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前 言 以SCr21Mn9N i4N（以下简称21—4N）为代表的奥氏体型耐热钢,因具有良好的热强铝化氧抗和性腐蚀能力,在内燃机制造行业得到了日益广泛的应用。但奥氏体钢硬度不足,耐磨性差,制作的气门杆部必须经过表面强化处理,方能满足服役条件的要求。众所周知,软氮化处理是提高零件的抗蚀性、耐磨性和疲劳强度的重要方法之一,特别是能使零件在高温摩擦情况下,具有抗擦伤和咬合的性能。故当前国内外大多数采用软氮化处理来提高气门的耐磨性和疲劳强度。本文结合我们在开发微型汽车排气门过程中的试验情况,对气门杆部的软氮化作一简要的分析。
Preface The austenitic heat-resisting steel, represented by SCr21Mn9N i4N (hereinafter referred to as 21-4N), has been widely used in the internal combustion engine manufacturing industry due to its excellent heat-resistant aluminized oxygen resistance and corrosion resistance. But austenitic steel hardness, wear resistance is poor, the production of the valve stem must be surface-enhanced treatment, in order to meet the requirements of service conditions. As we all know, nitrocarburizing is to improve the corrosion resistance of parts, wear resistance and fatigue strength of an important method, in particular, can make parts in the case of friction at high temperatures, with anti-galling and bite performance. Therefore, most of the current domestic and foreign soft nitriding to improve the valve wear resistance and fatigue strength. In this paper, we develop a micro-car exhaust valve in the process of testing the situation, the valve stem soft nitriding for a brief analysis.