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In this work,DIFT technology and Q&P process were combined in order to introduce ultrafine-grained ferrite into the matrix of martensite and retained austenite to develop a new kind of advanced high strength steel,and two kinds of steels were investigated by this novel combined process.The newly designed process resulted in a sophisticated microstructure of a large amount of ferrite(about 5 m in diameter),martensite and a considerable amount of retained austenite for TRIP 780 steel.The ultimate tensile strength can reach about 1200 MPa with elongation above 16% for TRIP 780,that is much higher than the one solely treated by Q&P process.Tensile tests showed that both steels with the novel combined process achieved a good combination of strength and ductility,indicating that the new process is promising for the new generation of advanced high strength steels.
In this work, DIFT technology and Q & P process were combined in order to introduce ultrafine-grained ferrite into the matrix of martensite and retained austenite to develop a new kind of advanced high strength steel, and two kinds of steels were investigated by this novel combined process . The newly designed process resulted in a large amount of ferrite (about 5 m in diameter), martensite and a considerable amount of retained austenite for TRIP 780 steel. Ultimate tensile strength can reach about 1200 MPa with elongation above 16 % for TRIP 780, that is much higher than the one and single treated by Q & P process. Tenile tests showed that both steels with the novel combined process achieved a good combination of strength and ductility, indicating that the new process is promising for the new generation of advanced high strength steels.