Production method of fine-grain high-strength GH4169 alloy by hot rolling

A technology of GH4169 and production method, which is applied in the field of hot rolling production of fine-grained high-strength superalloys, can solve the problems of unstable quality, low production efficiency, grain growth, etc., and achieves significant economic benefits, production cycle reduction, strength improved effect

Inactive Publication Date: 2013-07-31
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the production conditions of traditional tandem mills, grain refinement is mainly achieved through low-temperature rolling and second-phase constrained grain growth, and its main characteristics are low yield, low production efficiency, and unstable quality (Zhuang Jingyun, Du Jinhui, Deng Qun, Qu Jinglong, Lu Xudong. Deformed superalloy GH4169. Beijing: Metallurgical Industry Press, 2006.)
The production rate and production efficiency of the alloy can be effectively improved by hot rolling production, but this production method must be completed at a higher temperature (1050-1100°C) to reduce the energy consumption of the tool
Hot continuous rolling of alloys at the above temperature must solve two problems: 1) Control reasonable heati

Method used

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  • Production method of fine-grain high-strength GH4169 alloy by hot rolling
  • Production method of fine-grain high-strength GH4169 alloy by hot rolling
  • Production method of fine-grain high-strength GH4169 alloy by hot rolling

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Experimental program
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Effect test

Embodiment 1

[0019] Taking the GH4169 round steel with a diameter of 23 mm as an example, the chemical composition of the alloy is shown in Table 1. The rough-rolled 80mm×80mm hot billet is subjected to temperature compensation heating at 1050±10°C×10min in a tunnel-type heating furnace. ·s -1 The entrance speed of the first stand enters the continuous rolling unit, and after 14 passes of continuous rolling, the grain size is as follows figure 1 It is about 13 μm, and after online solid solution + aging treatment, its performance is shown in Group 2 of Table 2. The data in Table 2 shows that the properties of GH4169 alloy rods in both air cooling (Group 1) and online solid solution cooling methods meet the standard "High-temperature Alloy Hot-Rolled Bars for Rotating Parts GB / T14993.1994". The tensile properties at room temperature, Brinell hardness and high temperature (650°C) tensile properties of the material in the online solid solution mode are significantly higher than the test resu...

Embodiment 2

[0025] Taking the GH4169 round steel with a diameter of 45 mm as an example, the chemical composition of the alloy is shown in Table 1. The rough-rolled 80mm×80mm hot billet is heated by temperature compensation at 1050±10℃×10min in a tunnel-type heating furnace. ·s -1 The entrance speed of the first stand enters the continuous rolling unit, and after 6 passes of continuous rolling, the grain size is as follows figure 2 It is about 11 μm, and its properties are shown in Table 3 after online solid solution + aging treatment. The indicators in Table 3 are close to the indicators in Group 2 in Table 2, indicating that the performance of the product can be effectively controlled by using this technology; at the same time, due to the further refinement of the grain size (13μm→11μm), its various strength indicators It is slightly higher than the second group index in Table 2, indicating that the microstructure and properties of the product can be effectively adjusted by changing t...

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Abstract

The invention discloses a production method of a fine-grain high-strength GH4169 alloy by hot rolling, belongs to the technical field of production techniques of high-temperature alloy rods for aerospace. According to the method, a roughly rolled blank is subjected to a conventional production process, including heating, rolling, cooling and the like, to produce the hot rolled rod of which the diameter is 20-45mm. The technical key is to implement grain refinement and grain size control by controlling the rolling speed of the continuous hot rolling set (controlling the dynamic and sub-dynamic recrystallization of the rolling process), and to shorten the alloy heating and holding time through an on-line solution treatment technique by inducing the second phase precipitation with deformation, thereby achieving the goals of inhibiting grain growth and solution strengthening. The method lowers the manufacturing cost of the high-temperature alloy hot rolled rod, enhances the strength indexes of the alloy, and provides a new technique for producing the hot rolled high-temperature alloy for aerospace.

Description

technical field [0001] The invention belongs to the field of preparation of alloy materials for aerospace, and in particular relates to a hot rolling production method of fine-grained high-strength superalloy. Background technique [0002] Superalloys are important structural materials in aviation, aerospace and other industries. Among the more than 100 high-temperature alloys that have been developed, GH4169 alloy is the most important deformed alloy (its composition is: Ni: 50-55%; Cr: 17-21%; Nb: 5-5.5%; Ti: 0.75 ~1.15%; Mo: 2.80~3.30%; Al: 0.30~0.70%; C: 0.02~0.06%; the rest is Fe). Since the alloy was successfully launched in 1959, after nearly 50 years of continuous improvement and development, it has become a nickel-based deformation alloy with the largest output and the widest use area, and higher requirements are put forward for the grain size and strength of the alloy. Require. Under the production conditions of traditional tandem mills, grain refinement is main...

Claims

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Application Information

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IPC IPC(8): C22F1/10
Inventor 隋凤利徐丽霞朱国辉陈其伟
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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