High temperature plastic deformation behavior of 0Cr19Mn21Ni2N high nitrogen steel for non-magnetic drilling collar

doi:10.13251/j.issn.0254-6051.2022.01.019

Abstract

Abstract: High temperature tensile test of 0Cr19Mn21Ni2N high nitrogen austenitic stainless steel for non-magnetic drilling collar was conducted by using Gleeble-2000 thermal simulation testing machine, the tensile fracture and the microstructure nearby the fracture were analyzed by means of SEM and EDS, the phase transformation and precipitated phases were calculated by using Thermo-Calc software, and then the high temperature plastic deformation behavior of the steel was studied. The results show that the brittle zone I of the tested steel is higher than 1150 ℃ and brittle zone III is in the range of 800-950 ℃, and the brittle zone II is not observed. The appearance of the brittle zone I is mainly caused by the transformation of the tested steel from γ to δ ferrite during the heating process. The brittle zone III is caused by M₂(C, N) precipitates and Al₂O₃ inclusions. With the increase of temperature, the high temperature tensile strength of the tested steel gradually decreases. The reduction of area shows excellent thermoplasticity in the range of 1000-1150 ℃ and gradually decreases after the temperature exceeds 1150 ℃. The hot forging temperature of the 0Cr19Mn21Ni2N high nitrogen austenitic stainless steel should be selected between 1000 ℃ and 1150 ℃, the reduction of area in this temperature range is all above 73%, and the brittle zone I and III can be avoided.

Key words: high nitrogen austenitic stainless steel, high temperature plasticity, non-magnetic drilling collar, Thermo-Calc software, reduction of area

CLC Number:

TG142.7

Wang Yinghu, Zheng Huaibei, Song Lingxi, Bai Qingqing, Yao Bin, Wang Liwei. High temperature plastic deformation behavior of 0Cr19Mn21Ni2N high nitrogen steel for non-magnetic drilling collar[J]. Heat Treatment of Metals, 2022, 47(1): 113-119.

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