新型TiC钢结硬质合金致密化技术

Densification processing of a new steel bonded titanium carbide

采用行星式球磨机对Fe-3.0Cr-3.0Mo-0.5Cu-0.5C-33TiC新型钢结硬质合金混合粉末进行高能球磨,对烧结后的合金进行热等静压和锻造处理,研究球磨时间、热等静压及锻造工艺对合金组织、性能及孔隙度的影响。研究结果表明:高能球磨使粉末细化和成分均匀化,促进烧结进程,随球磨时间的延长,合金组织细化且致密;热等静压和锻造工艺可进一步减小和消除合金中烧结后残留的孔洞等缺陷;锻造作为最后工艺,可使TiC颗粒之间的连接破碎,促使硬质相颗粒弥散分布,从而改善烧结组织,提高合金的致密性及力学性能。

The Fe-3.0Cr-3.0Mo-0.5Cu-0.5C-33TiC mixed powders were prepared by high energy ball milling in a planetary ball mill. The sintered alloy was treated by HIP （hot isostatic pressing） and forging. The effect of ball milling time, HIP and forging on the microstructure, properties and porosity of alloy was studied. The results show that high energy ball milling refines and homogenizes the mixed powders, accelerates the sintering process, and with the increase of milling time, the grain is finer and the alloy is denser. HIP and forging is beneficial to decrease or remove the pole formed during the sinter course, and as the last process, forging breaks the junctions between TiC particles, the microstructure and mechanical properties of alloy are improved.