Peening process for enhancing surface finish of a component
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C21D-007/06
B21C-037/30
출원번호
US-0702534
(2010-02-09)
등록번호
US-8468862
(2013-06-25)
발명자
/ 주소
Ganesh, Swami
출원인 / 주소
General Electric Company
대리인 / 주소
Cusick, Ernest G.
인용정보
피인용 횟수 :
1인용 특허 :
4
초록▼
A process for treating a surface of a component to improve its surface finish and induce residual compresses stresses in a near-surface region of the component. The process entails performing a first peening operation to form residual compressive stress layers in the near-surface region of the compo
A process for treating a surface of a component to improve its surface finish and induce residual compresses stresses in a near-surface region of the component. The process entails performing a first peening operation to form residual compressive stress layers in the near-surface region of the component, and then performing at least a second peening operation to cause surface smoothing of the surface of the component while retaining residual compressive stresses in the near-surface region of the component. The first peening operation comprises wet glass bead peening at a first intensity with a first glass bead media, and the second peening operation comprises wet glass bead peening at a second intensity with a second glass bead media, wherein the second intensity is lower than the first intensity and the second glass bead media is smaller than the first glass bead media.
대표청구항▼
1. A peening process for enhancing a surface finish of a component, the process comprising the steps of: performing a first peening operation to form residual compressive stress layers in a near-surface region of the component, the first peening operation comprising wet glass bead peening at a first
1. A peening process for enhancing a surface finish of a component, the process comprising the steps of: performing a first peening operation to form residual compressive stress layers in a near-surface region of the component, the first peening operation comprising wet glass bead peening at a first intensity with a first glass bead media; and thenperforming at least a second peening operation to cause surface smoothing of the surface of the component while retaining residual compressive stresses in the near-surface region of the component, the second peening operation comprising wet glass bead peening at a second intensity with a second glass bead media, wherein the second intensity is about one fourth to about one third of the first intensity and glass beads of the second glass bead media have diameters of about one fourth to about one third of the diameters of the first glass bead media. 2. The process according to claim 1, wherein glass beads of the first glass bead media have diameters of greater than 0.50 millimeter. 3. The process according to claim 1, wherein glass beads of the first glass bead media have diameters of greater than 0.50 millimeter to about 0.90 millimeter. 4. The process according to claim 1, wherein glass beads of the first glass bead media have diameters of about 0.60 to about 0.80 millimeter. 5. The process according to claim 1, wherein the first intensity of the first peening operation is about 7N to about 14N. 6. The process according to claim 1, wherein the first intensity of the first peening operation is about 9N to about 13N. 7. The process according to claim 1, wherein the first intensity of the first peening operation is about 10N to about 12N. 8. The process according to claim 1, wherein glass beads of the second glass bead media have diameters of about 0.15 millimeter to about 0.25 millimeter. 9. The process according to claim 1, wherein the second intensity of the second peening operation is less than 6N. 10. The process according to claim 1, wherein the second intensity of the second peening operation is about 2N to about 5N. 11. The process according to claim 1, wherein the surface finish of the surface of the component following the second peening operation is about one fourth to about one half the surface finish following the first peening operation. 12. The process according to claim 1, wherein the surface finish of the surface of the component following the first peening operation is about 1.8 to about 2.5 micrometer, and the surface finish following the second peening operation is about 0.5 to about 1.3 micrometer. 13. The process according to claim 1, wherein the surface finish of the surface of the component following the second peening operation is less than 0.9 micrometer. 14. The process according to claim 1, wherein the component is formed of a material chosen from the group consisting of steel alloys, titanium-based alloys and superalloys. 15. The process according to claim 1, wherein the component is an airfoil component of a turbomachine. 16. The process according to claim 15, wherein the airfoil component is chosen from the group consisting of gas turbine blades, steam turbine blades, and gas turbine engine blades and the surface of the component is an airfoil surface. 17. The process according to claim 1, wherein the first and second peening operations are the only peening operations performed on the component. 18. A peening process for enhancing a surface finish of an airfoil surface of a turbomachine component, the process comprising: performing a first peening operation to form residual compressive stress layers in a near-surface region of the component, the first peening operation comprising wet glass bead peening at an intensity of 7N to 14N with a first glass bead media consisting of glass beads having diameters of greater than 0.50 millimeter; and thenperforming a second peening operation to cause surface smoothing of the surface of the component while retaining residual compressive stresses in the near-surface region of the component, the second peening operation comprising wet glass bead peening at an intensity of about one fourth to about one third of the intensity of the first peening operation with a second glass bead media consisting of glass beads having diameters of about one fourth to about one third of the first glass bead media, the surface finish of the airfoil surface following the second peening operation being 0.9 micrometer or less.
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이 특허에 인용된 특허 (4)
Broderick,Thomas Froats; Woodfield,Andrew P., Fatigue-resistant components and method therefor.
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