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FATIGUE BEHAVIOR OF BAINITE/MARTENSITE MULTIPHASE HIGH STRENGTH STEEL TREATEDBY QUENCHING-PARTITIONING-TEMPERING PROCESS |
Xiaolu GUI1,Baoxiang ZHANG2,Guhui GAO1(),Ping ZHAO3,Bingzhe BAI1,3,Yuqing WENG1,3 |
1 Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China 2 GRIKIN Advanced Materials Co. Ltd., Beijing General Research Institute of Nonferrous Metals, Beijing 102200, China 3 Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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Cite this article:
Xiaolu GUI,Baoxiang ZHANG,Guhui GAO,Ping ZHAO,Bingzhe BAI,Yuqing WENG. FATIGUE BEHAVIOR OF BAINITE/MARTENSITE MULTIPHASE HIGH STRENGTH STEEL TREATEDBY QUENCHING-PARTITIONING-TEMPERING PROCESS. Acta Metall Sin, 2016, 52(9): 1036-1044.
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Abstract Recently, low-cost advanced high strength steels (AHSS) with high toughness and fatigue limit have been developed in order to ensure the safety and lightweight of the engineering components. As promising candidates for next generation of AHSS, the bainite/martensite multiphase high strength steels exhibit excellent combination of strength and toughness due to the refined multiphase microstructure and retained austenite films located between bainitic ferrite laths. The previous works showed that the mechanical properties of bainite/martensite multiphase steels can be further improved through quenching-partitioning-tempering (Q-P-T) process. In the present work, the effect of Q-P-T process on the microstructure and fatigue behaviors of steels was investigated, and the relationship between the microstructure and the fatigue crack propagation was discussed in detail. Here, a 20Mn2SiCrNiMo bainite/martensite multiphase steel was treated by Q-P-T processes: (1) quenching to 200 ℃, partitioning at 280 ℃ for 45 min and finally tempering at 250 ℃ for 2 h (QPT200 sample); (2) quenching to 320 ℃, partitioning at 360 ℃ for 45 min and finally tempering at 250 ℃ for 2 h (QPT320 sample). Microstructure observations showed that the QPT200 sample consisted of leaf-shaped bainite, martensite and filmy retained austenite (RA), while some blocky martensite/austenite (M/A) islands were observed in QPT320 sample. The volume fractions of retained austenite in QPT200 and QPT320 samples are 4.5% and 9.8%, respectively. The fatigue crack propagation rate da/dN and threshold value of fatigue cracking ΔKth were measured using compact-tensile specimens. The results showed that the Q-P-T process parameters had a significant influence on the microstructures and fatigue properties of the bainite/martensite multiphase steels. The bainite/martensite multiphase steel after appropriate Q-P-T treatment (QPT 200 sample in the present work) has higher ΔKth and lower da/dN, which originates from the resistance on fatigue crack propagation due to the presence of leaf-shaped bainite and nanometer-sized retained austenite films. Furthermore, although the volume fraction of retained austenite in QPT320 sample is higher than that in QPT200 sample, the ΔKth of QPT 320 sample is lower than that of QPT200 sample. It is suggested that the effect of retained austenite on the fatigue behaviors depends on its volume fraction, size and morphology.
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Received: 28 December 2015
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Fund: Supported by National Natural Science Foundation of China (No.51271013) |
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