Studies were made of the calculation of fractal dimension of transverse impact fracture surface, and of the correlation between impact toughness of steel and parameters of free-cutting phase by means of the developed fractal geometry model of crack propagation.

The free cutting phases in the S, S RE and S Ca RE system non quenching and tempering die steels for plastic moulding were analyzed by means of optical microscope, scanning electron microscope, electron probe microanalyser and quantimet.

For the free-machining steel, some earlier investigations showed that the globular inclusions are more helpful than the thready inclusions to improve the machinability.

A random fractal model for the crack propagation of free-machining steelsduring impacting transversely was proposed.

Microstructure and property of two kinds of free-cutting Al-Cu alloy;

Free-cutting Brass Containing Bi;

Research situation and outlook of free-cutting nonleaded brass;

Effect of Breakdown Process on Surface Cracking of Billet of Free Cutting Austenite Stainless Steel;

Mechanical Working Properties of Free Cutting Austenitic Stainless Steel 303F and 316F;

Application of Microalloy Free Cutting Steel 35MnVS for Connecting Rod of Auto-Engine;

Inclusion morphology control in medium-carbon calcium sulphur free-cutting steel;

A Study on Smelting and Properties of Tin-Bearing Free-Cutting Steel;

Process practice and analysis on free-cutting steel XY45;