The study work is focused on the effect of temperature upon mechanical properties, creep, initiation and propagation of fatigue crack for the valve material.
着重温度对气门材料的力学性能、蠕变和疲劳裂纹形成与扩张的影响等问题进行分析和研究。
Effect of machining method or technique on material mechanical properties, such as its Effect on stress state, fatigue resistance, etc.
制造方法及技术对材料机械性能的影响，如对应力状态，抗疲劳性能等的影响。
The oxygen content of the materials used in our country is higher than that of the materials imported. Oxgen will greatly affect the fatigue properties as it forms oxide inclusions in material.
国内材料与国外先进材料的主要差别在于氧含量过高，氧在材料中形成氧化物夹杂，严重危害材料的疲劳性能。
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