摘要
渗碳是一种重要的化学热处理工艺,为缩短渗碳时间,节省渗剂并精确控制其反应过程,以达到化学热处理高效、节能、高质量的目的。本文通过基础理论分析以及大量实验,确定了一种甲醇+丙烷+空气的渗碳体系。该渗碳介质具有可控性和稳定性,并且具有碳沉积速率快等特点。通过经典的扩散原理和理论计算,得出一种新的快速渗碳技术-循环变温渗碳技术。并通过20钢常规渗碳880℃×9 h与低温880℃×1 h和高温930℃×0.5 h交替循环变温渗碳9 h对比,结果表明,渗碳时间相同,循环变温渗碳工艺相比于常规渗碳,具有更高的渗速,从而确定了循环变温渗碳工艺的可实现性和可操作性。
Carburizing is an important chemical heat treatment process. The objective of chemical heat treatment with high efficiency, energy saving and high quality can be achieved by shortening the carburizing time, saving carburizing agent and accurately controlling the reaction process. In this paper, a kind of carburizing system of methanol, propane and air is determined by basic theory analysis and experiments. These new carburizing medium has the characteristics sach as controllability and stability, and rapid carbon deposition rate and so on. Through the classical diffusion principle and theoretical calculation, the new rapidly carburizing technology with cyclic changing temperature carburizing is obtained. Two kinds of process of 20 steel i. e. , the conventional carburizing at 880 -C for 9 h and the cyclic changing tempera- ture carburizing for 9 h that is the alternant cyclic transformation at low carburizing temperature 880℃ for 1 h and at high carburizing temperature 930 % for 0.5 h are compared. The results show that in the same carburizing time,the cyclic changing temperature carburizing technology has higher rate than the conven- tional carburization, so as to determine the feasibility and operability.
出处
《热处理技术与装备》
2017年第2期35-38,共4页
Heat Treatment Technology and Equipment
关键词
循环变温渗碳
20钢
渗碳介质
carburizing process of cyclic changing temperature
20 steel
carburizing medium
