D2车轮钢原始组织对滑动磨损性能的影响

Influences of Microstructure on Sliding Wear Performance of D2 Wheel Steel

采用MRH-5A型环块磨损试验机对D2车轮钢及U71Mn钢轨钢采取对摩方式进行滑动磨损试验,研究原始组织对D2车轮钢滑动磨损性能的影响.结果表明:以回火索氏体(TS)为原始组织的D2车轮钢比片状珠光体组织(P)+先共析铁素体(F)的D2车轮钢具有更好的耐磨性能. P+F和TS表面磨损机制均以磨粒磨损和黏着磨损为主,而P+F表面磨损更严重且伴随大块白层剥落现象. TS塑性变形层更薄,其内的铁素体细化成纳米晶,粒状渗碳体不发生剪切变形,主要以溶解为主,不易形成较厚的白层,不发生大块剥落现象,提高耐磨性能.

MRH-5 A ring block wear tester was used to conduct sliding wear tests on D2 wheel steel and U71 Mn rail steel by means of pair-wear tests to study the effect of original structure of D2 wheel steel on its sliding wear performance.The results showed that D2 wheel steel with tempered sorbite(TS)had better wear resistance than D2 wheel steel with lamellar pearlite structure(P)+proeutectoid ferrite(F).The wear mechanisms of P+F and TS were mainly abrasive wear and adhesive wear,while the wear of P+F was more severe accompanied with the peeling of large white etching layers(WEL).For TS,the plastic deformation layer was thinner,and the ferrite was refined into nanocrystalline.No shear deformation occurred on the granular cementite but dissolution was mainly presented.Because a thicker WEL was unlikely to form and this prevented large peeling,and hence improved the wear resistance.