EFFECT OF TEMPERING TIME ON MICROSTRUC- TURE AND MECHANICAL PROPERTIES OF HIGH Ti MICROALLOYED QUENCHED MARTENSITIC STEEL

doi:10.11900/0412.1961.2014.00470

Acta Metall Sin

2015, Vol. 51

Issue (5): 553-560 DOI: 10.11900/0412.1961.2014.00470

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EFFECT OF TEMPERING TIME ON MICROSTRUC- TURE AND MECHANICAL PROPERTIES OF HIGH Ti MICROALLOYED QUENCHED MARTENSITIC STEEL

Ke ZHANG^1,²,Xinjun SUN²(

),Qilong YONG²,Zhaodong LI²,Gengwei YANG³,Yuanmei LI^1,²

1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093
2 Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081
3 School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081

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Ke ZHANG, Xinjun SUN, Qilong YONG, Zhaodong LI, Gengwei YANG, Yuanmei LI. EFFECT OF TEMPERING TIME ON MICROSTRUC- TURE AND MECHANICAL PROPERTIES OF HIGH Ti MICROALLOYED QUENCHED MARTENSITIC STEEL. Acta Metall Sin, 2015, 51(5): 553-560.

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Abstract

With the development of Ti microalloying technology, the application and theory research of Ti in microalloyed steels are becoming more deeply and widely. However, the effect of tempering time on the microstructure and mechanical properties of high Ti microalloyed quenched martensitic steel has been rarely touched upon, meanwhile, it has long been inconclusive whether precipitated phases coarsening or the recovery and softening of martensitic matrix is the dominant role resulting in the decrease of hardness along with long time tempering of microalloyed steel. In this work, the effect of tempering time on the microstructure and mechanical properties of high Ti microalloyed quenched steel was systemactically investigated by TEM, XRD and Vickers-hardness test, and the interaction between precipitation hardening and microstructural softening of the high Ti microalloyed steel was also studied. The results indicate that the hardness increases for Ti microalloyed steel with tempering time 10~300 s, which is attributed to the fact that the precipitation hardening by nano-sized TiC particles is greater than the recovery and softening of matrix. With the tempering time from 300 s to 10 h, nano-sized TiC particles precipitate more and more and the mass fraction of TiC with the size less than 5 nm increases, owning to the precipitation hardening produced by tiny TiC which offsets the hardness decrease due to the gradual softening with recovery of matrix, and therefore, the hardness can keep a long platform; in addition, with the tempering time 10~20 h, the hardness decreases significantly and the deacreasing rate of hardening for steel with Ti microalloying is higher than that for steel without Ti microalloying. The average particle size of TiC increases from 2.76 nm at 10 h to 3.15 nm at 20 h. Calculation results show that the decrease of hardness caused by coarsening of TiC is 11.94 HV, while caused by recovery of matrix is 24.56 HV. It is shown that the recovery of matrix is the dominating factor for reduction in hardness, but coarsening of tiny TiC speeds the decrease of hardness and is also an important factor resulting in the decrease of hardness.

Key words: tempering time hardness TiC coarsening martensite lath

Received: 25 August 2014

Fund: National Natural Science Foundation of China (No.51201036) and National Science and Technology Pillar Program (No.2013BAE07B05)

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	Ke ZHANG
	Xinjun SUN
	Qilong YONG
	Zhaodong LI
	Gengwei YANG
	Yuanmei LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00470 OR https://www.ams.org.cn/EN/Y2015/V51/I5/553

Table 1 Chemical compositions of tested steels

Fig.1 Variations of hardness with different tempering times at 600 ℃ for the 2 steels

Fig.2 Size distributions of TiC particles tempering at 600 ℃ for different times for steel 2

Fig.3 Size distribution of TiC in diameter less than 5 nm holding for 10 h and 20 h for steel 2

Fig.4 TEM images of steel 2 tempering at 600 ℃ for 300 s (a), 1 h (b), 7 h (c), 10 h (d), 20 h (e) and EDS analysis of TiC particle for 300 s (f)

Fig.5 TEM images of steel 2 tempering at 600 ℃ for 300 s (a), 1 h (b), 7 h (c), 20 h (d) and Fe₃C in lath boundary for 20 h (e)

Fig.6 TEM images of steel 1 tempering at 600 ℃ for 180 s (a), 10 h (b) and 20 h (c)

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