PSI - Issue 33

Wei Song et al. / Procedia Structural Integrity 33 (2021) 795–801 Author name / Structural Integrity Procedia 00 (2019) 000–000

799

5

(c)

(d)

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2

1.2

-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

1.0

Speed of heating: 200 ° C/s

Speed of cooling: 20 ° C/s

10CrNi3MoV

10CrNi3MoV

Martensite fraction:

Austensite fraction:

1.0

0.8

Kamamoto model:

Koistenen-Marburger model:  1 exp 0.028 463 A f T        

0.8

  

   

1.60

790

T  

 

1 exp 1.74     

f

0.6



A

790 855   

0.6

0.4

heating

0.4

cooling

Austenite

0.2

0.2

Themal strain /%

Themal strain /%

Martensite

0.0

0.0

Ac 1

Ac 3

M f

M s

-0.2

Martensite transformation fraction

100 200 300 400 500 600 700 800 -0.2

Austensite transformation fraction

600

700

800

900

1000

Temperature ( ° C)

Temperature ( ° C)

Fig. 4 (a) CCT curve of 10CrNi3MoV; (b) Phase transformation curves under different heating and cooling speeds; (c) Calculation of austenite transformation fraction; (d) Calculation of martensite transformation fraction. where M f is the martensite proportion of material. 0 ( 0.028) b  is a material constant, which exhibits the evolution of the martensitic transformation phenomenon. the total volumetric change in our study can be predicted considering these values, which are presented in Fig. 4(c) and (d).

(ΙΙ)

(Ι)

(ΙΙΙ)

(ΙΙ)

(ΙΙΙ)

(Ι)

Fig. 5. The residual stress contours considering different factors effect for evenmatched and undermatched welded joints. (a) Evenmatched welded joints, (b) Undermatched welded joints. 3. Results and discussion 3.1. Residual stress distributions in mismatched welded joints The longitudinal and transverse residual stresses were simulated according to the thermal-mechanical material properties, shown in Fig. 5. A comparison of residual stress distributions was made among the FE model results for