团球状共晶体奥氏体-贝氏体钢抗冲击磨料磨损行为

WEAR BEHMIOR OF AUSTENITE-BAINITE STEEL WITH NODULAR EUTECTICS IN IMPACT ABRASION

采用ＴＥＭ，ＳＥＭ；电子探针和 ＭＤＬ－１０型动载磨料磨损实验机研究 Ｍｇ－Ｃｅ－ＡＩ复合变质团球状共晶体奥－贝钢（简称ＡＢＮＥ钢）复相组织的形成及抗冲击磨料磨损行为结果表明，钢中贝氏体组织由板条铁素体与残余奥氏体组成，团球状共晶体是（Ｆｅ， Ｍｎ）３Ｃ和奥氏体两相伪共晶组织 ＡＢＮＥ钢在中、低冲击工况下耐磨性优于奥－贝钢、奥－贝球铁、团球状碳化物中锰钢，其原因与国球状共晶体可有效地减轻磨料的侵入深度和阻碍微切削作用，以及磨损表面形成大量纳米晶粒和非晶态组织。

The formation for polyphase structure and impact abrasion resistance behavior of austenite-bainite steel with nodular eutectics(ABNE steel) modified by Mg-Ce-Al have been investigated by TEM, SEM, EPMA and MDL wear tester. Results show that the bainite does not contain carbide, and its morphology is martensite-like 'N' type, crossed and regular triangular. The nodular eutectic is pseudo-eutectic of austenite and (Fe, Mn)3C. ABNE steel has higher wear resistance than austenite-bainite steel, austenite-bainite ductile cast iron and medium manganese steel with nodular carbides Under low and medium impact working condition, because the nodular eutectics effectively alleviate the intruding of abrasives into wear surface and microcutting of abrasives, the formation of a large number of nano-sized grains and amorphous structure in the wear surface layer, and large quantities of dislocation, strain martensite and deformed bainite structure in the subsurface layer.