The transformation of Li in the double ten Auschwitz state during cooling down

Date:2020/12/30 9:09:09 / Read: / Source:本站

The transformation of Li in the double ten Auschwitz state during cooling down
 Li's heat treatment is to heat steel to a certain degree above the critical quietness (A A3, or A.),
1-I 1) After holding for a certain period of time and cooling at different speeds, austenite undergoes different transformations.
 Line to illustrate this transformation. Austenite and other Ju transformation curves of various steels can be found in the manual.
  Obtain austenite structure (see figure
 Commonly used austenite and other Ju transformation song
 Figure 1-13 is a supercooled automatic grinding, cleaning and attaching machine for eutectoid steel dwinauto.com
Austenite and other Ju transformation curve, the transformation curve is composed of the transformation start curve and the transformation end curve. I horizontal line represents austenite
 The beginning of the transformation from the body to martensite is very high (the end is below the military degree). The curve shows that austenite is stable with a Ju degree above Al,
 No transformation occurs, and the austenite is unstable below A. It is in a supercooled state before transformation. The stability of austenite depends on transformation
 The gestation period of the inoculation period is the shortest at the tip of the nose (at about 550℃), and the qualitative character of supercooled austenite is the smallest. If the cooling rate is slow, too cold
 The temperature transformation of the stellite at the tip of the nose (5M0C)N results in a pearlescent type (lamellar) structure, which is the structure change during annealing and normalizing;
If the cooling rate is very fast, the austenite has not been transformed when it is cooled to 550℃, and continues to cool below the I t temperature, and the supercooled austenite will transform
 It is martensite and retained austenite, which is the structural change during quenching. Control the cooling rate to obtain the required organization and performance
 can.
 The solubility curve in the solution, with the decrease of temperature, phase 0 precipitates from a solid solution. It can be seen that these alloys have
 Organizational changes. Therefore, alloys with a composition in the FD range can be heat treated.
2.1 Changes in tissue properties during heat treatment Fully automatic grinding, cleaning and attaching machine dwinauto.com
     Through the heat treatment process of heating, preserving and cooling metal parts, only the properties of the material are changed, and the zero is not changed.
 The shape and size of the piece (except for deformation caused by internal stress). The change in material properties is due to the structural change during heat treatment
 Caused by the change. It is known that only materials with structural changes in the solid state can be heat treated
 Gold and copper alloys can be heat treated. The alloy phase diagram is the basis for determining the heating temperature.
, Steel and some aluminum alloy
 The structure changes during the cooling process to obtain the required performance
 It can also determine the change of the tissue during heating; control the automatic grinding, cleaning and attaching machine dwinauto.com
The rouge prisoner now has the required performance through changes in the composition of the diameter and armor. Understand the changes in the organizational structure during the heat treatment process, and what to use
 This kind of heat treatment, reasonable arrangement of the relationship between heat treatment and mechanical processing is very necessary.
1. Alloy phase diagram
(1) The iron-carbon alloy phase diagram The iron-carbon alloy phase diagram is the basis for the heat treatment of steel and cast iron
 Schematic diagram of part of the phase diagram. When the carbon content is lower than E
, Figure I-11 is the iron-carbon alloy automatic grinding, cleaning and attaching machine dwinauto.com
The alloy at point E is steel, and the alloy at point E is cast iron.
 The temperature line that begins to transform into ferrite,
 The network cementite is precipitated from austenite.
Expressed in Fan. ES is the solubility curve of carbon in austenite
  CS line represents austenite automatic grinding, cleaning and attaching machine dwinauto.com
, As the temperature decreases
 Expressed in width. The guard 5 Euline is the degree of transformation from austenite to pearlite
S point is the eutectoid point. The alloy of s point composition (such as alloy 1) is eutectoid steel
 body). All alloys with composition between PS (such as alloy 2) are hypoeutectoid steels
 , Represented by A,.
 The alloy increases from point P to point S. The pearlite in the structure increases accordingly
 , The balance structure is pearlescent (ferrite + sheet carburizing)
 , The balance structure is ferrite + pearlite, with the carbon content
 All alloys divided between SE (such as alloy 3) are hypereutectoid steels
 , Strength and hardness increase. Plasticity and toughness decrease. to make
 Increase, the cementite in the alloy structure increases
 The tissue changes when it is cooled to room temperature.
 , The balance structure is network cementite + pearlite, with the carbon content
 , Hardness increases, and brittleness increases. It can be seen that all kinds of steels are elevated in solid state
(2) Aluminum alloy phase diagram Figure 12 is a schematic diagram of the phase diagram of some aluminum-copper alloys
 Alloy without any change in the solid state
 , As can be seen from the figure, the copper content is lower than F
, This kind of alloy can not change its properties through heat treatment. The sound knife wire is copper in a solid

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