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Chinese Journal of Materials Research  2018, Vol. 32 Issue (3): 177-183    DOI: 10.11901/1005.3093.2018.131
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Microstructure Evolution and Mechanical Properties of Cold-rolled Mn-Al TRIP Steel with δ Ferrite
Zhiping HU1, Yunbo XU1(), Hui LIU2, Le WANG2
1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;
2 Research Instituteof Iron and Steel of Shandong Iron and Steel Group, Jinan 250101, China;
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Zhiping HU, Yunbo XU, Hui LIU, Le WANG. Microstructure Evolution and Mechanical Properties of Cold-rolled Mn-Al TRIP Steel with δ Ferrite. Chinese Journal of Materials Research, 2018, 32(3): 177-183.

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Abstract  

The microstructure evolution and mechanical properties of a cold-rolled Mn-Al transformation-induced plasticity (TRIP) steel with δ ferrite were investigated after annealed at different intercritical annealing temperature for different time. The results show that as the intercritical annealing temperature and time going up, the content of retained austenite (RA) and the product of strength and elongation (PSE) increased first and then decrease. The microstructure of the steel after annealing at 750℃ for 2 min consists of δ ferrite, intercritical ferrite and 24.7% retained austenite, which exhibited a tensile strength of 773 MPa, elongation of 39.4% and the product of strength and elongation of 30.46 GPa%. RA mainly exits at the boundaries between bulky δ ferrite and original martensite, around the recrystallization ferrite from original martensite area, and around the sub-grain boundaries inside δ ferrite.
Key words:  metal materials      TRIP steel with δ ferrite;      mechanical property      retained austenite     
Received:  09 October 2017     
ZTFLH:  TG113  
Fund: Supported by National Natural Science Foundation of China (Nos. 51174059, 51404155 & U1260204), Fundamental Research Funds for the Central Universities (No. N130407003), Program for New Century Excellent Talents in University (No. NCET-13-0111) and Program for Liaoning Excellent Talents in University (No. LR2014007)
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Zhiping HU
Yunbo XU
Hui LIU
Le WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.131     OR     https://www.cjmr.org/EN/Y2018/V32/I3/177

Fig.1  Rolling schedule for experiment steel
Fig.2  Phase diagrams of different Al content (a) 0Al, (b) 1Al, (c) 2Al, (d) 3Al
Fig.3  Microstructures of different austenizing temperatures (a) 700℃, (b) 750℃, (c) 800℃
Fig.4  SEM microstructure of the cold-rolled tested steel at different temperature (a) 650℃ (b) 700℃ (c) 750℃ (d) 800℃ (e) 850℃
Temperature
/°C		 Rp0.2
/MPa		 Rm
/MPa		 Δ
%		 Rp0.2/Rm PSE
/GPa%		 RA
/%
650 667 759 20.8 0.87 15.8 12.4
700 652 751 24.1 0.85 18.2 18.2
750 631 783 39.4 0.80 30.5 24.9
800 520 920 18.3 0.57 17.0 18.6
850 789 1054 11.0 0.74 11.6 10.9
Table 1  Mechanical properties and retained austenite content of the investigated steel at different intercritical temperature
Fig.5  TEM microstructure of the investigated steel annealing at 750℃ in 2 min (a) bright field (b) dark field (c)
Fig.6  EBSD results of the tested steel annealing at 750℃ in 2 min
Fig.7  SEM microstructure of different intercritical annealing time at 750℃ (a) 1 min, (b) 2 min, (c) 5 min, (d) 10 min
Time
/min		 Rm
/MPa		 Δ
%		 PSE
GPa%		 RA
%
1 726 25 18.1 9.7
2 787 45 35.4 24.7
5 927 20 18.5 13.3
10 951 14 13.3 10.1
Table 2  Mechanical properties and retained austenite content of the investigated steel of different intercritical annealing time
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