DIL 805A/D/T Quenching and Deformation Dilatometers

The quenching dilatometers series are used to examine the heat treatment of steel and metal alloys to identify the heating rate, the quenching rate and the isothermal dwell times essential for yielding the crystalline structure to meet the required physical properties.

The DIL805 Series consists of four models:

DIL 805L, DIL 805A are quenching dilatometers.
DIL 805A/D is a quenching dilatometer with the ability to deform the specimen by compression.
DIL 805A/D/T can also stretch it in tension mode.

All the four instruments are totally automated, self-contained units used to measure dimensional variations under extreme conditions of controlled cooling and heating.

In the quenching mode, the sample, hollow or solid, is inductively heated to a temperature plateau and is then cooled at a user-defined (exponential or linear) cooling rate. The phase transformation occurring in the continuous cooling process or in the isothermal dwell, with or without compression/tensile stress, is specified by the measured variation in length. An array of isothermal or cooling curves indicates an isothermal time-temperature-transformation (TTT) diagram or a continuous-cooling-transformation (CCT) diagram, respectively.

The DIL 805A specifies the benchmark for establishing these dimensional changes and phase transitions. Functioning from -160 °C up to 1500 °C (in two diverse furnace configurations) with heating rates of up to 4000 °C/s and cooling rates of 2500 °C/s, can closely mimic the material response for any heat treatment process or production.

The DIL 805A/D, on top of the quenching mode, is well-known for its capability to deform the specimen with controlled deformation rates of 0.01 to 200 mm/s. Used to improve steel processes like hot or cold rolling, the DIL 805A/D allows to develop time-temperature-transformation diagrams after deformation (DTTT) and is also used to test creep and relaxation processes.

The DIL 805A/D/T additionally extends the capabilities to alternate tensile and compressive loading to emulate mill processing. Furthermore, tensile loading to fracture lends extra information about material’s final performance and allows to create true-stress vs true-strain or stress/strain cycling plots.


  DIL 805L DIL 805A DIL 805A/D DIL 805A/D/T
Temperature Range
(sample dependent)
-150 °C to 1300 °C
50 °C to 1500 °C
-150 °C to 1300 °C
50 °C to 1500 °C
50 °C to 1500 °C 50 °C to 1500 °C
Heating principle inductive inductive inductive inductive
Sample material Electrically conductive hollow or solid body Electrically conductive hollow or solid body Electrically conductive solid body Electrically conductive solid body
Sample Geometry OD 4 mm
Length 10 mm
OD 4 mm
Length 10 mm
OD 5 mm
Length 10 mm
OD 5 mm
Length 10 mm
Length Resolution 50 nm 50 nm 50 nm 50 nm
Temperature Resolution 0.05 °C 0.05 °C 0.05 °C 0.05 °C
Atmosphere inert gas, vacuum, air inert gas, vacuum, air inert gas, vacuum, air inert gas, vacuum, air
Heating rate
Cooling rate
2000 °C/sec
2500 °C/sec
4000 °C/s
2500 °C/sec
100 °C/s
100 °C/sec
100 °C/s
100 °C/sec
Deformation force     up to 20.0 kN up to 8.0 kN
Deformation rate     0.01 – 200 mm/s 0.01 – 20 mm/s
Strain rate φ     0.001 – 20.0 s-1 0.001 – 20.0 s-1
True strain φ     0.05 – 1.2 0.05 – 1.2
Minimum Gage Length     3 mm 3 mm
Number of deformation steps     any number any number
Pause between deformation steps     60 msec 60 msec

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