发明名称 |
High strength steam turbine rotor and methods of fabricating the rotor without increased stress corrosion cracking |
摘要 |
A heat treatment process is provided that produces a monoblock, low alloy steel rotor for use in low pressure steam turbines. The process includes austenitizing the rotor at a substantially uniformly applied treatment temperature of about 840° C., quenching the rotor, and then differentially tempering the rotor at different axial locations. The rotor is tempered in a furnace divided into regions by refractory boards enabling different temperatures in each divided region to be maintained. A higher than normal strength condition is achieved in one or more axial locations along the rotor by subjecting the location(s) to a lower tempering temperature. The axial location(s) being tempered at lower temperature approximate those locations less susceptible to stress corrosion cracking whereby increased strength is provided the rotor without increasing net susceptibility to stress corrosion cracking.
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申请公布号 |
US6344098(B1) |
申请公布日期 |
2002.02.05 |
申请号 |
US20000733642 |
申请日期 |
2000.12.08 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
MANNING MICHAEL PATRICK;SCHWANT ROBIN CARL |
分类号 |
F01D5/02;C21D9/00;C21D9/28;C21D9/38;C22C38/00;C22C38/44;C22C38/46;F01D5/28;(IPC1-7):C21D9/08 |
主分类号 |
F01D5/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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