刹车条件对航空刹车副钢对偶组织的影响

来源期刊：中南大学学报(自然科学版)2001年第5期

论文作者：姚萍屏 熊翔 袁国洲 彭剑昕

文章页码：507 - 510

关键词：组织;粉末冶金;钢对偶;航空刹车副

Key words：microstructure; powder metallurgy; steel segment; airplane brake assembly

摘    要：欧美飞机常使用的粉末冶金航空刹车副选用粉末冶金刹车材料和钢对偶材料配对作为摩擦偶以达到制动目的,而钢对偶材料的组织在使用过程中的变化反映了航空刹车副所经历的刹车过程累计状况,并影响刹车副的正常制动性能.作者研究了正常着陆刹车、中止起飞、极限磨损状态中止起飞这3种刹车条件下,粉末冶金航空刹车副钢对偶材料30CrSiMoVA的组织变化情况,并初步比较了不同组织状况下刹车副的摩擦磨损性能.研究结果表明:在3种条件下,表面均形成了塑性变形区;在正常着陆条件下,内部组织由回火索氏体转变为板条状马氏体;而在中止起飞和极限磨损状态中止起飞条件下,钢对偶材料组织则发生更为显著的变化,体现在恢复性试验中,刹车压力需求明显增大.

Abstract: Powder metallurgy frictionmaterial and steel segment are often used in airplane brake assembly in America and Europe. The change of microstructure of steel segmentreflects the brake process that the brake assembly has endured. On the other hand, it will change the assembly′s normal brake characteristics. The changes under different brake conditions,such as normal landing, reject take-off and wear reject take-off, were studied in this paper, and the friction and wear characteristics of brake assembly after different tests were studied too. The results show that the microstructure after normal landing tests changes from sorbite to marlensile, and the microstructures after reject take-off and wear reject take-off tests are thick marlensile. The brake pressure of specimens after the later two tests increases in the recovery brakingtest.