Hittebehandeling normaliseringsproses

The normalizing process is a heat treatment process in which the steel is heated to 30-50°C above Ac3 (or Acm), and then cooled in still air after a suitable heat preservation time. The normalizing that heats the steel to 100-150 ℃ above Ac3 is called high-temperature normalizing.

Die hoofdoel van normalisering vir medium en lae koolstof staal gietstukke en smee is om die struktuur te verfyn. In vergelyking met uitgloeiing is die perlietlamelle en ferrietkorrels na normalisering fyner, dus is die sterkte en hardheid hoër.

Due to the low hardness of low carbon steel after annealing, the phenomenon of sticking to the knife occurs during cutting, and the cutting performance is poor. By increasing the hardness by normalizing, the cutting performance can be improved. Some medium carbon structural steel parts can be replaced by normalizing and tempering to simplify heat treatment. craft.

The hypereutectoid steel is normalized and heated by a knife above Acm, so that the cementite that was originally mesh is completely dissolved into the austenite, and then cooled at a faster rate to inhibit the precipitation of cementite at the austenite grain boundary, thereby It can eliminate network carbide and improve the structure of hypereutectoid steel.

Gelaste dele wat sweissterkte benodig, word genormaliseer om die sweisstruktuur te verbeter en sweissterkte te verseker.

Tydens die hittebehandelingsproses moet die herstelde dele genormaliseer word, en die strukturele dele wat meganiese prestasie-aanwysers benodig, moet genormaliseer word en dan geblus en getemper word om aan die meganiese werkverrigtingvereistes te voldoen. Na normalisering moet medium- en hoëlegeringsstaal en groot smeewerk teen hoë temperatuur getemper word om die interne spanning wat tydens normalisering gegenereer word, uit te skakel.

Sommige legeringstaal ondergaan gedeeltelike martensitiese transformasie tydens smee om harde strukture te vorm. Om hierdie soort slegte organisasie uit te skakel, wanneer normalisering aangeneem word, is die normaliseringstemperatuur ongeveer 20 ℃ hoër as normale normaliseringstemperatuur deur verhitting en hittebewaring.

Die normaliseringsproses is relatief eenvoudig, wat bevorderlik is vir normalisering met smee van afvalhitte, wat energie kan bespaar en die produksiesiklus kan verkort.

Improper normalizing process and operation also produce tissue defects. Similar to annealing, the remedy method is basically the same.