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GH4738 alloy fine-grain blank manufacturing method for supercritical power station steam turbine blade

A steam turbine blade and supercritical technology, which is applied in the field of preparation of GH4738 alloy fine-grain blanks for supercritical power station steam turbine blades, can solve the problems of cracking of forgings, uneven temperature field, uneven distribution of grains, etc. Shape, high degree of macroscopic uniformity, and high degree of microstructure uniformity

Active Publication Date: 2015-12-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research is being carried out on the production of ultra-supercritical steam turbine blade materials in China. Technically, the ingot is used in the same way as the free forging on the fast forging machine to prepare the bar. Although the billet produced by this process has a relatively uniform grain size, However, in the subsequent forging process, it is easy to cause problems such as cracking of the forging, uneven distribution of grains, and substandard mechanical properties. This is due to the high degree of alloying of the GH4738 alloy, which makes it sensitive to deformation temperature and deformation rate. Uneven temperature field, inconsistent forging rate, etc., resulting in a large number of uneven microstructures in the prepared billet, and a substantial increase in development costs

Method used

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  • GH4738 alloy fine-grain blank manufacturing method for supercritical power station steam turbine blade
  • GH4738 alloy fine-grain blank manufacturing method for supercritical power station steam turbine blade
  • GH4738 alloy fine-grain blank manufacturing method for supercritical power station steam turbine blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a GH4738 alloy fine-grain billet for an ultra-supercritical power station steam turbine blade is as follows:

[0032] (1). Cover the GH4738 alloy ingot after homogenization treatment:

[0033] Put the homogenized Φ200mm ingot into the 08F steel ladle after blowing sand and coating the surface with glass lubricant, and form a prefabricated extrusion billet after welding;

[0034] (2). Prefabricated extrusion heating:

[0035] The prefabricated extruded billet is heated to 1060°C and held for 320 minutes, and the preformed billet heat preservation time is calculated according to the following formula:

[0036] t 保温时间 =D 预制坯直径 (200mm)×1.6min / mm=320min

[0037] In the formula: t 保温时间 = holding time of ingot, min; d 铸锭直径 = ingot diameter, mm;

[0038] (3) Mold heating:

[0039] Heat the mold to 500°C and keep it warm for 6 hours; and apply graphite lubricant evenly on the inner surface of the mold cavity before hot extrusion;

[0040](4) Put t...

Embodiment 2

[0043] A kind of GH4738 nickel-based superalloy large ingot type blanking method steps are as follows:

[0044] (1). Cover the GH4738 alloy ingot after homogenization treatment:

[0045] Put the homogenized Φ200mm ingot into the 08F steel ladle after blowing sand and coating the surface with glass lubricant, and form a prefabricated extrusion billet after welding;

[0046] (2). Prefabricated extrusion heating:

[0047] The prefabricated extruded billet is heated to 1090°C for heat preservation, and the heat preservation time of the preform is calculated according to the following formula:

[0048] t 保温时间 =D 预制坯直径 (200mm)×1.6min / mm=320min

[0049] In the formula: t 保温时间 = holding time of ingot, min; d 铸锭直径 = ingot diameter, mm;

[0050] (3) Mold heating:

[0051] Heat the mold to 500°C and keep it warm for 6 hours; and apply graphite lubricant evenly on the inner surface of the mold cavity before hot extrusion;

[0052] (4) Put the prefabricated extruded billet into th...

Embodiment 3

[0055] A method for preparing a GH4738 alloy fine-grain billet for an ultra-supercritical power station steam turbine blade is as follows:

[0056] (1). Cover the GH4738 alloy ingot after homogenization treatment:

[0057] Put the homogenized Φ200mm ingot into the 08F steel ladle after blowing sand and coating the surface with glass lubricant, and form a prefabricated extrusion billet after welding;

[0058] (2). Prefabricated extrusion heating:

[0059] The prefabricated extruded billet is heated to 1150°C for heat preservation, and the heat preservation time of the preform is calculated according to the following formula:

[0060] t 保温时间 =D 预制坯直径 ×1.6min / mm=320min

[0061] In the formula: t 保温时间 = holding time of ingot, min; d 铸锭直径 = ingot diameter, mm;

[0062] (3) Mold heating:

[0063] Heat the mold to 500°C and keep it warm for 6 hours; and apply graphite lubricant evenly on the inner surface of the mold cavity before hot extrusion;

[0064] (4) Put the prefabri...

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Abstract

The invention discloses a GH4738 alloy fine-grain blank manufacturing method for a supercritical power station steam turbine blade and aims at existing technical states that a temperature field and the deformation rate are difficult to meet high requirements of alloy deformation parameter sensitivity degree, and microstructures are low in homogenization degree in a process of blank manufacturing by hammer forging a GH4738 alloy ingot. According to the method, an extrusion method for blank manufacturing is used for replacing an original hammer forging manner for blank breakdown. The GH4738 alloy ingot is heated to the recrystallization temperature or more so as to be subjected to extrusion deformation; the moulding of the alloy ingot can be improved by using a three-direction pressure state in the extrusion deformation, so that the moulding deformation can be played to the greatest extent; the fine grain is improved by adopting the deformation with a large extrusion ratio; a coating and sleeving technology is used for reducing the temperature drop during transfer and extrusion deformation of the alloy, so that the extrusion ratio is controlled accurately; a temperature rising effect is adopted for enabling the alloy to be subjected to heat deformation in the appropriate temperature field all the time, so that alloy bars having the fine grain and the high microstructure homogenization degree are manufactured.

Description

technical field [0001] The invention relates to a hot-working blanking method for a nickel-based deformed superalloy in the metallurgical industry, in particular to a method for preparing a GH4738 alloy fine-grain billet for a supercritical power station steam turbine blade using a forging blanking method for a difficult-to-deform superalloy. Background technique [0002] The rapid development of China's economy and the continuous improvement of people's living standards require the continuous growth of power supply to meet its needs. To improve thermal efficiency and reduce CO 2 , SO X and NO X The country is vigorously developing ultra-supercritical units to achieve the goal of "high efficiency and low consumption". 12%Cr heat-resistant steel is often used as rotors and moving blades of steam turbines at all levels. Considering the long-term service of ultra-supercritical power plants, 12%Cr steel can no longer meet this strict requirement. In view of the good resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/16C22F1/10
CPCB21C23/16C22F1/10
Inventor 姚志浩于秋颖董建新张麦仓
Owner UNIV OF SCI & TECH BEIJING
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