矿冶工程
礦冶工程
광야공정
Mining and Metallurgical Engineering
2015年
4期
115-118
,共4页
刘红梅%徐元彬%汪兴兴%吴成群%吕毅%倪红军
劉紅梅%徐元彬%汪興興%吳成群%呂毅%倪紅軍
류홍매%서원빈%왕흥흥%오성군%려의%예홍군
深冷处理%制砖模具芯杆%微观组织%力学性能
深冷處理%製磚模具芯桿%微觀組織%力學性能
심랭처리%제전모구심간%미관조직%역학성능
deep cryogenic treatment%brickmaking mold core rod%microstructure%mechanical property
为探究深冷处理对制砖模具芯杆使用寿命的影响,采用不同的深冷工艺对制砖模具芯杆(65Mn)进行了深冷处理。利用扫描电子显微镜、X射线衍射仪、硬度测试机及摩擦试验机对深冷前后芯杆微观组织结构、硬度与耐磨性进行了观察与测试。结果表明:采用合适的深冷工艺可有效提高芯杆的硬度和耐磨性。其中两次-180℃深冷处理2 h、200℃回火后效果最为明显,芯杆残留奥氏体含量降幅达到24.5%,硬度提高5.7HRC,摩擦因数下降55.2%。深冷过程中板条状马氏体转变为孪晶马氏体,且马氏体和托氏体组织会得到进一步细化,组织中有碳化物析出。
為探究深冷處理對製磚模具芯桿使用壽命的影響,採用不同的深冷工藝對製磚模具芯桿(65Mn)進行瞭深冷處理。利用掃描電子顯微鏡、X射線衍射儀、硬度測試機及摩抆試驗機對深冷前後芯桿微觀組織結構、硬度與耐磨性進行瞭觀察與測試。結果錶明:採用閤適的深冷工藝可有效提高芯桿的硬度和耐磨性。其中兩次-180℃深冷處理2 h、200℃迴火後效果最為明顯,芯桿殘留奧氏體含量降幅達到24.5%,硬度提高5.7HRC,摩抆因數下降55.2%。深冷過程中闆條狀馬氏體轉變為孿晶馬氏體,且馬氏體和託氏體組織會得到進一步細化,組織中有碳化物析齣。
위탐구심랭처리대제전모구심간사용수명적영향,채용불동적심랭공예대제전모구심간(65Mn)진행료심랭처리。이용소묘전자현미경、X사선연사의、경도측시궤급마찰시험궤대심랭전후심간미관조직결구、경도여내마성진행료관찰여측시。결과표명:채용합괄적심랭공예가유효제고심간적경도화내마성。기중량차-180℃심랭처리2 h、200℃회화후효과최위명현,심간잔류오씨체함량강폭체도24.5%,경도제고5.7HRC,마찰인수하강55.2%。심랭과정중판조상마씨체전변위련정마씨체,차마씨체화탁씨체조직회득도진일보세화,조직중유탄화물석출。
In order to explore the effects of deep cryogenic treatment on the service life of brick?making mold core rod, the brickmaking mold core rod (65Mn) was treated by using different cryogenic processes. The microstructure, hardness and wear resistance of the core rod before and after cryogenic treatment were observed and tested with scanning electron microscope, X?ray diffractometer, hardness testing machine and friction test machine. The results show that an appropriate cryogenic process can effectively improve the hardness and abrasion resistance of the core rod. Twice cryogenic treatment at -180 ℃ for 2 hrs followed by tempering at 200 ℃ brings significant effects, that is, retained austenite content and friction factor reduced by 24.5% and 55.2% respectively, and hardness increased by 5.7HRC. In the cryogenic process, the plate?strip?like martensite is transformed to twin martensite, furthermore, the martensite and troostite are further refined, with carbide precipitated.