中文摘要：

采用销盘式磨损试验机,对H13钢在室温、200和400℃和不同载荷条件下进行干滑动磨损试验,研究了钢的磨损行为及磨损机制.结果表明：在室温至400℃之间,200℃时钢的磨损率最低,其次为室温下的磨损率,400℃时磨损率最高.室温下钢的磨损率随载荷的提高而增加,磨损表面氧化物较少,其磨损机制主要为黏着磨损;200℃时的磨损行为极为特殊,随载荷从50增至100 N时,磨损表面出现较厚的氧化物层,故磨损率降低,载荷从100增至200 N时磨损率略提高,且显著低于室温和400℃时的磨损率,呈轻微氧化磨损特征.当环境温度达到400℃时,虽然磨损表面发生了明显的氧化,但随载荷的提高,导致基体塑性变形和热软化,导致磨损表面氧化物层剥落量增大,磨损率提高;当载荷超过150 N后材料的磨损机制由轻微氧化磨损转变为氧化磨损和塑性挤出磨损,磨损率迅速提高,为严重磨损.

英文摘要：

Dry sliding wear tests were performed for a H13 steel at room temperature（RT）,200 and 400 ℃ as well as various loads on a pin-on-disk wear tester.The wear behavior and mechanisms under various testing conditions were studied.The results showed that the wear rate of H13 steel increased in a sequence of 200 ℃,RT,400 ℃.At room temperature,wear rate increased with the increasing load and adhesive wear prevailed due to inadequate tribo-oxide on the worn surface.At 200 ℃,increasing load from 50 to 100 N reduced the wear rate due to the formation of tribo-oxide layer on worn surfaces.As the load increased from 100 to 200 N,wear rate slightly increased,and was substantially lower than that at RT and 400 ℃.In this case,mild oxidative wear prevailed.At 400 ℃,the wear rate increased with the increasing load.This is the result of load induced plastic deformation or/and thermal softening,and delamination.At a load higher than 150 N,the wear rate of H13 steel rapidly increased and severe wear occurred.The wear mechanism was oxidative wear and plastic extrusion.