{"title":"Aspects of room temperature compression tests for WC/Co Hardmetals","authors":"","doi":"10.1016/j.ijrmhm.2024.106804","DOIUrl":null,"url":null,"abstract":"<div><p>Hard materials, particularly tooling compositions based on WC/Co structures, are predominantly designed for applications that take advantage of their extremely good properties in compression. There is a standard test method for obtaining compression properties (strength and ductility), ISO 4506:1979, but it is rather expensive to use, needing high capacity testing machines and, in some cases, quite complex testpieces to avoid problems with premature failure from parasitic tensile stresses at the platen/testpiece interface. Consequently, for the most part, the compressive properties of hardmetals are estimated through measurements of hardness; using techniques such as Rockwell (ISO 3738: parts 1–1982 and 2–1988) or Vickers (ISO 3878:1983). This paper discusses the correlation of hardness values with compression data and reviews the testing background, advantages and disadvantages of the test methods, together with comments on the underlying science and comparative studies by complementary researchers. The adoption of stiff compressive testing rigs at NPL for the measurement of almost 40 grades of hardmetals with a comprehensive spread of microstructures is used to comment on good testing practice.</p></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":null,"pages":null},"PeriodicalIF":4.2000,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Refractory Metals & Hard Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S026343682400252X","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Hard materials, particularly tooling compositions based on WC/Co structures, are predominantly designed for applications that take advantage of their extremely good properties in compression. There is a standard test method for obtaining compression properties (strength and ductility), ISO 4506:1979, but it is rather expensive to use, needing high capacity testing machines and, in some cases, quite complex testpieces to avoid problems with premature failure from parasitic tensile stresses at the platen/testpiece interface. Consequently, for the most part, the compressive properties of hardmetals are estimated through measurements of hardness; using techniques such as Rockwell (ISO 3738: parts 1–1982 and 2–1988) or Vickers (ISO 3878:1983). This paper discusses the correlation of hardness values with compression data and reviews the testing background, advantages and disadvantages of the test methods, together with comments on the underlying science and comparative studies by complementary researchers. The adoption of stiff compressive testing rigs at NPL for the measurement of almost 40 grades of hardmetals with a comprehensive spread of microstructures is used to comment on good testing practice.
期刊介绍:
The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.