Spheroidizing Kinetics and Optimization of Heat Treatment Parameters in CK60 Steel Using Taguchi Robust Design

作     者：Ata Kamyabi-Gol Meisam Sheikh-Amiri 

作者机构：Department of Chemical and Materials EngineeringUniversity of Alberta Department of Materials Science and Metallurgical EngineeringFerdowsi University of Mashhad 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2010年第17卷第4期

页      面：45-52页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：spheroidizing kinetics heat treatment CK60 Taguchi 

摘      要：For processing parts made from medium carbon steel, toughness and flexibility are of importance. There- fore, to achieve these properties, the cementite in the steels is spheroidized through heat treatment. Different parameters such as the time and temperature of spheroidizing and the initial microstructure of the steel affect the amount of spheroidized cementite. In the present work, the percent of contribution of two parameters, i.e. initial microstructure and spheroidizing time, to the percent of spheroidization in CK60 steel was investigated using Taguchi robust design. The initial microstructures consisted of martensite, coarse pearlite, fine pearlite and bainite and the chosen spheroidization times were 4, 8, 12, and 16h. Spheroidizing was done at the constant temperature 700℃. After spheroidizing was completed, the samples were prepared in order to observe their microstructure under an optical microscope and to determine the spheroidized percent using MIPTM （metallographic image processing） software. It was found that the spheroidizing time had the most influence （58.5 ~//0） on spheroidized percent and the initial microstructure only had a 31.1% contribution. Finally, the instantaneous growth rate of the carbide was also deduced.