Methods of fabricating cutting elements for earth-boring tools and methods of selectively removing a portion of a cutting element of an earth-boring tool
Cutting elements for use with earth-boring tools include a cutting table having at least two sections where a boundary between the at least two sections is at least partially defined by a discontinuity formed in the cutting table. Earth-boring tools including a tool body and a plurality of cutting elements carried by the tool body. The cutting elements include a cutting table secured to a substrate. The cutting table includes a plurality of adjacent sections, each having a discrete cutting edge where at least one section is configured to be selectively detached from the substrate in order to substantially expose a cutting edge of an adjacent section. Methods for fabricating cutting elements for use with an earth-boring tool including forming a cutting table comprising a plurality of adjacent sections.
1. A method of selectively removing a portion of a cutting element of an earth-boring tool, the method comprising:
engaging a formation with a cutting surface of a first section of a cutting table of a cutting element;
detaching the first section of the cutting table as a substantial whole responsive to a mechanism other than wear at a discontinuity formed in the cutting table to at least partially expose a cutting surface of a second section of the cutting table adjacent to the first section; and
engaging the formation with the cutting surface of the second section of the cutting table.
2. The method of claim 1 , wherein detaching the first section of the cutting table at a discontinuity formed in the cutting table comprises detaching the first section of the cutting table at the discontinuity extending from a first portion of a peripheral edge of the cutting table to a second, opposing portion of the peripheral edge of the cutting table.
3. The method of claim 1 , wherein detaching the first section of the cutting table at a discontinuity formed in the cutting table comprises detaching the first section of the cutting table responsive to a mechanism other than wear.
4. The method of claim 1 , further comprising:
detaching the second section of the cutting table at another discontinuity formed in the cutting table to at least partially expose a cutting surface of a third section of the cutting table adjacent to the second section; and
engaging the formation with the cutting surface of the third section of the cutting table.
5. The method of claim 1 , wherein detaching the first section of the cutting table comprises removing the first section from a substrate to which the first section was attached.
6. The method of claim 5 , further comprising separating the first section from the second section at at least one protrusion of the substrate extending into a portion of the cutting table extending between the first section and the second section.
7. The method of claim 1 , further comprising separating the first section from the second section at a recess extending between the first section and the second section.
8. The method of claim 1 , further comprising separating the first section from the second section at at least one variation in a property of material forming the cutting table positioned between the first section and the second section.
9. The method of claim 1 , wherein engaging the formation with the cutting surface of the first section of the cutting table of the cutting element comprises contacting the formation with a leading portion of an elongated cutting surface of the cutting table.
10. A method of selectively removing a portion of a cutting element of an earth-boring tool, the method comprising:
engaging a formation with a cutting table comprising a plurality of adjacent sections attached to a substrate;
separating a leading section of the plurality of adjacent sections from the substrate at at least one discontinuity in the cutting table extending across the cutting table defining the plurality of adjacent sections; and
exposing a leading edge of a trailing section of the plurality of adjacent sections upon detachment of the leading section.
11. The method of claim 10 , further comprising splitting the leading section from the trailing section at the at least one discontinuity that extends from a first peripheral side of the cutting table to a second, opposing peripheral side of the cutting table.
12. The method of claim 10 , further comprising detaching the leading section of the cutting table from a substrate along an interface between the cutting table and the substrate.
13. The method of claim 12 , further comprising detaching the leading section of the cutting table from a substrate along at least one discontinuity at the interface between the cutting table and the substrate, the at least one discontinuity comprising at least one of at least one protrusion of the substrate extending into a portion of the cutting table, at least one recess formed in the cutting table at the interface between the cutting table and the substrate, and at least one variation in a property of material forming the cutting table at the interface between the cutting table and the substrate.
14. The method of claim 10 , further comprising splitting the leading section from the trailing section at a recess in the cutting table extending across a cutting surface of the cutting table.
15. The method of claim 10 , further comprising detaching the leading section as a substantial whole responsive to a mechanism other than wear during a downhole operation.
16. The method of claim 10 , further comprising detaching the leading section while remaining sections of the plurality of adjacent sections remain intact.
17. A method of selectively removing a portion of a cutting element of an earth-boring tool, the method comprising:
engaging a formation with a cutting surface of a first section of a cutting table of a cutting element; and
detaching the first section of the cutting table as a substantial whole during a downhole operation to at least partially expose a cutting surface of a second section of the cutting table adjacent to the first section.
18. The method of claim 17 , further comprising engaging the formation with the cutting surface of the second section of the cutting table.
19. The method of claim 17 , further comprising detaching the first section of the cutting table while the remaining sections of the cutting table remain intact.
20. The method of claim 17 , further comprising detaching the first section of the cutting table responsive to a mechanism other than wear.