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Research on low temperature toughness of wear-resistant plates
Wear-resistant plate is the most common steel used in engineering machinery. This steel requires good low-temperature toughness and weldability under high hardness. This article first uses the experimental study of impact toughness under a series of temperatures, because it is relatively easy to measure the material energy index and the test results are relatively rich and mature. However, the impact toughness index is still difficult to provide an effective evaluation of safety. In view of this, this paper uses a dynamic tear (DT) test close to the actual size to further study the low-temperature toughness of the wear-resistant plate. The test results show that both series impact and dynamic tear show a higher upper plateau and lower ductile-brittle transition temperature. , the material has good low temperature toughness.
The experimental material is JFE-C400 wear-resistant plate. Its production process is: converter + LF refining outside the furnace → mold casting → hot rolling → modulation (quenching + tempering). The plate thickness is 40mm, and the chemical composition is (mass fraction, %) :0.10C, 0.28Si, 0.42Mn, 0.001S, <0.005P, 3.0Ni, 1.0Cr, 0.25Mo. Samples were taken transversely along the surface and center of the wear-resistant plate, and standard specimens were processed according to the provisions of GB/T228-2002 "Metal Materials Room Temperature Tensile Test Method", and conventional tensile and Z-direction tensile tests and a series of impact tests were conducted. According to GB/T5482-2007 "Metal Materials Dynamic Tear Test Method", samples were taken and processed into 180mm×40mm×16mm specimens for a series of dynamic tear tests. The opening direction of the specimens was perpendicular to the rolling direction. The metallographic structure and grain size were corroded by 4% nitric alcohol, saturated picric acid + a small amount of detergent respectively. The tensile fracture morphology was observed using S4300 scanning electron microscope.
Industrially produced wear-resistant plates have fine grains and uniform structures. The wear-resistant plates have a low tough-to-brittle transition temperature and good low-temperature toughness, which guarantees the safety of engineering machinery. In the research method of low temperature toughness, it is found that large-scale dynamic tear test can further reveal the characteristics of ductile-brittle transition.
