Friction welding of a nickel free high nitrogen steel: influence of forge force on microstructure, mechanical properties and pitting corrosion resistance

Journal of Materials Research and Technology

Mrityunjoy Hazra¹  Gankidi Madhusudhan Reddy¹  Kotipalli Srinivasa Rao² 

[1] Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad, India;Department of Metallurgical Engineering, College of Engineering, Andhra University, Visakhapatnam, India;

关键词: High nitrogen steel (HNS);    Friction welding;    Forge force;    Impact toughness;    Tensile strength;    Pitting corrosion resistance;   

DOI  :  10.1016/j.jmrt.2013.12.001

来源: DOAJ

【 摘 要 】

In the present work, nickel free high nitrogen austenitic stainless steel specimens were joined by continuous drive friction welding process by varying the amount of forge (upsetting) force and keeping other friction welding parameters such as friction force, burn-off, upset time and speed of rotation as constant at appropriate levels. The joint characterization studies include microstructural examination and evaluation of mechanical (micro-hardness, impact toughness and tensile) and pitting corrosion behaviour. The integrity of the joint, as determined by the optical microscopy was very high and no crack and area of incomplete bonding were observed. Welds exhibited poor Charpy impact toughness than the parent material. Toughness for friction weld specimens decreased with increase in forge force. The tensile properties of all the welds were almost the same (irrespective of the value of the applied forge force) and inferior to those of the parent material. The joints failed in the weld region for all the weld specimens. Weldments exhibited lower pitting corrosion resistance than the parent material and the corrosion resistance of the weld specimens was found to decrease with increase in forge force.

【 授权许可】

Unknown