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1 前言双层辉光离子渗钨钼手用钢锯条,为我研究所1978年研制成功,现已形成一定生产能力。在试验室试验中,渗金属炉体积小,渗后冷却速度快,渗层析出物细小,切削性能及韧性皆可达到技术要求。但在工业生产中,炉子容量大,渗后冷却速度慢,渗层中析出大块状、针状或网状析出物,造成崩齿过早失效。本文针对此问题,研究析出物形成条件,并测定其 TTT 曲线,为双辉渗锯条工艺参数制定,冷却速度的控制,渗金属炉结构设计提供依据。2 试验材料及方法试样为20钢,尺寸为φ15mm×5mm。源极材料为 W20Mo80粉末冶金合金。
1 Preface Double glow ion infiltration tungsten molybdenum hand hacksaw blade, for the successful development of our Institute in 1978, has now formed a certain production capacity. In the laboratory test, the metalizing furnace has the advantages of small volume, fast cooling after permeation, fine disseminated precipitate, cutting performance and toughness, all of which can meet the technical requirements. However, in industrial production, large furnace capacity, slow cooling after infiltration, seepage precipitated massive, needle-like or reticular precipitates, resulting in premature collapse of tooth failure. In view of this problem, this paper studied the conditions for the formation of precipitates and measured their TTT curves, which provided the basis for the design of process parameters, the control of cooling rate and the structural design of metal infiltration furnace. 2 test materials and methods Sample 20 steel, size φ15mm × 5mm. The source material is W20Mo80 powder metallurgy alloy.