gdl审审4工具钢加工性能的初步研究-preliminary study on processing performance of tool steel 4 by gdl.docx

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gdl审审4工具钢加工性能的初步研究-preliminary study on processing performance of tool steel 4 by gdl.docx

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gdl审审4工具钢加工性能的初步研究-preliminary study on processing performance of tool steel 4 by gdl

which include two aspects: (1) The effect of thermal capacity on the cutting temperature. The atoms with large radius soluted in the GDL-4 made the thermal capacity decrease. So when the material absorbed the same heat quantity, the temperature increased higher with lower thermal capacity.(2) The effect of thermal conductivity on the cutting temperature. The heat quantity was hard to emanate with lower thermal conductivity, which induced the heat quantity accumulated. The cutting temperature was higher with lower thermal capacity and thermal conductivity.Thirdly, the efffect of carbides on the cutting temperature. (1) The fracture toughness property of the carbides in GDL-4 was not as good as M2, when the carbides was concidered as the origin of crack, it’s propitious to cut. But the cutter wear seriously when carbides failed. (2) The difference of the hardness of carbides between GDL-4 and M2 was small, so the hardness of carbides was not the main factor affecting machinability.Key Words:machinabilitymechanical propertywork hardeningMFP of dislocations thermal property目录第一章序言..................................................................................................................................... 11.1 高速钢发展现状................................................................................................................ 11.1.1 低合金高速钢的合金化.......................................................................................... 11.1.2 新型低合金高速钢.................................................................................................. 21.2 GDL-4 新材料的开发41.3 GDL-4 成分的改变及其力学性能61.4 选题背景及意义.............................................................................................................. 111.4.1 选题背景................................................................................................................ 111.4.2 选题意义............................................................................................................... 15 第二章