Formation mechanisms of microstructure imperfections and their effects on strength in submicron cemented carbide
Source abstract
Abstract
Abstract The characteristics and formation mechanisms of microstructure imperfections in two sets of submicron WC–10wt.%Co cemented carbides, which are fabricated by vacuum and low-pressure sintering, respectively, are deeply analyzed. Main imperfections are pore-Co-pool in the vacuum-sintered samples. The number of pore-Co-pool is obviously reduced by low-pressure sintering, but many porous microstructures with poor-Co or Co-free are easily introduced; the impurity segregation is also easily formed. Transverse rupture strength (TRS) of samples is strongly affected by the characteristics and size of imperfections. Two linear relationships between TRS and pore size are experimentally established, and a critical pore size has been calculated to be 28.8 μm.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (24)
Show source-provided references
1. A contamination analysis of cemented carbide powder mix
2. Reasons of and countermeasures against pollution of cemented carbide during manufacturing
3. Quality control of sintered-carbide during production process
4. The strength of WC–Co cemented carbide in relation to structural defects10.2320/matertrans1960.16.353 ↗
5. On reasons of formation of macropores in cemented carbide
6. Cobalt pool and fracture of cemented carbide
7. William · 1936 · 344
8. Li · 1990 · 9
9. Formation of a structure in cobalt single crystals at the β→α transformation10.1134/S1028335809010066 ↗
10. Design of cobalt gradient via controlling carbon content and WC grain size in liquid-phase-sintered WC–Co composite10.1016/j.ijrmhm.2008.08.002 ↗
11. Study of cemented carbide with cobalt-phase gradient distribution
12. Effects of carburizing process on gradient structure and hardness of WC–Co gradient cemented carbides
13. General aspects and limits of conventional ultrafine WC powder manufacture and hard metal production10.1016/0263-4368(95)92674-9 ↗
14. Effect of grain motion on the coarsening of WC grains in the carbon-saturated liquid matrix during liquid phase sintering of WC–Co alloys10.1016/S1359-6462(98)00070-0 ↗
15. Formation of coarse grain structure in submicron grain cemented carbides
16. Application of rare earth elements in cemented carbide inserts, drawing dies and mining tools10.1016/0921-5093(96)10130-1 ↗
17. Research and development of rare-earth cemented carbides10.1016/S0263-4368(01)00018-X ↗
18. Strength improvement of cemented carbides by hot isostatic pressing (HIP)10.1007/BF00552908 ↗
19. Characteristics of flaws at fracture origins and fracture stress-flaw size relations in various ceramics10.1016/0025-5416(76)90147-6 ↗
20. Petch relation in single-phase oxide ceramics10.1111/j.1151-2916.1965.tb14676.x ↗
21. Strength/grain-size effects in ceramics
22. Effect of porosity and grain size on the mechanical properties of hot-pressed boron carbide10.1007/BF00791728 ↗
23. Mechanical properties of polycrystalline diamonds10.1179/mst.1988.4.11.949 ↗
24. Effect of size and location of spherical pores on transverse rupture strength of WC–Co cemented carbides10.1016/j.msea.2007.09.023 ↗