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MICROSTRUCTURE IN LASER FUSED HIGH SPEED STEEL W6Mo5Cr4V2(M2)

LIU Ning CUI Kun Huazhong University of Science and Technology , Wuhan.China DENG Zonggang Hefei University of Technology , Hefei , China CHENG Benpei KONG Jie Institute of Solid State Physics , Academia Sinica , Hefei , China Doctorate student , Department of Mechanical Engineering No.2 , Huazhong University of Science and Technology , Wuhan 430074 , China

金属学报(英文版)

Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2(M2)melt after laser fu-sion was found to be so fine as the ehill zone of a solidified ingot.When narrower chill zoneformed,the long columnar dendrites grow into the melt and then the fine equiaxed cellularstructure appears in upper melt region nearly surface.The substructure of cellular grains anddendrites was observed to consist of martensite and retained austenile,while the carbides asM_6C_■ Cr_7C_3 and MC distributed at their boundaries.It is believed that the highermicrohardness up to HV_(0.1)=865-960 of the laser fused structure of the alloy is due to the oc-currence of martensite.

关键词: High speed steel W6Mo5Cr4V2(M2) , null , null

PROPAGATION OF SHORT FATIGUE CRACKS IN STEEL 16Mn

WANG Weiming HUANG Yuhua XU Hao Northeast University of Technology.Shenyang , China Doctorate student , Post Box 175 , Northeast University of Technology , Shenyang 110006 , China

金属学报(英文版)

Small bar speeimens of steel 16Mn with blind-holes were fatigued under constant amplitude Ioadings on a rotathing bending fatigue machie.Short crack propagation emanating from the blind-holes was obtained.Based on the experimental results,an expression of average propa- gation rate of short cracks was proposed.Statistical behavior of short crack propagation was discussed and the evoluation of sutrface sizes of short cracks with fatigue cycle number was al- so given.

关键词: steel 16Mn , null , null , null

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