MUCG — TTT / CCT Diagram Calculator for Steels

Chemical Composition / weight percent (wt%)

Carbon 0.0001–2.0

Silicon 0–2.5

Manganese 0–5.5

Nickel 0–4.5

Molybdenum 0–1.5

Chromium 0–3.5

Vanadium 0–1.5

Cobalt 0–4.0

Copper 0–4.0

Aluminium 0–2.0

Tungsten 0–4.0

Boron 0–30 wt_ppm

Fe (balance)—

B effect on DiffT: Δτ = B × 2.94 s (B ≤ 30 ppm) | Δτ = 88.3 s (B ≥ 30 ppm) [Pickering 1978]
DiffT+B shown as dashed curve on TTT; used for CCT reconstructive calculation.

Austenite Grain Size & Mechanical State

Prior Austenite Grain Size, L µm, default 40

Applied Stress, σ

None

Tension

Compression

Pre-strain in Austenite, ε

None

Tensile

Compressive

Widmänstätten Start, WS

—

°C

Bainite Start, BS

—

°C

Martensite Start, MS

—

°C

TTT

Enter composition and calculate

Displacive (B_S → M_S)

Reconstructive

Reconstructive + B (boron-shifted)

M_S

CCT

Calculate TTT first

T / °C	tshear / s	tdiff / s
No data yet

T / °C	t / s
No data yet

T / °C	ΔGpro / J mol⁻¹	ΔGproA / J mol⁻¹	ΔGmax / J mol⁻¹	ΔGson / J mol⁻¹	ΔGTO / J mol⁻¹	ΔG / J mol⁻¹
No data yet

T / °C	xAe3	xAe3+50 J	xT′₀	xT′₀+400 J	x44	xnuc
No data yet