Abstract:
The iron-based alloy cladding layers with mass fractions of 0, 0.7%, 1.4% and 2.0% of La
2O
3 were prepared on the surface of 35CrMoV steel by laser cladding. The effect of La
2O
3 concent on the microstructure, phase composition, microhardness, friction and wear resistance and impact abrasive wear resistance of the cladding layer was studied. The results show that the cladding layer without La
2O
3 was mainly composed of FeCr solid solution and Cr
23C
6, and LaNi
3 appeared in the cladding layer after adding La
2O
3. When the mass fraction of La
2O
3 was 1.4%, the interface between cladding layer and matrix was smooth, the metallurgical bond was good, and the microstructure was fine and uniform. With the increase of La
2O
3 mass fraction, the microhardness, friction and wear resistance and impact abrasive wear resistance of the cladding layer first increased and then decreased. When the mass fraction of La
2O
3 was 1.4%, the wear resistance was the best. At this time, compared to the cladding layer without La
2O
3, the friction and wear mechanism of the cladding layer changed from severe adhesive wear to mild ploughing wear. And the furrows and irregularity on impact abrasive wear surface disappeared, and the surface tended to be flat.