大型硬质合金顶锤裂纹萌生及断裂行为研究  

Study of Crack Initiation and Fracture Behavior of Large Carbide Top Hammer

作　　者：张伟 高文博 谢敬佩[2] 石玉斌 张宝林 毛志平[2] ZHANG Wei;GAO Wenbo;XIE Jingpei;SHI Yubin;ZHANG Baolin;MAO Zhiping(College of Civil Engineering,1.Henan University of Science&Technology Luoyang 471023,China;Materials Science&Engineering School,1.Henan University of Science&Technology Luoyang 471023,China;Luoyang Jinlu Carbide Tools Co.,Luoyang 471023,China)

机构地区：[1]河南科技大学土木工程学院,河南洛阳471023 [2]河南科技大学材料科学与工程学院,河南洛阳471023 [3]洛阳金鹭硬质合金工具有限公司,河南洛阳471023

出　　处：《河南科技大学学报（自然科学版）》2023年第4期1-10,I0001,共11页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金河南省联合基金重点项目(U1604251);河南省科学技术厅郑洛新国家自主创新示范首批创新引领型产业集群专项(201200211000);河南省高等学校重点科研项目计划(21A430016)。

摘　　要：针对顶锤在长期加载卸载过程中,易出现裂锤、塌锤等导致结构失效的问题,以Ф240大型顶锤为研究对象,通过有限元软件计算分析超大型顶锤在工作过程中的敏感区域应力分布,并与同工况下小型顶锤的应力情况作对比研究,从应力方面对超大型顶锤易于破损的原因进行了分析。利用扫描电子显微镜进行元素面分布扫描分析,研究了破损顶锤的断口形貌和化学成分等。研究结果表明:顶锤斜面承受拉应力和剪切应力大于芯部,裂纹源易在斜面处产生,裂纹主要沿着WC/WC界面扩展,高压砧面由于温度高于斜面,其断口氧化和Co相析出堆积程度更高。In view of the problem that the top hammer was prone to structural failure caused by cracking hammer and collapse hammer during long-term loading and unloading,takingФ240 large top hammer as the research object,the stress distribution in sensitive areas of the super large top hammer in the working process was calculated and analyzed by finite element software.The stress situation of the small top hammer under the same working conditions was compared and studied,and the reasons for the super large top hammer easy to break were analyzed from the stress aspect.Then,the elemental mapping analysis was carried out by scanning electron microscopy,and the fracture morphology and chemical composition of the broken top hammer were studied.The results show that the tensile stress and shear stress of the top hammer slope are greater than those of the core,the crack source is easy to occur at the inclined surface,and the crack mainly extends along the WC/WC interface.The high pressure anvil has a higher degree of fracture oxidation and Co phase precipitation accumulation due to the temperature being higher than the slope.

关 键 词：顶锤 裂纹萌生 微观组织 失效分析 

分 类 号：TG135.5[一般工业技术—材料科学与工程]