No abstract

Herein, a kind of the ultrastrong low alloy wear‐resistant steel suitable for excavator bucket teeth is prepared. The ultrastrong steel with good toughness and wear resistance is successfully prepared by the forging, quenching, and tempering processes. The yield strength, tensile strength, elongation, and hardness of the ultrastrong steel reached up to 1700, 1960 MPa, 7%, and 563HV, respectively. Optical microscope (OM), scanning electron microscope (SEM), and transmission electron microscope (TEM) are used to observe the microstructures of the ultrastrong steel. After the forging, quenching, and tempering, two types of martensite laths are formed in the matrix of the ultrastrong steel, i.e., the coarse laths with low‐density dislocations and the thin laths with high‐density dislocations and some ε‐carbides. Low‐temperature tempering allows the carbides to precipitate in large quantities, and maintains the matrix with high density dislocations in the thin laths, which is the micromechanism of the steel with high strength and high toughness, and good wear resistance.

No abstract