"Understanding Recrystallization Behavior for Stable Mechanical Properties & Improved Yields "

oleh "Douglas G. Stalheim "

Penerbit - "DGS Metallurgical Solutions, Inc., Vancouver, WA USA "

Kategori - Kejuruteraan & IT

"As Southeast Asia continues the development of structural grade steels including higher strength and toughness grades, creating stable mechanical properties can be challenging. With statistical random sampling for mechanical testing, typically representing less than 30% of the production population, instability of mechanical properties can result in less than desirable material properties/characteristics being put into service. In addition, as unstable mechanical properties are created, product failures increase resulting in yield loss. Yield loss can be as high as 10% or more with higher strength and toughness grades creating significant cost losses. Proper understanding of the three recrystallization behaviors, how they are created and their role in creating mechanical properties is a fundamental key to proper production of stable mechanical properties and improved yields and costs. The three recrystallization behaviors determine the final transformed ferrite grain size which is the fundamental build block in creating the final metallurgy and hence final mechanical properties. Alloy, in particular niobium microalloy metallurgy, and process design drive which type or types of recrystallization behaviors that are created. In addition, the ability to control the recrystallization behaviors through the cross section is required for mechanical property stability. The three basic recrystallization behaviors are static recrystallization, metadynamic recrystallization and no-recrystallization. The percentage of each that is created of each and consistency from surface to center of the product determines the final mechanical properties and the stability of those properties. The three recrystallization behaviors are inter-connected and rely on each other in creating a fine grained cross section and stable mechanical properties. Understanding the role of alloy and process design and how to incorporate it into a given process is a key to success and optimum performance and cost.This paper will describe the three basic recrystallization behavior and their role in creating final mechanical properties. Alloy and process design will be described along with how the three behaviors are inter-connected. How to identify the behaviors through analysis of mill process parameters and how to adapt the natural processing and alloy design to achieve the desired results will be discussed. "

Sila login untuk meminjam buku.