Residual stress in WC-Co measured by neutron diffraction

Mari, Daniele; Krawitz, A.D.; Richardson, James W.; Benoît, W.

doi:10.1016/0921-5093(95)10147-0

Cited by 72 publications

(29 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It was determined that 50% of the radiation comes from the first 0.9 m and that 95% appears from a depth <3.9 m, which is very similar to that found by Krawitz [13]. It should be realised that this penetration depth is much less than the size of the WC grains in the materials used and that most of the reflected beam (68%) comes from the plastically deformed layer as denoted in Fig.…”

Section: (Z) = I 0 Esupporting

confidence: 79%

“…Most of the scientists found an increase in residual stress with a decrease in cobalt content or an increase in abrasive grit size. Only a few researchers pointed out that the penetration depth of Cu K␣ radiation in WC is very low compared to the average grain size for Cu K␣ radiation [13,16]. Here, we will show that the penetration depth becomes even more important when there is a deformed layer on top of the ground surface.…”

Section: Introductionmentioning

confidence: 52%

“…In the present study, the macroscopic residual stresses that are induced by the grinding process are measured. Stress relief by heat treatments was studied by Mari et al, [13] and Krawitz [11] using neutron diffraction. The increase in compressive residual stress after grinding was studied using XRD [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Stress relief by heat treatments was studied by Mari et al, [13] and Krawitz [11] using neutron diffraction. The increase in compressive residual stress after grinding was studied using XRD [12][13][14][15]. Most of the scientists found an increase in residual stress with a decrease in cobalt content or an increase in abrasive grit size.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Grinding of WC–Co hardmetals

Hegeman¹,

Hosson²

2001

Wear

163

View full text Add to dashboard Cite

Section: (Z) = I 0 Esupporting

confidence: 79%

Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Grinding of WC–Co hardmetals

Hegeman¹,

Hosson²

2001

Wear

163

View full text Add to dashboard Cite

“…The diffraction peaks from the cobalt-base binder phase are weak and broad due to its relatively low content that yield nonreliable stress measurements. In this regard, it should be noted that, according to literature [34][35][36], residual stress values in the range from -100 to -500…”

Section: Surface Integrity Assessmentmentioning

confidence: 91%

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Yang

Marro

Trifonov

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

Contact loading is a common service condition for coated hardmetal tools and components. Substrate grinding represents a key step within the manufacturing chain of these coated systems. Within this context, the influence of surface integrity changes caused by abrasive grinding of the hardmetal substrate, prior to coating, is evaluated with respect to contact damage resistance. Three different substrate surface finish conditions are studied: ground (G), mirror-like polished (P) and ground plus heat-treated (GTT). Tests are conducted by means of spherical indentation under increasing monotonic load and the contact damage resistance is assessed. Substrate grinding enhances resistance against both crack nucleation at the coating surface and subsequent propagation into the hardmetal substrate. Hence, crack emergence and damage evolution is effectively delayed for the coated G condition, as compared to the reference P one. The observed system response is discussed on the basis of the beneficial effects associated with compressive residual stresses remnant at the subsurface level after grinding, ion-etching, and coating. The influence of the stress state is further corroborated by a lower resistance against damage for the coated GTT specimens. Finally, it is proposed and preliminary validated that substrate grinding also enhances damage tolerance of the coated system when exposed to contact loads. M.P. Johansson-Jõesaar and L. LlanesDear Professor Matthews, Please find attached electronic files corresponding to our contribution on contact damage resistance of TiN-coated hardmetals: beneficial effects associated with substrate grinding, which we (all authors do agree to the submission of the manuscript) offer for publication in Surface and Coatings Technology.I hope it is found satisfactory. (Procedia CIRP, Volume 13, 2014, Pages 257-263).(Authors) R1 is right about connection between results published in our contribution to the 2nd CIRP Conference on Surface Integrity (reference [27] in the submitted manuscript) and those presented in this paper. However, the two papers are distinctly different and cover completely different research topics and contain different data. The former focuses on "ground hardmetals" and "flexural strength/fractography", whereas the current one deals with "coated hardmetals" and "contact damage". Hence, we find R1's comment regarding "similar results" inappropriate. (Authors) Co binder effects on residual stresses are not neglected, and our writing may be blamed for such misunderstanding. Residual stresses induced by grinding are "macrostresses" evaluated in the WC phase and assumed to be representative of the whole WC-Co composite. They are different from the "microstresses" (different for each individual phase) that arise due to the difference in thermal expansion between the binder and the carbide as the material cools from liquid-or solid-phase sintering. In cemented carbides with WC as the carbide, the WC is taken as a reliable reference phase because it remains stoichiometric...

show abstract

Thermal Cycling Behavior of Thin WC‐Co Sintered Pellets

2017

View full text Add to dashboard Cite

Hexagonal WC crystal phase, with a and c axis slightly larger than expected is obtained for thin sintered (at 1 400 ºC under vacuum) WC-20wt% Co samples having no extra carbon added. This effect can be associated with the elastoplastic hysteretic thermal expansion behavior detected in the thin disks and to the associated observed anisotropy showing a higher expansivity in the axial compared to the in-plane direction. By using a two phase model where the matrix is WC and the second phase is Co, it can be computed (from expansion data) that tensile forces are acting at room temperature in both directions for the examined specimen. By heating to about 50-80 ºC the strains/stresses become compressive as expected for WC-20wt% Co.

show abstract

Residual stress in WC-Co measured by neutron diffraction

Cited by 72 publications

References 14 publications

Grinding of WC–Co hardmetals

Grinding of WC–Co hardmetals

Contact damage resistance of TiN-coated hardmetals: Beneficial effects associated with substrate grinding

Thermal Cycling Behavior of Thin WC‐Co Sintered Pellets

Contact Info

Product

Resources

About