复试-工程材料-英文版5合金钢

The

effect

of

alloy

elements

on

the

isothermal

transformationdiagram

of

austenite.

a)

effect

of

Ni,

b)

effect

of

Cr,

c)

effect

ofW2) Raising

the

quenching

degree3) Raising

theto

the

temperingThe

effect

of

alloy

elements

on

the

temperinga)

effect

of

Si,

b)

effect

of

Mo4) Making

second

hardening5) Preventing

second

kind

of

temper-brittlenessSchematic

of

temper-brittleness

of

steelThe

effects

of

alloy

elements

on

the

hardness

(a)andimpact

toughness

(b)

of

the

ferrite1) Making

the

steel

strengthened(1) Solid

solution

strengthening2. Raising

the

use

properties

of

steels(3) Fine

grain

strengthening(2) Second

phase

strengtheningThe

effect

of

alloy

elements

on

the

austenite

(

)

fielda)

Mn

extending

the

field b)

Cr

narrowing

the

field(2) Forming

the

close

oxide

film

or

intermetallic

compounds2) Making

the

steel

to

get

specialproperties(1) Forming

the

stable

structure

of

a

single

phaseAlloy

steelsalloy

structural

steels4.1.2 The

classification

and

name

of

alloy

steelslow

alloy

high

strength

steelsalloy

carburizing

steelsalloy

temperable

steelsalloy

spring

steelsbearing

steelssuper

high

strength

steelscutting

tool

steelsalloy

tool

steels model

tool

steelsmeasuring

tool

steelsspecial

property

steelsstainless

steelsheat-resistingsteelssteelscold-resistantwear-resisting

steels§4-2 Alloy

structuralsteels4.2.1 Low

alloy

high

strength

steels4.2.2 alloy

carburizing

steelsHeat

treatment

process

of

the

gear

made

from

20

nTi4.2.3 alloy

temperable

steels4.2.4 alloy

spring

steels4.2.5 Bearing

steels§4-3 Alloy

toolsteelsCutting

tool

steelsThe

service

condition

of

the

cutting

toolsProperty

requirement

for

cutting

tool

steelsTypical

alloy

cutting

tool

steelsThe

relationship

between

the

hardness

of

T10,

Crand

9SiCr

steels

and

the

tempering

temperature1) High

carbon

low

alloy

steels2) High

speed

steelHeat

treatment

process

of

the

W18Cr4V

steelThe

structure

of

quenched

W18Cr4VThe

structure

of

tempered

W18Cr4VThe

relationshipbetween

the

hardnessof

W18Cr4V

steelsand

the

temperingtemperature4.3.2 Model

tool

steels1. The

cold

mold

tool

steelsProperty

requirement

for

the

cold

mold

tool

steelsTypical

cold

mold

tool

steelsHeat

treatment

process2. The

hot

mold

tool

steelsProperty

requirement

for

the

hot

mold

tool

steelsTypical

hot

mold

tool

steelsHeat

treatment

process§4-4 Special

property

steels4.4.1 Stainless

steels1. Principle

of

electrochemical

corrosionThe

electrochemical

corrosion

of

the

pearlite2. The

wayto

raising

corrosion-

resistant

property

of

steelElectrode

voltage

of

different

metals3. The

stainless

steels

most

in

use1) Martensite

type

stainless

steelsFerrite

type

stainless

steelsAustenite

type

stainless

steelsSchematic

of

Cr-poor

at

grain

boundary

andintercrystalline

corrosion

in

stainless

steel4.4.2

Heat-resisting

steels1.

The

failure

of

parts

at

high

temperature

and

prevention1) Oxidization

at

high

temperature2) Creep

and

fracture

at

high

temperature2. The

heat-resisting

steels

most

in

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