冲击磨损下团球状共晶体奥-贝钢磨损表面层组织的变化

采用ＭＬＤ－１０型磨损试验机、扫描电镜和透射电镜等研究了冲击磨损条件下团球状共晶体奥－贝钢磨损表面组织的变化。结果表明：奥－贝钢的冲击磨损表层中存在非晶态组织和纳米级晶粒；磨损亚表层中存在大量位错马氏体和形变贝工体组织；奥－贝钢从亚表层到磨损表面方向的硬度逐渐增加，具有梯度分布特征，能够有效抵抗磨料的冲击和凿削作用，同时磨损亚表层中的位错、形变马氏体和贝氏体组织具有很好的强韧性匹配，可抑制高冲击下

Microstructure Transformation in the Worn Surface Layer of Austenite-Bainite Steel with Nodular Eutectics during Impact Wear

The microstructure transformation in the impacted worn surface layer of austenite bainite steel with nodular eutectics(abbreviated as ABNE steel) was investigated with a transmission electron microscope and MDL wear tester. Amorphous structure and nano sized grain in the impacted worn surface layer and dislocation, twin crystal, strain martensite, and deformed bainite structure in the subsurface layer were observed.As the result, the hardness of worn surface increased gradually from the subsurface layer to the worn surface of steel and distributed gradiently, which effectively resisted the impacting and drilling of the abrasive. The dislocation, twin crystal, strain martensite and deformed bainite structure in the subsurface layer having good matching of strengthening and toughening could act to avoid the production of microcracks.This contributed to the good impact wear resistance of ABNE steel.