加热工艺对轴承钢连铸坯液析碳化物溶解行为的影响Influence of heating process on dissolve behavior of liquation carbide in casting bearing steel
左毅,米振莉,李志超,李辉
摘要(Abstract):
利用DICTRA软件及金相法对GCr15轴承钢连铸坯中的液析碳化物在加热工艺中的溶解与扩散机理进行研究,并针对常规加热工艺存在的问题,提出加热工艺的设计思路:第一阶段在液析严重区域连铸坯的固相线温度以下进行加热,加热过程中仅发生液析碳化物的溶解,令C元素快速扩散,同时该区域固相线温度逐渐升高;第二阶段在1200~1280℃的高温区进行加热,由于第一阶段中液析严重区域连铸坯的固相线温度升高,此时很难再有液相增加,可保证Cr元素快速扩散,最终令液析碳化物快速溶解扩散。根据DICTRA软件对加热工艺的模拟计算结果,设计加热工艺为"1100℃加热1 h后1250℃加热1 h"。以该工艺对试样进行加热试验,液析碳化物级别由4.0级降低至0.5级,结果证明了该加热工艺的可行性。
关键词(KeyWords): 轴承钢;连铸坯;液析碳化物;加热工艺
基金项目(Foundation): 中央高校基本科研业务费专项奖金资助(新教师基金TPA3类,编号:FRF-TP-15-063A3)
作者(Author): 左毅,米振莉,李志超,李辉
DOI: 10.13289/j.issn.1009-6264.2016.02.025
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