Introduction
Experimental Procedures
cp-Ti | Chemical composition, mass% | |||||
Fe | O | N | C | H | Ti | |
0.022 | 0.047 | 0.005 | 0.004 | 0.003 | Rest | |
Mechanical properties | ||||||
R0,2
| Rm
| A | E | |||
190 MPa | 308 MPa | 52% | 105 GPa |
S355J2+N | Chemical composition, mass% | |||||
C | Si | Mn | P | S | Fe | |
0.193 | 0.350 | 1.480 | 0.013 | 0.003 | Rest | |
Mechanical properties | ||||||
R0,2
| Rm
| A | E | |||
360 MPa | 560 MPa | 29% | 192 GPa |
Results and Discussion
Microstructure of the Joint
Microstructure of the Joint: Vortexes
Point | Chemical composition, mol.% | ||
---|---|---|---|
Ti | Mn | Fe | |
1 | 48.9 | 0.7 | 50.3 |
2 | 31.3 | 1.2 | 67.5 |
3 | 45.8 | 0.9 | 53.3 |
Point | Chemical composition % weight | ||
---|---|---|---|
Ti | Mn | Fe | |
1 | 47.3 | 1.4 | 51.4 |
2 | 37.0 | 0.9 | 62.1 |
Microstructure of the Joint: Transition Zone
Fatigue Behaviors
Bending moment, Nm | Before heat treatment | After heat treatment | ||||||
---|---|---|---|---|---|---|---|---|
Fatigue life, Nf | Average value | Fatigue life, Nf | Average value | |||||
48 | 2,000,000 | ⋯ | ⋯ | 2,000,000 | 2,000,000 | ⋯ | ⋯ | 2,000,000 |
60 | 2,000,000 | ⋯ | ⋯ | 2,000,000 | 2,000,000 | ⋯ | ⋯ | 2,000,000 |
72 | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000 | 2,000,000 | 1,574,700 | 2,000,000 | 1,858,233 |
84 | 348,500 | 863,800 | 749,900 | 654,067 | 283,300 | 218,400 | 135,700 | 212,467 |
96 | 277,000 | 360,150 | 332,600 | 323,250 | 178,300 | 115,300 | 102,900 | 132,167 |
108 | 100,300 | 148,850 | 219,650 | 156,267 | 46,900 | 43,800 | 48,400 | 46,367 |
120 | 34,900 | 118,100 | 58,850 | 70,617 | 25,670 | 22,280 | 32,300 | 26,750 |