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A steam turbine blade capable of improving thermal cracking resistance and its production process

A steam turbine blade and production process technology, which is applied in the directions of blade supporting elements, mechanical equipment, engine elements, etc., to achieve the effect of improving impact toughness and weakening the segregation phenomenon of alloy elements

Active Publication Date: 2016-02-10
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

[0005] The technical problems to be solved by the present invention are: how to make the hardness of the blade reach 277-311HB, and the hardness will not be too high or too low; After mechanical processing, the internal stress of the blade is completely released to avoid deformation or cracks caused by subsequent high-temperature quenching and tempering heat treatment, thereby improving its high temperature and high pressure resistance; how to improve the water erosion resistance and corrosion resistance of the blade, thereby increasing the service life of the blade

Method used

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  • A steam turbine blade capable of improving thermal cracking resistance and its production process
  • A steam turbine blade capable of improving thermal cracking resistance and its production process
  • A steam turbine blade capable of improving thermal cracking resistance and its production process

Examples

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Effect test

Embodiment 1

[0062] This embodiment provides a steam turbine blade that can improve thermal cracking resistance, the mass percent of its chemical composition is: C: 0.31%, Si: 0.10%, Mn: 0.75%, Ni: 0.65%, Cr: 11.2%, Mo : 0.65%, V: 0.16%, Sr: 0.85%, Nb: 0.17%, Cu: 0.07%, Al: 0.27%, Ti: 0.13%, B: 0.06%, S: 0.02%, rare earth metal: 0.21%, The balance is Fe; the chemical composition mass percentage of rare earth metals is: cerium: 5%, praseodymium: 10%, neodymium: 10%, promethium: 5%, lutetium: 5%, europium: 5%, terbium: 13%, Holmium: 1%, Erbium: 6%, and the balance is lanthanum.

[0063]The production process of the steam turbine blade that can improve thermal cracking resistance in this embodiment is carried out according to the following procedures: hot forging → annealing → tempering → blade machining → stress relief heat treatment → quenching and tempering heat treatment → cooling → surface strengthening heat treatment → physical and chemical inspection →ultrasonic flaw detection→clean p...

Embodiment 2

[0075] This embodiment provides a steam turbine blade that can improve thermal cracking resistance, the mass percent of its chemical composition is: C: 0.32%, Si: 0.11%, Mn: 0.76%, Ni: 0.63%, Cr: 11.5%, Mo : 0.67%, V: 0.18%, Sr: 0.86%, Nb: 0.15%, Cu: 0.05%, Al: 0.28%, Ti: 0.15%, B: 0.07%, S: 0.02%, rare earth metal: 0.3%, The balance is Fe; the chemical composition mass percentage of rare earth metals is: cerium: 6%, praseodymium: 11%, neodymium: 11%, promethium: 6%, lutetium: 6%, europium: 6%, terbium: 14%, Holmium: 2%, Erbium: 8%, and the balance is lanthanum.

[0076] The production process of the steam turbine blade that can improve thermal cracking resistance in this embodiment is carried out according to the following procedures: hot forging → annealing → tempering → blade machining → stress relief heat treatment → quenching and tempering heat treatment → cooling → surface strengthening heat treatment → physical and chemical inspection →ultrasonic flaw detection→clean p...

Embodiment 3

[0089] This embodiment provides a steam turbine blade that can improve thermal cracking resistance, the mass percent of its chemical composition is: C: 0.35%, Si: 0.12%, Mn: 0.77%, Ni: 0.64%, Cr: 11.7%, Mo : 0.68%, V: 0.17%, Sr: 0.88%, Nb: 0.16%, Cu: 0.06%, Al: 0.29%, Ti: 0.14%, B: 0.08%, S: 0.01%, rare earth metal: 0.35%, The balance is Fe; wherein the chemical composition mass percentage of rare earth metals is: cerium: 7%, praseodymium: 12%, neodymium: 12%, promethium: 7%, lutetium: 7%, europium: 7%, terbium: 16%, Holmium: 3%, Erbium: 9%, and the balance is lanthanum.

[0090] The production process of the steam turbine blade that can improve thermal cracking resistance in this embodiment is carried out according to the following procedures: hot forging → annealing → tempering → blade machining → stress relief heat treatment → quenching and tempering heat treatment → cooling → surface strengthening heat treatment → physical and chemical inspection →ultrasonic flaw detectio...

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Abstract

The invention discloses a turbine blade capable of improving the thermal cracking resistance. The turbine blade comprises the following chemical components in percentage by mass: 0.31-0.35% of C, 0.10-0.12% of Si, 0.75-0.77% of Mn, 0.63-0.65% of Ni, 11.2-11.7% of Cr, 0.65-0.68% of Mo, 0.16-0.18% of V, 0.85-0.88% of Sr, 0.15-0.17% of Nb, 0.05-0.07% of Cu, 0.27-0.29% of Al, 0.13-0.15% of Ti, 0.06-0.08% of B, less than or equal to 0.02% of S, 0.21-0.35% of rare earth metal and the balance of Fe. By adopting the turbine blade, the impact toughness of a blade is greatly improved, the thermal cracking resistance of the blade is improved, and the service life of the blade is prolonged.

Description

technical field [0001] The invention relates to a steam turbine blade and a production process thereof, in particular to a steam turbine blade capable of improving thermal cracking resistance and a production process thereof. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54F01D5/28B23P15/02
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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