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Long-life steam turbine blade and production process thereof

A steam turbine blade and production process technology, which is applied in the direction of blade support components, mechanical equipment, manufacturing tools, etc., can solve the problems of rotor imbalance, blade failure and fracture, and failure to work, so as to prevent early brittle cracking and improve impact toughness , the effect of uniform organization

Active Publication Date: 2014-09-17
南京赛达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly manifested in the tensile stress caused by the centrifugal force acting on the blade when the rotor rotates, the bending stress and torsion force generated by the steam flow, and the alternating stress of forced vibration generated by the excited vibration force of the blade. All these harsh working environments, All will cause the blades to fail and break. After a single blade breaks, its fragments can damage the adjacent or next-level blades, making the rotor out of balance and unable to work.

Method used

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  • Long-life steam turbine blade and production process thereof
  • Long-life steam turbine blade and production process thereof
  • Long-life steam turbine blade and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a long-life steam turbine blade, the mass percentage of its chemical composition is: C: 0.29%, Si: 0.16%, Mn: 0.75%, Ni: 0.73%, Cr: 9.5%, Mo: 0.55%, V : 0.11%, Sr: 0.82%, Nb: 0.17%, Sn: 0.15%, Cu: 0.02%, Ti: 0.13%, B: 0.06%, Ca: 0.01%, S: 0.03%, P: 0.01%, rare earth Metal: 0.16%, the balance is Fe; the chemical composition mass percentage of the rare earth metal is: cerium: 6%, praseodymium: 7%, neodymium: 10%, promethium: 10%, gadolinium: 6%, lutetium: 5% , dysprosium: 4%, terbium: 13%, and the balance is lanthanum.

[0051] The production process of the high-life steam turbine blade in this embodiment is carried out according to the following procedures: hot forging→annealing→blade mechanical processing→stress relief heat treatment→quenching and tempering heat treatment→cooling→surface strengthening heat treatment→physical and chemical inspection→ultrasonic flaw detection→clean packaging; :

[0052] The annealing process: after hot forging, ...

Embodiment 2

[0062] This embodiment provides a long-life steam turbine blade, the mass percent of its chemical composition is C: 0.31%, Si: 0.19%, Mn: 0.77%, Ni: 0.85%, Cr: 10.1%, Mo: 0.64%, Sn: 0.17%, V: 0.15%, Sr: 0.84%, Nb: 0.16%, Cu: 0.06%, Ti: 0.14%, B: 0.08%, Ca: 0.008%, S: 0.01%, P: 0.03%, rare earth metal : 0.18, the balance is Fe; the chemical composition mass percentage of the rare earth metal is: cerium: 8%, praseodymium: 8%, neodymium: 11%, promethium: 10%, gadolinium: 7%, lutetium: 6%, dysprosium : 6%, terbium: 14%, and the balance is lanthanum.

[0063] The production process of the high-life steam turbine blade in this embodiment is carried out according to the following procedures: hot forging→annealing→blade mechanical processing→stress relief heat treatment→quenching and tempering heat treatment→cooling→surface strengthening heat treatment→physical and chemical inspection→ultrasonic flaw detection→clean packaging; :

[0064] The annealing process: after hot forging, kee...

Embodiment 3

[0074] This embodiment provides a long-life steam turbine blade, the mass percentage of its chemical composition is: C: 0.31%, Si: 0.19%, Mn: 0.77%, Ni: 0.85%, Cr: 10.1%, Mo: 0.64%, Sn : 0.17%, V: 0.15%, Sr: 0.84%, Nb: 0.16%, Cu: 0.06%, Ti: 0.14%, B: 0.08%, Ca: 0.008%, S: 0.01%, P: 0.03%, rare earth Metal: 0.18, the balance is Fe; the chemical composition mass percentage of the rare earth metal is: cerium: 10%, praseodymium: 9%, neodymium: 12%, promethium: 11%, gadolinium: 8%, lutetium: 7%, Dysprosium: 8%, terbium: 15%, and the balance is lanthanum.

[0075] The production process of the high-life steam turbine blade in this embodiment is carried out according to the following procedures: hot forging→annealing→blade mechanical processing→stress relief heat treatment→quenching and tempering heat treatment→cooling→surface strengthening heat treatment→physical and chemical inspection→ultrasonic flaw detection→clean packaging; :

[0076] The annealing process: after hot forging,...

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Abstract

The invention discloses a long-life steam turbine blade. The long-life steam turbine blade consists of the following chemical components in percentage by weight: 0.29-0.31% of C, 0.16-0.19% of Si, 0.75-0.77% of Mn, 0.73-0.85% of Ni, 9.5-10.1% of Cr, 0.55-0.64% of Mo, 0.15-0.17% of Sn, 0.11-0.15% of V, 0.82-0.84% of Sr, 0.15-0.17% of Nb, 0.02%-0.03% of Cu, 0.13%-0.15% of T, 0.06-0.08% of B, not greater than 0.01% of Ca, not greater than 0.03% of S, not greater than 0.03% of P, 0.16%-0.18% of rear-earth metal, and the balance of Fe. The production process disclosed by the invention is carried out by hot-forging, annealing, blade mechanical machining, distressing thermal treatment, tempering thermal treatment, cooling, surface-enhanced thermal treatment, physical and chemical inspecting, ultrasonic-wave flaw detecting, and cleaning-packaging. The production process disclosed by the invention can greatly improve impact toughness of the blade, can improve water erosion resistance and corrosion resistance of the blade, and can prolong the service life of the blade.

Description

technical field [0001] The invention relates to a steam turbine blade and its production process, in particular to a high-life steam turbine blade and its production process. Background technique [0002] A steam turbine is a rotary power machine that converts the energy of steam into mechanical work, also known as a steam turbine. It is mainly used as a prime mover for power generation, and it can also directly drive various pumps, fans, compressors and ship propellers, etc. It can also use the steam exhaust or intermediate extraction of steam turbines to meet the heating needs of production and life. Steam turbines are mainly used in electric power industry, shipbuilding industry, cement, chemical industry, petroleum, metallurgy, heavy machinery and other fields. [0003] The steam turbine is a rotary fluid power machine, which directly transforms the thermal energy of steam or gas into mechanical energy, and the blade is the "heart" of the steam turbine, which is an extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54B23P15/02C21D9/00F01D5/28
Inventor 王河平孙彦颖李志伟周启东刘达宗国翼
Owner 南京赛达科技有限公司
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