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一、前言淬透性是钢材质量的重要指标之一。无论选用钢材还是对钢制件实施热处理工艺,或者研制新钢种,都必须了解和注意钢的这种属性。特别对调质结构钢更应重视。大型锻件从保证高的综合机械性能考虑,希望淬火后获得马氏体组织。但生产实践和理论研究表明,在淬火时一般不易完全得到马氏体,有时仅仅是表层,甚至表层也得不到马氏体。淬火时往往处于中温阶段转变。过冷奥氏体在中温阶段转变获得下贝氏体组织,经高温
First, the preface Hardenability is one of the important indicators of steel quality. Regardless of the selection of steel or steel parts of the heat treatment process, or the development of new steel, we must understand and pay attention to this property of steel. In particular, quenched and tempered structural steel should pay more attention. Large forgings to ensure that the high comprehensive mechanical properties of the hope that martensitic tissue after quenching. However, production practices and theoretical studies show that in quenching is generally not easy to get martensite, and sometimes only the surface, and even the surface martensite can not be obtained. Quenching is often in the mid-temperature stage of change. Undercooled austenite phase transition in the lower bainite tissue, the high temperature