铁道建筑技术
鐵道建築技術
철도건축기술
RAILWAY CONSTRUCTION TECHNOLOGY
2012年
10期
37-40
,共4页
钢轨%感应热处理%布氏硬度%试验研究
鋼軌%感應熱處理%佈氏硬度%試驗研究
강궤%감응열처리%포씨경도%시험연구
rail%induction heat treatment%Brinell hardness%experimental study
通过对基材及感应热处理后的60D40钢轨轨顶面表面布氏硬度、脱碳层深度、金相组织等项目试验检测,对比实验室布氏硬度计与便携式里氏硬度计测试的钢轨轨顶面表面布氏硬度值。从硬度计的检测原理、实际使用条件及金相组织着手分析布氏硬度值差异。试验结果表明,感应热处理表面硬度试样轨顶面磨削0.1 mm后便携式硬度计测得值比实验室台式布氏硬度计少21 HBW,轨顶面磨削0.2 mm、0.3 mm、0.4 mm、0.5 mm与1 mm台式硬度计测得值高于便携式硬度计10 HBW;轨头不同磨削量纵向金相组织与横断面脱碳层深度存在差异。
通過對基材及感應熱處理後的60D40鋼軌軌頂麵錶麵佈氏硬度、脫碳層深度、金相組織等項目試驗檢測,對比實驗室佈氏硬度計與便攜式裏氏硬度計測試的鋼軌軌頂麵錶麵佈氏硬度值。從硬度計的檢測原理、實際使用條件及金相組織著手分析佈氏硬度值差異。試驗結果錶明,感應熱處理錶麵硬度試樣軌頂麵磨削0.1 mm後便攜式硬度計測得值比實驗室檯式佈氏硬度計少21 HBW,軌頂麵磨削0.2 mm、0.3 mm、0.4 mm、0.5 mm與1 mm檯式硬度計測得值高于便攜式硬度計10 HBW;軌頭不同磨削量縱嚮金相組織與橫斷麵脫碳層深度存在差異。
통과대기재급감응열처리후적60D40강궤궤정면표면포씨경도、탈탄층심도、금상조직등항목시험검측,대비실험실포씨경도계여편휴식리씨경도계측시적강궤궤정면표면포씨경도치。종경도계적검측원리、실제사용조건급금상조직착수분석포씨경도치차이。시험결과표명,감응열처리표면경도시양궤정면마삭0.1 mm후편휴식경도계측득치비실험실태식포씨경도계소21 HBW,궤정면마삭0.2 mm、0.3 mm、0.4 mm、0.5 mm여1 mm태식경도계측득치고우편휴식경도계10 HBW;궤두불동마삭량종향금상조직여횡단면탈탄층심도존재차이。
The base material and the post-induction heat treatment 60D40 rail surface brinell hardness of the rail top,depth of decarburization,metallographic structure and other items are detected.The brinell hardness value of rail top measured by portable hardness tester is contrasted with that measured by laboratory brinell hardness tester.Brinell hardness value differences are to be found out from the detection principle of hardness tester,actual service conditions and metallographic structure.Test results show that the sample hardness value measured by portable hardness tester is 21 HBW less than that of laboratory desktop brinell hardness meter,when the rail top surface is ground by 0.1 mm.When the rail top is separately ground by 0.2 mm,0.3 mm,0.4 mm,0.5 mm and 1 mm,the values measured by desktop hardness are 10 HBW higher than the portable hardness tester;differences exist in longitudinal metallographic structure and cross-sectional depth of decarburization.
