Forgings

Thermal cycling, which refers to the repeated heating and cooling of materials during manufacturing processes, plays a significant role in hot forging operations. In these processes, materials are exposed to extreme temperature fluctuations, which can cause thermal stresses and contribute to material degradation over time.

Die forging and press forging are two fundamental metalworking processes used to shape metal into precise forms by applying high pressure. Die forging involves the use of a mold (die) that shapes the metal under high pressure, typically producing parts with superior strength, toughness, and dimensional accuracy.

This article introduces the key points of MC5D roll billet manufacturing technology. Through the reasonable application of forging process and high-temperature diffusion technology, the original segregation of roll billet is improved, liquid precipitation carbonization is eliminated, and the density of roll billet is increased to achieve high-quality roll billet quality requirements, while effectively reducing production costs..

The heat treatment process of forged steel cold rolling rolls mainly includes post forging heat treatment, overall quenching and tempering treatment of the roll, deep quenching and tempering treatment of the roll body. Some cold rolling work rolls also require deep cryogenic treatment to increase the depth of the quenching layer and reduce the residual austenite content. Among them, post forging heat treatment, as a heat treatment process for roll forging, includes forms such as normalizing and spheroidizing annealing, mainly used to improve the matrix structure, eliminate stress, and improve machining and cutting performance. The overall quenching and tempering treatment of the rolling mill includes quenching and high-temperature tempering. After quenching and tempering treatment, the rolling mill substrate has good strength, toughness, plasticity, and mechanical processing properties.

This article employs a two-step melting process to produce alloy ingots with varying carbon contents. Subsequently, through processes such as forging, solution treatment, testing, and analysis, target alloy forgings are fabricated. The results indicate that when the carbon content in the alloy falls within a specific range, the alloy exhibits both excellent corrosion resistance and superior high-temperature performance. The comprehensive performance of the product meets the requirements for use in China's aerospace, energy, nuclear reactor, and other fields.

Adopting appropriate forging processes can effectively adjust the ratio of α phase and γ phase in dual-phase steel forgings, thereby enhancing the mechanical properties and corrosion resistance of the forgings: (1) Heating the cold ingot of duplex stainless steel to 1160~1180℃ for cogging and elongation forging, and crushing the as-cast crystalline structure of duplex stainless steel can refine the grain size of the billet. Water cooling after forging effectively prevents the precipitation of harmful phases such as σ. (2) After the second heating forging process, the billet undergoes upsetting and drawing, leading to further grain refinement. Various casting defects diffuse at high temperatures, dispersing uniformly or being eliminated.