Effect of TiN on toughness of high-strength wear-resistant steel and its mechanism analysis
WANG Shuai1,2, HU Feng1,2, LI De-fa1,2, ZHOU Wen1,2, WU Kai-ming1,2
1. Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
Abstract:SEM, EDS, TEM and other technologies combined with thermodynamic software were used to study the effect of Ti content on the low-temperature impact toughness of low-alloy wear-resistant steel, size and morphologies of fracture inclusions, and the relationship between morphologies of inclusions and impact toughness. The results showed that the low-alloy wear-resistant steel with a Ti mass fraction of 0.03% had the best low-temperature (-40 ℃) impact performance, which could reach 33.0 J. The morphology of TiN inclusion in the fracture surface showed three types of morphologies, namely, narrow cracks, holes and tearing crack. With the increase of Ti content, the morphology changed from intact to broken. Analysis of the breaking mechanism of TiN revealed that TiN breaking was caused by two mechanisms, namely, cracks propagated to form holes leading to breakage and the main cracks derived more secondary cracks and cause breaking.
王帅, 胡锋, 李德发, 周雯, 吴开明. TiN对高强度耐磨钢韧性的影响及其机制分析[J]. 中国冶金, 2021, 31(7): 38-45.
WANG Shuai, HU Feng, LI De-fa, ZHOU Wen, WU Kai-ming. Effect of TiN on toughness of high-strength wear-resistant steel and its mechanism analysis[J]. China Metallurgy, 2021, 31(7): 38-45.
GUI L T,LONG M J,ZHANG H H,et al. Study on the precipitation and coarsening of TiN inclusions in Ti-microalloyed steel by a modified[J]. Journal of Materials Research and Technology,2020,9(3):5499.
LIANG W,WU R,YUAN Q,et al. Investigation on precipitation behavior and morphology of TiN particles in high-Ti low-carbon high-strength steel[J]. Trans Indian Institute of Metals,2020,73:151.
Prikryl M,Kroupa A,Weatherly G C,et al. Precipitation behavior in a medium carbon,Ti-V-N microalloyed steel[J]. Metallurgical and Materials Transactions A,1996,27(5):1149.
[14]
KANG Y,MAO W M,CHEN Y J,et al. Effect of Ti content on grain size and mechanical properties of UNS S44100 ferritic stainless steel[J]. Materials Science and Engineering A,2016,677:211.
XIE Z J,SHANG C J,WANG X L,et al. Microstructure-property relationship in a low carbon Nb-B bearing ultra-high strength steel by direct-quenching and tempering[J]. Materials Science and Engineering A,2018,727:200.
[17]
Fairchild D P,Howden D G,Clark W A T. The mechanism of brittle fracture in a microalloyed steel:Part I. Inclusion-induced cleavage[J]. Metallurgical and Materials Transactions A,2000,31(3):641.