With the rapid development of modern industry and science and technology, the number of wear-resistant plates in petrochemical, heavy machinery, food and other industries is increasing at the same time, but also put forward higher requirements for its performance. There are many kinds of wear-resistant plates, including martensitic, austenitic, ferritic, biphase and precipitation-hardened five categories, of which martensitic wear-resistant plates can adjust their properties through different heat treatment processes, and are widely used. Therefore, only by in-depth analysis of the effects of various heat treatment processes on the microstructure and mechanical properties of martensian-type wear-resistant plates, can the characteristics of Martensian-type wear-resistant plates be better played. In this paper, the influence of tempering temperature on the microstructure and mechanical properties of 1Cr13 wear-resistant plate was studied.
1Cr13 martensitic wear-resistant plate was selected as the sample material and selected along its rolling direction. After heat treatment, the size of the metallographic sample was 10mm×10mm×20mm, and the chemical composition of the sample (mass fraction, %) was as follows: 0.14C, 0.89Si, 0.73Mn, 0.030P, 0.022S, 0.47Ni, 12.30Cr, residual Fe. The 1Cr13 wear-resistant plate was treated with 980, 1050 and 1100℃ oil quenching, and then its hardness and metallographic structure were measured and observed. After analysis and comparison, the sample after quenching at 1050℃ is selected as the test material. The Rockwell hardness of the sample under the quenching condition is 39 ~ 42HRC, the microstructure is lath martensite, the organization is more uniform, and the high temperature ferrite content is not more than 10%. The samples after 1050℃ oil quenching were tempered at 200℃~750℃, and then the samples after tempering were analyzed and tested.
The tempering temperature has a significant effect on the microstructure of 1Cr13 wear-resistant plate. When the temperature is above 450℃, a small amount of alloy carbides precipitate along the grain boundaries, and when the temperature is above 600℃, the alloy carbides begin to aggregate and grow and spheroidize along the grain boundaries. The tempering temperature has a significant effect on the hardness, tensile strength and impact toughness of 1Cr13 wear-resistant plate. With the increase of tempering temperature, the hardness and tensile strength of 1CR13 wear-resistant plate decrease, but the impact toughness increases significantly. Using the heat treatment process of 1050℃ oil quenching +650 ~ 750℃ air cooling tempering, the sortenite structure and good comprehensive mechanical properties can be obtained.
