room temperature is composed of unstable austenite γ phase, in the cold and stamping process will produce