Effect of Grain Size on Mechanical Properties of Nickel-Free High Nitrogen Austenitic Stainless Steel

• Published in: Journal of iron and steel research, international Vol. 16; no. 1; pp. 58 - 61
• Main Authors: LI, Hua-bing, JIANG, Zhou-hua, ZHANG, Zu-rui, YANG, Yan
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 2009; Springer Singapore
• Subjects: Applied and Technical Physics; Engineering; grain refinement strengthening; Hall-Petch equation; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; nickel-free high nitrogen austenitic stainless steel; nitrogen; Physical Chemistry; Processes; 力学性能; 屈服应力; 显微组织; 晶粒尺寸; 粒度范围; 高氮奥氏体不锈钢; nickel-free high nitrogen austenitic stainless steel; Hall-Petch equation; grain refinement strengthening; nitrogen
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(09)60011-X

The fine grained structures of nickel-free high nitrogen austenitic stainless steels had been obtained by means of cold rolling and subsequent annealing. The relationship between microstructure and mechanical properties and gain size of nickel-free high nitrogen austenitic stainless steels was examined. High strength and good ductility of the steel were found. In the grain size range, the Hall-Petch dependency for yield stress, tensile strength, and hardness was valid for grain size ranges for the nickel-free high nitrogen austenitic stainless steel. In the present study, the ductility of cold rolled nickel-free high nitrogen austenitic stainless steel decreased with annealing time when the grain size was refined. The fracture surfaces of the tensile specimens in the grain size range were covered with dimples as usually seen in a ductile fracture mode.