摘要
通过Gleeble-3800热模拟对塑料模具钢718连铸坯进行了高温塑性研究,并采用扫描电镜观察了不同温度下718钢的断口形貌,分析了不同温度区域的断裂机理。结果表明,718模具钢第Ⅰ脆性区(1 300~1 350℃)主要是受液相影响,呈现熔断现象,第Ⅱ脆性区(950~1 275℃)断裂部位呈现韧窝状,表现较好的塑性,第Ⅲ脆性区(600~900℃)断口形貌凸凹不平,存在孔洞,断裂周围基本没有发生塑性变形,塑性较差。根据高温塑性结果优化了连铸工艺参数,并进行了试生产,消除了铸坯表面横裂纹。
The high temperature plasticity of 718 plastic mold steel was investigated on a Gleeble-3800 thermal simulator,and the fracture morphology of 718 steel at different temperatures was observed by scanning electron microscope,analyzed the fracture mechanisms in different temperature. The results showed that 718 plastic mold steel brittle zoneⅠ( 1 300~ 1 350 ℃) is mainly affected by the liquid phase with fusing phenomenon;the fractures at brittle zone Ⅱ( 950 ~1 275 ℃) was presented toughening with good plasticity;the fractures at brittle zone Ⅲ( 600 ~ 900 ℃) was roughness,had subsidence holes,around the fracture had no plastic deformation,with low plasticity. According to high temperature plasticity results optimized the continuous casting process parameters,performed trial production,and eliminated transverse crack on the slab surface.
作者
廖桑桑
邹苏华
李声延
Liao Sangsang;Zou Suhua;Li Shengyan(Xinyu Iron and Steel Group Co. Ltd)
出处
《河南冶金》
2019年第3期8-10,共3页
Henan Metallurgy
关键词
718塑料模具钢
高温塑性
断裂机理
试生产
718 plastic mold steel
high temperature plastic
fracture mechanism
pilot production
