一、前言1977年芬兰的 M·Johansson 宣布研制成奥贝球铁,并在许多国家取得专利。这种球铁以贝氏体型铁素体和奥氏体为基体,因而得名。由于组织中含有30～40％的奥氏体,不仅使这种球铁具有较高的塑性和韧性,具有优异的综合机械性能,而且由于奥氏体具有加工硬化能力,能显著提高其疲劳强度和耐磨性。这种材料特别适合于制造要求较高的齿 I. Preface In 1977, Johan Johansson of Finland announced the development of the Austrian ductile iron and obtained the patent in many countries. This ductile iron to bainitic ferrite and austenite as the matrix, hence the name. As the organization contains 30 to 40% of austenite, not only to make this ductile iron with high ductility and toughness, with excellent mechanical properties, and because of austenite with work hardening ability, can significantly improve its fatigue strength And wear resistance. This material is particularly suitable for making highly demanding teeth