Transformation Behavior and Microstructure in a 40Cr_2Ni_2MoV Cast Steel

The transformation behavior of a 40Cr2Ni2MoV cast steel manufactured by electroslag remelting (ESR) has been investigated. Compared to a forged steel, the incubation periods for both the pearlite and bainite transformations are shorter, but the transformation times are longer. The austenite is easier to transform into martensite. Optical microscopy and TEM indicated that there were variations in microstructure during the super-cooled austenite transformation. This is attributed to an inhomogeneous austenite, resulting from the segregation of elements during the ESR solidification.

ADI破碎机棒锤的研制

针对破碎机棒锤的工况条件和失效形式,合理设计了棒锤的试制方案。通过化学成分、熔炼和热处理工艺的控制,最终获得洛氏硬度≥40 HRC、抗拉强度>1 300 MPa、伸长率>3%的ADI铸件。同等工况下,ADI棒锤的使用寿命是40Cr铸钢材料棒锤的2倍以上。