Forging method of gh4169 alloy steel round bar
A technology of GH4169, 1.GH4169, applied in the field of forging processing of metal materials, can solve the problems of not involving the production process of GH4169 alloy steel, low yield of GH4169 alloy steel round bar, poor quality of forgings, etc., to increase shrinkage cavity welding High efficiency, good application value, and the effect of improving the quality of forgings
Active Publication Date: 2021-01-26
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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[0005] None of the above patent documents involves the production process of GH4169 alloy steel when forging and processing round bars. The yield of GH4169 alloy steel round bars is low, and the problem of poor forging quality has not been solved.
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] The present invention comprises the steps:
[0027] The round billet with an outer diameter of 350mm to 500mm is heated, and the overall temperature of the heated billet is required to be uniform, and the surface temperature and core temperature of the billet are controlled within 1090°C ± 20°C; Heating temperature and heating time are controlled. In addition, in order to ensure the quality of the finished forging, before forging heating, the billet quality inspection is required, and the metallurgical quality such as casting billet inclusions is required to be qualified, and the size of the loose shrinkage cavity defect is not greater than 15mm.
[0028] The above-mentioned heated slabs are taken out of the furnace for forging. The forging process is six times of forging with one heating, and the finished forging size is 150mm-240mm.
[0029] ...
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Abstract
The invention relates to a forging method of a GH4169 alloy steel round bar, belonging to the technical field of forging processing of metal materials. The invention reasonably controls the process parameters such as forging temperature, feeding speed, rotation angle, hammering frequency and the temperature difference between the surface and the core of the forging process, so as to reasonably control the axial tensile stress of the core of the forging during the forging process and increase the equivalent strain of the core. , Increase shrinkage cavity welding rate, reduce forging crack defects, and improve forging quality. At the same time, due to the increase of the equivalent strain of the core, the uniformity of the forging structure increases. It is verified by experiments that the present invention improves the pass rate of flaw detection of GH4169 alloy from 66.2% to 78.5% through the above-mentioned forging method, and reduces the difference of cross-sectional grain size from the original 3 grades to below 1.5 grades. The invention achieves the purpose of improving product quality through process parameter control without changing the forging ratio of passes and without extra cost, and has good application value.
Description
technical field [0001] The invention relates to a forging method of a GH4169 alloy steel round bar, belonging to the technical field of forging processing of metal materials. Background technique [0002] GH4169 alloy steel is a nickel-based deformed superalloy with strong corrosion resistance, which has good oxidation resistance, high strength toughness and good machinability. Widely used in aero-engines, extrusion dies, gas turbines and other fields. Because its application fields are relatively high-end, users have high requirements for product quality. Generally, the grain size difference is required to be within 2 levels, and there is zero tolerance for defects such as flaw detection cracks. GH4169 alloy steel, due to its high deformation resistance and high alloy composition content, is likely to cause large thermal stress and uneven microstructure transformation, resulting in a low yield of GH4169 alloy steel. [0003] Research on the forging quality of GH4169 allo...
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IPC IPC(8): B21J5/00B21J1/06
CPCB21J1/06B21J5/00
Inventor 刘序江李俊洪罗许肖强
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD