Ultra-fine grain rolling method for large-size high-temperature alloy bar

A high-temperature alloy and ultra-fine-grained technology, applied in metal rolling, metal rolling, rolling, etc., can solve the problems of high forming load of HPT, lack of loading capacity, and difficulty in realizing industrialization requirements, etc., to improve surface quality and deformation The effect of uniformity, reducing the number of repeated rolling, and strengthening the effect of grain refinement

CN109772890AActive Publication Date: 2019-05-21重庆两航金属材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-05-21

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Abstract

The invention relates to the field of mechanical processing, in particular to an ultra-fine grain rolling method for a large-size high-temperature alloy bar. The ultra-fine grain rolling method comprises the following steps that rolling tool design is carried out and specifically comprises a roller design and a guide plate design, wherein each roller is set as a hyperboloid circular truncated cone-shaped roller, and specifically, the generatrix of each roller is formed by connecting two curves; and one side of each guide plate is set as a curved surface; a deformation region is constructed, wherein the curved surfaces of the two guide plates are oppositely arranged, the two rollers are arranged between the guide plates, and the region enclosed by the two guide plates and the two rollers isthe deformation region; a deformation region with equal ovality is constructed, wherein the ovality in the deformation region remains unchanged; and a rolling feeding mode is selected, wherein a reverse rolling mode is adopted. According to the ultra-fine grain rolling method for the large-size high-temperature alloy bar, by designing the hyperboloid circular truncated cone-shaped rollers and thecurved guide plates and constructing the deformation region with equal ovality, severe plastic deformation can be generated on the premise of remarkably inhibiting the Mannesmann effect at the center.
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Description

technical field

[0001] The invention relates to the field of mechanical processing, in particular to an ultra-fine-grain rolling method for large-size high-temperature alloy rods. Background technique

[0002] Ultrafine crystal / nanocrystalline materials and their preparation technology are one of the research hotspots in the field of material science. Research in this direction embodies people's efforts to continuously improve the strength and toughness of polycrystalline materials through continuous refinement of grains. Among them, the research results of severe plastic deformation (Severe Plastic Deformation, referred to as SPD) technology are eye-catching.

[0003] At present, the mainstream SPD process includes five methods: high pressure torsion (HPT), equal channel angular extrusion (ECAP), cumulative stack rolling (ARB), multidirectional forging (MF) and torsional extrusion (TE), among which:

[0004] (1) High-pressure torsional deformation: While loading a pressur...

Examples

Embodiment 1

[0070] Exemplary embodiments of the present invention will be described in detail below through specific examples. The following example takes the high-temperature alloy GH4169 rod with the specification of blank 3 as Φ84×400 as an example, however, the present invention is not limited thereto, and superalloy rods with other specifications can also be produced by the method of the present invention.

[0071] 1) Rolling tool design, specifically including roll 1 design and guide plate 2 design, roll 1 is set as hyperboloid truncated conical roll 1, specifically: the generatrix of roll 1 is formed by connecting two curves, such as figure 1 As shown, one of the curves is any curve between the curve m and the curve p, the connecting line between the two ends of the curve is the first middle line n, and the other curve is any curve between the curve q and the curve t, The connecting line between the two ends of the curve is the second center line s; one side of the guide plate 2 is...