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Fracture Toughness and Fracture Surface Morphology of Cold ForgingDie steels

机译:冷锻模具钢的断裂韧性和断裂表面形态

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In this paper the emphasis is placed upon fracture toughness and fracture surfacernmorphology of cold forging die steels with Rockwell C scale hardness number of 52 to 68. Threernpoint bending fracture toughness tests were conducted by use of Charpy impact specimens withrnfatigue crack for ten kinds of cold forging die steel. The higher the hardness the lower the fracturerntoughness is. The fracture toughness and crack initiation energy are well correlated to hardness. ThernCharpy impact energy of 5mm Unotched specimen, 2.5mm saw cut specimen and 2.5mm saw cutrnspecimen with fatigue cracku0002 is also well correlated to hardness. Well defined stretched zone wasrnobserved between fatigue and unstable fracture surface of SKD61 steel with Rockwell C scalernhardness number with 52, ill defined stretched zone was observed on fracture surfaces of harder steelsrnsuch as cemented carbide. It can be concluded that the relation between stretched zone width andrnfracture toughness can be expressed as SZW(μm)=3.28(Kc/σy)1.24 for structural materials includingrncold forging die steels in the range of SZW between150μm and 0.5μm.
机译:本文着重于洛氏C级硬度为52至68的冷锻模具钢的断裂韧性和断裂表面形貌。使用夏普冲击试样和疲劳裂纹对十种冷锻件进行了三点弯曲断裂韧性测试。模具钢。硬度越高,断裂韧性越低。断裂韧性和裂纹萌生能与硬度具有良好的相关性。具有疲劳裂纹的5mm缺口试样,2.5mm锯切试样和2.5mm锯切试样的夏比冲击能也与硬度有很好的相关性。在劳氏硬度C值为52的SKD61钢的疲劳和不稳定断裂表面之间观察到界限分明的延伸区,在硬质合金(如硬质合金)的断裂面上观察到界限分明的延伸区。可以得出这样的结论:拉伸强度区域宽度与断裂韧性之间的关系可以表示为SZW(μm)= 3.28(Kc /σy)1.24,对于SZW在150μm和0.5μm之间的冷锻模具钢。

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