Transactions of Materials and Heat Treatment

Title：Influence of final rolling temperature on microstructure and properties of ultra-high nitrogen austenitic steel

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ClassificationCode：TG142.1

year,vol(issue):pagenumber：2025,50(8):146-151

Abstract：

The ultra-high nitrogen austenitic stainless steel was rolled at different final rolling temperatures. The microstructure after hot rolling was characterized by optical microscope, scanning electron microscope and energy spectrometer. The mechanical properties were tested by hardness and tensile tests, and the infuences of different final rolling temperatures on the mechanical properties of the test steel were analyzed. The results show that as the final rolling temperature decreases, the (Nb,V)N phases dispersed inside the grains gradually concentrates along the grain boundaries. The hardness of the test steel increases from 420 HV to 467 HV, the yield strength increases from 1056.6 MPa to 1295.4 MPa, the tensile strength increases from 1194.1 MPa to 1341.6 MPa, the elongation after fracture decreases from 22.7% to 14.1%, and the tensile fracture mode changes from ductile fracture to a mixed fracture of micropore aggregation fracture and cleavage fracture.

Funds：

河北省自然科学基金资助项目（E2022209114）

作者简介：张荣华（1980-），女，博士，副教授 E-mail：zrh1980@126.com

Reference：

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