公开(公告)号：WO1979000274A1

公开(公告)日：1979-05-17

申请号：PCT/CH1978000035

申请日：1978-11-02

Applicant: FISCHER AG G

Inventor： FISCHER AG G ,  HENYCH I

IPC: C21D05/04

CPC classification number: C22C37/06 ,  C21D5/04

Abstract: Hitherto metal pieces made of alloy cast iron Fe/Cr and exposed to wear, of which the basic mass had a martensitic character, contained, without any exception, secondary carbide deposits; this was due to the fact that these pieces, once cast, were first cooled to room temperature and, only after, submitted to high temperature treatment for the hardening. On the other hand, the metal pieces intended for exposure to wear and obtained according to the invention are substantially free of secondary carbide deposits; this is achieved as follows: the unmoulding of the moulded cores is done immediately after solidification and without any cooling under the perlite point AC u ; then, in order to destabilize the austenite, it is kept during five hours at least at a temperature above the perlite point AC u; after, the temperature is gradually lowered until it reaches room temperature, while avoiding, nevertheless, the formation of perlite and bainite. There is substantially no elimination of secondary carbides which cause deterioration of the physical characteristics of the pieces in question. The pieces obtained according to the invention are of improved and more uniform quality and have a higher resistance to deformation, while having the same resistance to wear.

Abstract translation: 迄今为止，由合金铸铁Fe / Cr制成的金属片，其基本质量具有马氏体特性，并且容易磨损，无一例外地包含二次碳化物沉积物; 这是因为这些一次铸造的材料首先被冷却至室温，并且仅在经过高温处理以进行硬化之后。 另一方面，用于暴露于磨损并根据本发明获得的金属片基本上不含二次碳化物沉积物; 这是通过以下方式实现的：模制芯的脱模在固化之后立即进行，在珍珠岩点AC u下没有任何冷却; 然后，为了使奥氏体不稳定，至少在高于珍珠岩点AC u的温度下保持5小时; 之后，温度逐渐下降至达到室温，同时避免了珍珠岩和贝氏体的形成。 基本上没有消除二次碳化物，导致所讨论的碎片的物理特性恶化。 根据本发明获得的件具有改进的和更均匀的质量，并且具有更高的抗变形性，同时具有相同的耐磨性。