碳素铆螺钢α+γ双相区固溶碳活度的计算  

Calculation of solid solution carbon activity in carbon steel for cold forming dual-phases region α+γ

作　　者：曾春霖 顾剑锋[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]江苏金火炬金属制品有限公司,江苏盐城224023

出　　处：《金属制品》2017年第3期26-33,共8页Metal Products

摘　　要：在球化退火炉气氛控制中,固溶碳活度的计算成为气氛是否获得有效控制的关键。验证了以往研究者发表的铁素体与奥氏体固溶碳活度模型。结果表明,在吸热式可控气氛球化退火的条件下,选择碳素铆螺钢α+γ双相组织中固溶碳活度的计算模型时,α固溶碳活度模型计算结果的可靠性较低,且除了a_C~γ=w_(C,pe)~γ/w_(C,ps)~γ以外其余的γ固溶碳活度模型均不适于A_1附近温度时的活度计算。In atmosphere control of spheroidizing annealing, calculation of carbon activity in solid solution is the key whether atmosphere gets effective control. The ferrite and austenite solid solution carbon activity model published by previous researchers is confirmed. Results show that under endothermie type controlled atmosphere spheroidizing annealing, select solid solution carbon activity calculation model of carbon steel for cold forming α＋γ dual-phases structure, the reliability of activity model of carbon in α is insufficient, and activity models of carbon in γ are not suited to calculating of carbon activity near to Al temperature in addition to aC~γ=wC,pe~γ/wC,ps~γ.

关 键 词：铆螺钢 碳活度 球化退火 表面脱碳 铁素体 

分 类 号：TG142.31[一般工业技术—材料科学与工程]