Plasma anodic nitriding surface strengthening process for duplex stainless steel

Abstract

The invention discloses a duplex stainless steel plasma anode nitriding surface strengthening technology. The duplex stainless steel plasma anode nitriding surface strengthening technology comprises the following steps that (1) duplex stainless steel surface pretreatment is carried out; (2) plasma auxiliary anode nitriding is carried out, wherein a plasma auxiliary anode nitriding technology is adopted for conducting surface modification and strengthening processing on ultra-low carbon duplex stainless steel discs, and duplex stainless steel obtained after surface pretreatment is placed into an anode nitriding device for nitriding treatment; and (3) annealing is carried out. By means of the duplex stainless steel plasma anode nitriding surface strengthening technology, formation of a brittle phase can be effectively restrained, the discs have the excellent toughness matching from the surface layers to the center parts, workpiece secondary deformation caused by temperature gradient is reduced as many as possible on the basis of guaranteeing the excellent texture uniformity and mechanical property, coarsening damage caused by arc striking, edge effects and the like on treated surfaces can be avoided, meanwhile, formation of the white and bright semi-stable state compound S phase is better achieved, separation of brittle phases such as epsilon-Fe2-3N and gamma'-Fe4N is restrained,and the discs have the higher hardness, abrasion resistance and erosion resistance.

Description

technical field [0001] The invention relates to a metal surface strengthening technology, in particular to a dual-phase stainless steel plasma anode nitriding surface strengthening technology, which uses plasma-assisted anode nitriding technology to perform surface modification and strengthening treatment on ultra-low carbon duplex stainless steel discs . Background technique [0002] At present, the domestic starch separator is a nozzle continuous discharge type disc separator, which is mainly used for starch refining, pre-concentration, protein separation and starch recovery in the starch industry, and can also be used in food, medicine, dyeing, environmental protection and other departments. Processes such as liquid-solid two-phase separation, concentration recovery and clarification, such as kaolin, pulp recovery, wastewater treatment, etc. The manufacturing time of disc starch separator in our country is relatively short, and its main technology has been digested and a...

AI Technical Summary

Problems solved by technology

At present, the drum assembly of the disc starch separator manufactured in my country is composed of multiple parts, and the internal structure is complicated. Not only is the assembly cumbersome, but also the feeding system is easy to block. The equipment must be stopped to clean the drum after ten days of operation, and three-phase separation cannot be achieved. , which greatly reduces the working efficiency of the equipment

Western developed countries have done early research in the field of solid-liquid separation, and the current technology is relatively comprehensive and complete, and there are a large number of commercial application examples, but the products of these companies are extremely expensive, and equipment maintenance is troublesome and relatively expensive.