Whole process variable pressure controlled carburation method

Abstract

A carbonizing method with variable-pressure control in whole procedure for high carbonizing quality features that above the carbonizing furnace, the high-flow kerosene drip method is used to increase the positive pressure in furnace for generating high-activity high-carbon atmosphere and high furnace pressure, which can speed up the carbonizing on the surface of workpiece, and the furnace pressure can be regulated for controlling the carbonized depth, hardness and metallographic structure of workpiece.

Description

1. Technical field:

[0001] The invention belongs to a new heat treatment carburizing technology, and in particular relates to a carburizing method capable of ensuring rapid carburizing with high carburizing quality and a whole-process pressure change control. 2. Background technology:

[0002] Carburizing is a surface hardening technique widely used in industry. Carburizing is divided into gas carburizing, liquid carburizing and solid carburizing, among which gas carburizing has the advantages of controllable carbon potential, high productivity, good working conditions and direct quenching, and is widely used in carburizing industry. application. The carburized workpiece made of special carburized steel should meet the following technical requirements after carburizing: (1) The surface hardness should not be lower than HRC60. (2) The surface layer and the fracture at the center should be fine grained. (3) The microstructure of the carburized layer should be composed of fi...

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