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Research draft

heat treatment

vr.tr.heat-treatment · ACT.ACT

Let an agent explain heat treatment processes and their effects on microstructure, relay process parameters and standards from metallurgical references, describe surface hardening methods, and distinguish heat treatment from hot working and thermal processing of non-metals.

Thing Registry Activities and processes

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain heat treatment processes and their effects on microstructure, relay process parameters and standards from metallurgical references, describe surface hardening methods, and distinguish heat treatment from hot working and thermal processing of non-metals.

A group of industrial processes that alter the physical and sometimes chemical properties of a material, usually a metal, by controlled heating and cooling, including annealing, normalising, hardening and quenching, tempering, and surface treatments such as carburizing, nitriding by gas or plasma, and nitrocarburizing including ferritic nitrocarburizing; heat treatment controls hardness, strength, toughness and wear resistance of steels, aluminium and other alloys.

What it is for: Controlling metal properties.

It can be explain processes; relay parameters and standards; describe surface hardening; distinguish related processes.

Distinguishing features

Thermal cycles

Microstructure control

Bulk and surface variants

Standardised specifications

What it looks like

Furnaces, quench tanks and parts changing colour and hardness.

Physical character

steel austenitising range: about 750-950 C - typical

nitriding temperature: about 500-570 C

carburizing temperature: about 850-950 C

How it is recognised

Controlled heating and cooling of metals

Annealing, hardening, tempering, carburizing, nitriding, plasma nitriding, ferritic nitrocarburizing

Hot working deforms the metal; sintering forms parts from powder; glass tempering is separate

Related models

is a kind of - in registry terms

process

changes - of metals

microstructure

is applied to - and other alloys

steel

uses - and quench media

industrial furnace

In practice

Families and kinds

annealing and normalising

hardening, quenching and tempering

case hardening by carburizing and carbonitriding

nitriding by gas, salt bath and plasma

nitrocarburizing including ferritic nitrocarburizing

precipitation hardening of aluminium and other alloys

induction and flame hardening

Standards and regulation

Standards such as AMS 2759, ISO 683 and SAE J1268

Furnace pyrometry standards such as AMS 2750

Occupational safety rules for furnaces, quenchants and gases

Failure modes and hazards

Cracking and distortion from quenching

Decarburisation and oxidation

Confusing surface and bulk processes

Also called

ferritic nitrocarburizingNitrocarburizingnitridingcarburizinggas nitridingplasma nitridingHigh temperature nitridingMid temperature nitridinglow temperature nitridingpack cementationmid temperature carburizinglow temperature carburizinglow temperature plasma nitridingrecrystallizationthermal cleaninglow hydrogen annealingOhmic heating of foodsaustenitizationSpheroidizationprecipitation hardeningdynamic recrystallizationgeometric dynamic recrystallizationsubgrain rotation recrystallization

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Understand What heat treatment is.

Science.

Definition

Definition.

Definition

Definition.

  1. What is heat treatment, and how does it change microstructure and properties? definition
  2. Is the question about heat treatment of metals, hot working or thermal processing of other materials? boundary

Processes

Processes.

Processes

Processes.

  1. How do annealing, hardening, tempering, carburizing, nitriding and nitrocarburizing differ? definition
  2. Which entry fits the specific process? action
Engineer Practice.

Practice.

Parameters

Parameters.

Parameters

Parameters.

  1. How are temperatures, times, atmospheres and quench media chosen for a given alloy? action
  2. Which references are standard? provenance

Surface

Surface hardening.

Surface

Surface.

  1. How do gas and plasma nitriding and ferritic nitrocarburizing produce hard cases, and where are they used? provenance
  2. Which sources are cited? provenance
Quality Quality and standards.

Regulation.

Standards

Standards.

Standards

Standards.

  1. What standards govern heat treatment specification, furnace control and testing? provenance
  2. Which entry fits the specific standard? action

Defects

Defects.

Defects

Defects.

  1. What defects arise from heat treatment, and how are they prevented and inspected? provenance
  2. Which entry fits quench cracking? action
Context Industry and history.

Context.

Industry

Industry.

Industry

Industry.

  1. How is heat treatment organised in industry, from in-house lines to commercial heat treaters? provenance
  2. Which entry fits metalworking? action

History

History.

History

History.

  1. How did smiths and metallurgists develop hardening and tempering historically? provenance
  2. Which entry fits the history of metallurgy? action

What the second pass must settle

  • Should nitriding and carburizing be separate primary entries?
  • How should metallurgical standards be linked?
  • The registry entry has merged aliases naming specific processes; should they be split off?
Draft as JSON