|제목(국문)||계장화 샬피충격시험을 이용한 WC-Co 초경합금의 동적 균열개시인성치 결정|
|제목(영문)||Determination of Dynamic Crack Initiation Toughness Using Instrumented Charpy Impact Test in WC-Co Alloy|
박원구 (W.K.Park ,인하대학교 대학원 금속공학과 ) ▷공저자네트워크등록하기
황선근 (S.K.Hwang ,인하대학교 대학원 금속공학과 ) ▷공저자네트워크등록하기
홍성경 (S.K.Hong ,인하대학교 대학원 기계공학과 ) ▷공저자네트워크등록하기
윤경수 (K.S.Yoon ,인하대학교 대학원 기계공학과 ) ▷공저자네트워크등록하기
|초록||Cemented carbides, best known for their superior mechanical properties such as high strength, high hardness and high wear resistance, have a wide range of industrial applications including metal working tools, mining tools, and wear resistance components. The cobalt has been used as a binder in the WC-based hard composites due to its outstanding wetting and adhesion characteristics even though its expensiveness. Therefore many studies attempted to find a better substitute for cobalt as binder to decrease production costs. This investigation is a pre-step to study dynamic fracture characteristic evaluation of a WC-NI hardmetal in which Nickel was used as a binder. In this study, the dynamic crack initiation toughness and some of the dynamic fracturing characteristics of commercially used WC-CO hardmetal were evaluated by using the instrumented Charpy impact testing procedures. It was found that the dynamic characteristics of used strain amplifier were very important experimental factors to extract valid dynamic fracturing data in WC-CO specimens. It was suggested by showing some experimental examples that when we wished to evaluate dynamic fracture toughness for cemented carbide composites by using the instrumented Charpy impact testing procedure, a careful attention must be given to obtain valid results.
|keyword||Dynamic Crack Initiation Toughness(동적 균열개시인성치), Instrumented Charpy Impact Test (계장화 샬피충격시험), Strain Gage(스트레인게이지), Wheatstone Bridge(휘스톤브리지), Static Calibration(정적보정), Compliance(컴플라이언스)|