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介绍日本超高强度气门簧用线材的发展过程:在SAE9254钢的基础上增加C含量,同时添加V元素,开发出KHV7钢,经过渗氮处理后,钢丝的疲劳强度提高到SAE9254钢的1.3倍;为减少回火造成的抗拉强度降低,使Si元素的质量分数达到2.0%,开发出KHV10N钢,经过渗氮处理和喷丸处理后,钢丝疲劳强度可以达到SAE9254钢的1.4倍;加大Cr,V的添加量,生产出超高强度的KHV12N钢,钢丝疲劳强度可以达到SAE9254钢的1.55倍。分析钢中各添加元素的作用机制和夹杂物对疲劳强度影响及控制方法,给出各钢种的化学成分组成、油淬火后钢丝的力学性能、退火后的钢丝力学性能及金相组织照片。
This article introduces the development process of wire rod for ultra-high strength valve spring in Japan. It increases the C content on the basis of SAE9254 steel and adds V element to develop KHV7 steel. After nitriding, the fatigue strength of wire increases to 1.3 times that of SAE9254 steel ; To reduce the tempering caused by reduced tensile strength, so that the Si mass fraction of 2.0%, the development of KHV10N steel, after nitriding and shot peening, the wire fatigue strength can reach SAE9254 1.4 times the steel; increase Cr, V added to produce ultra-high-strength KHV12N steel, steel wire fatigue strength can reach 1.55 times the SAE9254 steel. The mechanism of the added elements in the steel and the influence of the inclusions on the fatigue strength were analyzed. The chemical composition, the mechanical properties of the steel after quenching, the mechanical properties of the annealed steel and the microstructure pictures of the steel were given.