锻压技术

终轧温度对超高氮奥氏体钢组织和性能的影响

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

单位：1. 华北理工大学教育部现代冶金技术重点实验室 2. 邢台钢铁有限责任公司 3. 西安康明斯发动机有限公司 4. 中冶沈堪秦皇岛工程设计研究总院有限公司

分类号：TG142.1

出版年,卷(期):页码：2025,50(8):146-151

摘要：

选用不同的终轧温度对超高氮奥氏体不锈钢进行轧制，利用光学显微镜、扫描电子显微镜配合能谱仪表征热轧后的显微组织，通过硬度、拉伸试验测试力学性能，并分析不同终轧温度对试验钢力学性能产生的影响。结果表明，随着终轧温度的降低，晶粒内部弥散分布的(Nb,V)N相逐渐沿着晶界集中分布，试验钢的硬度由420 HV上升至467 HV，屈服强度由1056.6 MPa上升至1295.4 MPa，抗拉强度由1194.1 MPa上升至1341.6 MPa，断后伸长率由22.7%下降至14.1%，拉伸断裂形式由韧性断裂转变为微孔聚集型断裂和解理断裂的混合断裂。

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.

基金项目：

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

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