Effect of Replacing Nickel with Manganese on Microstructure and Impact Corrosion and Abrasion Property of Low Carbon High Alloy Steel
The influences of replacing nickel with manganese on microstructure of low carbon high alloy steel were studied by metallographic microscope,X-ray diffraction instrument and microhardness tester.The behaviors of impact corrosion and abrasion of the low carbon high alloy steel adding nickel and replacing nickel with manganese were researched with a modified MLD-10 tester.The results show that as-annealed microstructure and as-quenched-tempered microstructure of the low carbon high alloy steel added nickel are both single-phase lath martensite.The as-annealed microstructure of the low carbon high alloy steel replacing nickel with manganese is upper bainite + troostite,after quenching-tempering,the microstructure is single-phase lath martensite.The impact corrosion and abrasion mechanisms of the two kinds of steel are almost the same.The impact corrosion and abrasion mechanism is micro-cutting,repeated plastic deformation and some corrosive wear within shorter time.After longer time,the impact corrosion and abrasion mechanism is mainly fatigue with shallow flaking accompanied with some cutting,repeated plastic deformation and some corrosive wear.