Effect of W on microstructure of high strength and toughness steels

doi:10.11890/1006-7191-116-423

Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (6): 423-431.DOI: 10.11890/1006-7191-116-423

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Effect of W on microstructure of high strength and toughness steels

Yan LU^1,2, Jie SU², Junhua WANG³, Gang XIE¹,Zhuoyue YANG²

1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093, China
2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China
3. Department of Electrical Engineering, Henan Industrial School, Zhengzhou 450053, China

Received:2011-04-01 Revised:2011-06-24 Online:2011-12-25 Published:2011-12-22
Contact: Junhua WANG3

Abstract

Abstract: The effect of W on the microstructure and the mechanical properties of ultrahigh strength low alloy steels was carried out. The microstructure of 30Cr3Si2Mn2NiMoNb and 30Cr3Si2Mn2NiMoNbW steels under quenched conditions were investigated by metallographic microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), and transmission electron microscope (TEM). Thermodynamic calculation was also conducted. The results showed that the addition of W made undissolved carbides more and finer, which exerted strong pinning force on migrating packet boundary and improved tensile strength significantly. M₆C particles in 30Cr3Si2Mn2NiMoNb steel were disappeared above 1193 K, while the M₆C particles in 30Cr3Si2Mn2NiMoNbW steel were disappeared above 1253 K, the calculation results were in agreement with the experimental.

Key words: High strength and toughness steel, Tungsten, Microstructure, Undissolved carbides, Thermodynamic calculation

Yan LU, Jie SU, Junhua WANG, Gang XIE,Zhuoyue YANG. Effect of W on microstructure of high strength and toughness steels[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(6): 423-431.

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Effect of W on microstructure of high strength and toughness steels

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