Forging method for improving grain size of 15-5PH stainless steel

Abstract

The invention relates to a forging method for improving the grain size of 15-5PH stainless steel. Conventional forging forming is conducted on a 15-5PH stainless steel blank, and thus the blank is close to the forming size; according to the part shape, the blank obtained after conventional forging forming is bent, the forging preheating temperature of the blank is 850 DEG C+ / -50 DEG C, the heatingcoefficient is 0.2-0.3 min / mm, the forging heating temperature is 1000 DEG C-1150 DEG C+ / -15 DEG C, the heating coefficient is 0.3-0.4 min / mm, after heat preservation is conducted to the set time, the blank is taken out of a furnace immediately to be bent on a flat die hammer, and meanwhile the temperature is controlled; and the bent blank is subjected to heat treatment. According to the forgingmethod, the bending procedure of the forging blank is arranged to be completed at the heating number of finish forging, the forging heating temperature is lowered, and thus the problem that during small-deformation finish forging of the 15-5PH stainless steel, grains are liable to grown up is solved. Through the forging method, the strength, plasticity and fracture toughness of a 15-5PH stainlesssteel forge piece can reach the expected requirement, and the structure reliability of a 15-5PH stainless steel component is improved.

Description

technical field [0001] The invention belongs to the field of material processing, in particular to a forging method for improving the grain size of 15-5PH stainless steel. Background technique [0002] 15-5PH is a martensitic, precipitation hardening, chrome-nickel-copper stainless steel with good surface smoothness and dimensional stability. Good processing technology, excellent mechanical properties, and general corrosion resistance. 15-5PH steel has the characteristics of high strength, good transverse toughness, simple heat treatment process, small deformation, and both performance and process performance. It has been widely used in key components such as aircraft, ships, and missile shells. With the rapid development of aviation technology, the proportion of steel used in aircraft is gradually decreasing. Therefore, high-strength steel is required to achieve weight loss in the structure of flying parts. In recent years, the localization process of some (ultra) high-str...

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Problems solved by technology

[0003] In view of the above-mentioned situation of the prior art, the purpose of the present invention is to provide a kind of forging method that improves the grain size of 15-5PH stainless steel, to solve the problem that the grain grows easily when forging 15-5PH stainless steel, thereby ensure the forging strength, improve Tissue Reliability of 15-5PH Stainless Steel Components

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