摘要
研究了回火工艺对新型贝氏体铸钢组织和性能的影响。结果表明,ZG30CrMn2Si2Mo正火低温回火后的组织是由贝氏体铁素体和残余奥氏体组成的新型贝氏体组织,随回火温度的升高和保温时间的延长,组织由新型贝氏体组织逐渐转变为典型贝氏体组织;250℃×1h回火后,材料具有较好的强韧性配合,在450￣550℃回火出现回火脆性,其原因与回火过程中残余奥氏体和贝氏体铁素体的分解、碳化物析出有关。
The influence of tempering process on microstmcture and mechanical properties of new type bainite cast steel was studied. The results show, after normalized and tempered at low temperature, the microstmcture of ZG30CrMn2Si2Mo cast steel is a new type bainite which consists of bainite ferrite and retained austenite , and its microstmcture transforms into the typical bainite from new type of bainite with the increase of tempering temperature and holding time. The experimental material has better matching of strength and toughness after tempered at 250℃ for 1 hour and temper brittleness occurs at 450-550℃, the reason of which is related to bainite ferrite and retaidual austenite decomposing for carbide.
出处
《热加工工艺》
CSCD
北大核心
2006年第22期58-60,共3页
Hot Working Technology
关键词
新型贝氏体铸钢
回火工艺
组织
性能
new type bainite casting steel
tempering process
microstmcture
property
