CAJ | 학술논문

70Si3Mn钢是传统的弹簧钢，其常规热处理工艺是油淬后中温回火得到屈氏体组织。本文对70Si3Mn钢进行等温淬火处理获得无碳化物贝氏体组织，比较了其经不同温度等温淬火处理后的组织与力学性能，并对其耐磨性进行了研究。结果表明，70Si3Mn钢在Ms 以上10～30℃等温可得到无碳化物贝氏体组织，该组织由厚度为160 nm的贝氏体铁素体板条和残余奥氏体薄膜组成，它具有较高的强度和硬度、高的塑性和韧性等优异的综合力学性能，同时具有较好的耐磨性。
70Si3Mn강시전통적탄황강，기상규열처리공예시유쉬후중온회화득도굴씨체조직。본문대70Si3Mn강진행등온쉬화처리획득무탄화물패씨체조직，비교료기경불동온도등온쉬화처리후적조직여역학성능，병대기내마성진행료연구。결과표명，70Si3Mn강재Ms 이상10～30℃등온가득도무탄화물패씨체조직，해조직유후도위160 nm적패씨체철소체판조화잔여오씨체박막조성，타구유교고적강도화경도、고적소성화인성등우이적종합역학성능，동시구유교호적내마성。
The 70Si3Mn steel is one of the traditional spring steels to which conventional heat?treatment involves oil quenching and medium?temperature tempering to obtain the troostite microstructure.In this paper the 70Si3Mn steel was treated by austempering to obtain the carbide?free bainite microstructure.The microstructures and mechanical properties of the steel were investigated.The re?sults show that the carbide?free bainite microstructure could be formed in the 70Si3Mn steel by the austempering at a temperature range of Ms+10~30℃ which consists of a lath?like bainite ferrite with a average thickness of 160 nm and a film?like retained aus?tenite.Excellent mechanical properties are exhibited for the steel such as high strength and hardness high plasticity and toughness as well as good wear resistance.