US4885133A
Expired / Lapsed
US
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Wear-resistant sintered iron-based alloy and process for producing the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1989-04-06
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Granted: 1989-12-05
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Expires: 2009-04-06
Abstract
Abstract A wear-resistant sintered iron-based alloy and a process for producing the alloy are described, wherein the alloy comprises a first phase having a martensite composition which comprises from 0.5 to 3.0 wt % of Cr, from 0.4 to 1.0 wt % of Mn, from 0.1 to 0.4 wt % of Mo, and the balance of Fe, based on the total amount of said first phase; a second phase having a martensite and Cr carbide composition which comprises from 10 to 20 wt % of Cr and the balance of Fe, based on the total amount of said second phase; and from 1.0 to 2.5 wt % of C, based on the total amount of said alloy; wherein said first phase and said second phase are present as a mixture containing from 10 to 80% by volume of said second phase, based on the total volume of said alloy; and said alloy is substantially free from any residual austenite.
Inventors
- 👤 Satoshi Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:39
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; C22C33/0207
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
189 words
A process for producing a wear-resistant sintered iron-based alloy comprising the steps of mixing a powder mixture comprising (1) from 10 to 80 wt % based on the total amount of said powder mixture of an alloy powder comprising from 10 to 20 wt % of Cr and the balance of Fe, based on said alloy powder; (2) from 1.0 to 2.5 wt % based on the total amount of said powder mixture of carbon powder; and (3) the balance based on the total amount of said powder mixture of alloy powder or mixed powder comprising from 0.5 to 3.0 wt % of Cr, from 0.4 to 1.0 wt % of Mn, from 0.1 to 0.4 wt % of Mo, and the balance of Fe, based on the total amount of said alloy powder or mixed powder; compressing and molding said powder mixture thus obtained; sintering the molded mixture at a temperature of from 1,100° to 1,250° C. under vacuum or under an inert gas atmosphere; cooling to room temperature; heating again to a temperature of from 82° to 950° C. the sintered product; quenching; and tempering the same.
Claim 2
Dependent Claim
189 words
A process for producing a wear-resistant sintered iron-based alloy comprising the steps of mixing a powder mixture comprising (1) from 10 to 80 wt % based on the total amount of said powder mixture of an alloy powder comprising from 10 to 20 wt % of Cr and the balance of Fe, based on said alloy powder; (2) from 1.0 to 2.5 wt % based on the total amount of said powder mixture of carbon powder; and (3) the balance based on the total amount of said powder mixture of alloy powder or mixed powder comprising from 0.5 to 3.0 wt % of Cr, from 0.4 to 1.0 wt % of Mn, from 0.1 to 0.4 wt % of Mo, and the balance of Fe, based on the total amount of said alloy powder or mixed powder; compressing and molding said powder mixture thus obtained; sintering the molded mixture at a temperature of from 1,100° to 1,250° C. under vacuum or under an inert gas atmosphere; cooling to room temperature; heating again to a temperature of from 82° to 950° C. the sintered product; quenching; and tempering the same.
Claim 3
Dependent Claim
45 words
A process for producing a wear-resistant sintered iron-based alloy as in claim 1, wherein said powder mixture further comprises from 0.3 to 3.0 wt % based on the total amount of said powder mixture of at least one metal powders of W, V, and Nb.
Claim 4
Dependent Claim
43 words
A process for producing a wear-resistant sintered iron-based alloy as in claim 1, wherein said process further comprises maintaining the sintered product at a temperature of from 820° to 950° C. for about 60 minutes after said heating step before said quenching step.
Claim 5
Dependent Claim
30 words
A process or producing a wear-resistant sintered iron-based alloy as in claim 1, wherein said tempering step is performed by reheating to a temperature of from 180° to 450° C.
References Cited (Backward Citations)
US4561889A
Cited
US4556533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |