Effect of retained/reversed austenite on improving -196 ℃ cryogenic impact property of high strength stainless steel

doi:10.13251/j.issn.0254-6051.2021.05.011

Abstract

Abstract: High strength stainless steel 0Cr16Ni6 treated by quenching+low temperature tempering, and maraging stainless steel 00Cr11Ni11MoTi treated by over aging were studied by means of mechanical properties tests, SEM and XRD, and the effects of retained/reversed austenite in the tested steels on -196 ℃ cryogenic notched tensile strength and impact property were analyzed. The results show that, with the nearly same strength and toughness of the tested steels at room temperature, the notch tensile strength and impact property of the 0Cr16Ni6 steel are significantly higher than that of the 00Cr11Ni11MoTi steel at -196 ℃. According to the residual/reversed austenite contents quantitatively calculated based on the relative intensities of the martensite and austenite diffraction peaks far from the fracture and near the fracture, it is found that nearly 90% retained austenite in the 0Cr16Ni6 steel transforms into strain-induced martensite during the formation and propagation of cracks, which improves cryogenic impact property remarkably. But the reversed austenite formed by over-aging of the 00Cr11Ni11MoTi steel has higher stability, which is not suitable for strain-induced martensite transformation to occur, so the improvement of -196 ℃ cryogenic toughness is limited.

Key words: high strength stainless steel 0Cr16Ni6, maraging stainless steel 00Cr11Ni11MoTi, retained austenite, reversed austenite, cryogenic toughness

CLC Number:

TG142.1

Qiu Xuyangfan, Yang Zhuoyue, Ding Yali. Effect of retained/reversed austenite on improving -196 ℃ cryogenic impact property of high strength stainless steel[J]. Heat Treatment of Metals, 2021, 46(5): 71-74.

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