Tian looked in superb form after beating eventual bronze medallist Chan Wing Kin of Hong Kong 15-4 in the semi-finals, but in the final it was his Chinese rival Chen who edged in front and held on for a 15-12 victory to add gold to the silver medal he collected in the men's Individual Foil on Tuesday.
Earlier in the day, Greece’s Gerasimos Pylarinos had emerged from the pool stages as the number one seed after winning all four of his bouts, but he then lost 15-6 in the quarter-finals to Poland’s Radoslaw Stanczuk.
The Pole went on to lose 15-8 to Chen in the semi-finals and then lost to Hong Kong’s Chan 15-9 in the battle for the bronze.
China’s gold medallist Chen said: ‘It's a dream, every athlete always thinks about winning a gold. I tried to use everything. My main tactic was to be flexible in my upper torso.
‘I feel a bit spoilt with all the attention. The service from the Games Makers, judges and everyone else has been great.’
I feel a bit spoilt with all the attention. The service from the Games Makers, judges and everyone else has been greatChen Yijun
In the men’s Individual Sabre - Category B event, Poland's Grzegorz Pluta claimed gold with a 15-8 success against Frenchman Marc-Andre Cratere in the final.
World number two Cratere had beaten Marat Yusupov 15-13 in his semi-final, but was no match for 37-year-old Pluta in the decider.
The Pole had already beaten his opponent 5-3 in the group stages, before repeating the feat to take the gold.
Italian Alessio Sarri won bronze with a 15-7 victory over Yusupov of Russia.
‘It was a very hard and long day. I was a bit anxious about the hard group,’ said Sarri.
‘I got fifth place in Athens, fifth place in Beijing, and now, here in London, I finally got a medal. So I'm very happy.’