A thermo-mechanical coupled finite element model was established

which combined the linear mixture thermal expansion model

the modified Avrami transformation dynamics model

and the Leblond transformation induced plasticity(TRIP) model.This coupled model considered thermal expansion

transformation dilatation and TRIP effect.The effect of latent heat and TRIP on the temperature and residual stresses of X65 heavy pipeline-plate was quantitatively analyzed.The warping of the plate was investigated under the condition of three kinds of controlled-cooling procedures.The result shows that latent-heat slows the cooling speed to 52.3% at the inner layer part of the plate during phase transformation when a symmetric controlled-cooling with laminar-cooling-coefficient is 1 mW/(mm2·K) on both surfaces of the plate.The latent heat and TRIP effect induce the peak residual stresses 119 MPa and-91 MPa

87 MPa and-60 MPa

respectively

which reduce the total residual stresses in the plate.The temperature difference between top surface and inner layer is enlarged from 107 ℃ to 192 ℃

253 ℃ if the laminar-cooling-coefficient on top surface increases from 1 mW/(mm2·K) to 2 mW/(mm2·K)

3 mW/(mm2·K).The peak residual tensile stresses between top surface and inner layer are reduced from 338 MPa to 150 MPa simultaneously.As a result

the warping is increased from 0 to 0.05×10-3

1.7×10-3.