METHOD OF HARDENING METAL ARTICLES FROM FERROMAGNETIC MATERIALS Russian patent published in 2002 - IPC

FIELD: mechanical engineering and woodworking industries; applicable in treatment of cutting tools and machine parts of various purposes including those found in assemblies. SUBSTANCE: method includes creation of regulated stressed state in surface layer with simultaneous filling of microfissures and pores. Regulated stressed state is created within ranges of flexibility of material surface layer. Microfissures and pores are filled with melt of coat from low-melting metals and high-melting ferromagnetic material with simultaneous treatment with heat and magnetic fields. Then stressed state is released, and heat and magnetic fields are removed. In this case, temperature heat field is selected below temperature of tempering of treated material and below temperature of corresponding to Curie point of coat ferromagnetic material. Intensity of magnetic field is set by value corresponding to magnetic saturation of ferromagnetic material. Direction of magnetic induction vector is combined with primary direction of development of microfissures and pores. Coat is used in the form of low-melting metals of Wood's alloy type or alloy of bismuth, lead and tin. High-melting ferromagnetic material is used in the form of metal powder of Armco iron. EFFECT: simplified technology, reduced time of treatment, increased fatigue (surface) strength of material in region of fissure formation. 3 cl, 1 tbl, 1 ex