Effect of vanadium on microstructure and properties of hot-rolled invar alloy

doi:10.13251/j.issn.0254-6051.2023.06.037

Abstract

Abstract: Effect of trace V on microstructure, mechanical properties and thermal expansion properties of hot-rolled invar alloy was studied by means of optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Vickers hardness tester, electronic universal tensile testing machine, and thermal expansion tester. The results show that grain size of the hot-rolled invar alloy significantly reduces and the microstructure is dramatically refined after adding 0.14%C and 0.63%V. The yield strength and tensile strength reach 348 MPa and 569 MPa, respectively, which is enormously improved compared with the conventional invar alloy. And the elongation is 40.0%, thermal expansion coefficient α_{20-200 ℃}=3.16×10^-6℃^-1, which is still at a low level. Solution strengthening, grain refinement and precipitation strengthening are the main reasons for improvement of mechanical properties of the invar alloy.

Key words: invar alloy, V microalloyed, microstoucture, strength, thermal expansion coefficient

CLC Number:

TG142.31

Feng Liang, Fan Xuanyu, Chen Jiwu, Yu Yanchong, Zhang Jinling. Effect of vanadium on microstructure and properties of hot-rolled invar alloy[J]. Heat Treatment of Metals, 2023, 48(6): 206-210.

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