龙坚战
,
夏艳萍
,
陈冲
,
陆必志
,
易茂中
,
武文花
中国有色金属学报
为开发新型TiC基钢结硬质合金,采用Fe2Al5预合金粉末添加方式和普通液相烧结法制备不同Al含量(占粘结相含量的O、0.77％、1.54％、2.3％,质量分数)的TiC-65％(Fe-Cr-Mo-Al-C)钢结硬质合金.探讨Al含量对TiC-65％(Fe-Cr-Mo-A1-C)钢结硬质合金的组织与性能的影响规律;并考察Al含量对合金的烧结性、相种类及硬度的影响规律.结果表明:随Al含量的增加,Fe-C合金的包晶反应温度点降低,包晶反应区间、BCC铁素体区和低温区的κ-碳化物沉淀区扩大;合金的硬质相TiC形貌及分布相近,且Al主要是溶解在粘结相中;合金的铁磁性与粘结相中奥氏体数量有关,随Al含量的增加,淬火+回火态合金的硬度增加;其断裂韧性、抗弯强度在Al含量为1.54％时达到峰值.
关键词:
TiC
,
钢结硬质合金
,
Fe-Al-C
,
组织
,
性能
Weiyan LÜ
,
Lin LI
,
Li WANG
,
Yanlin HE
,
Shuigen HUANG
材料科学技术（英文）
Phase diagram information of the Fe-C, Fe-Al and Al-C systems are reviewed and the Fe-Al-C system is assessed. A FeAlC database is created by combining a set of thermodynamic parameters established by Kumar and SSOL database in Thermo-Calc software package. Ternary phase diagrams are calculated with FeAlC and the newly developed Thermo-Calc databases SSOL2 and SSOL4. The FeAlC database is the best one to describe the Fe-Al-C system. A1 and A3 values on the vertical section containing 1.5 wt pct Al are calculated with the FeAlC database in this work. To validate the thermodynamic calculation, critical temperatures Ac1 and Ac3 are determined by using dilatometer analysis. There exist some errors between the calculated values and the experimental results. So further optimization of the Fe-Al-C system regarding bcc and fcc phases is necessary. The experimental data in this work could be of some value in further optimization.
关键词:
Fe-Al-C
,
null
,
null
