CN110846589B - 一种用于模具的材料粉末及模具材料制备方法 - Google Patents
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Abstract
本发明公开了一种用于模具的材料粉末,采用水气联合雾化工艺制备,粉末成分质量百分比如下:C为0.3%或0.4%,Cr为5.1%或5.5%,V为6.5%或9%,Mo为1%或1.5%,剩余量为Fe。本发明还公开了一种模具材料制备方法,使用上述粉末;采用分解氨气氛进行粉末预处理;将预处理后粉末用压制成型或冷等静压成型,得成型后坯料;将成型后坯料进行预烧结处理;预烧结后用无包套热等静压致密化或用小变形量锻造致密化。本模具材料晶粒细小、碳化物均匀,可提升模具的耐磨性、耐高温性,致密度高,从而能增强模具的疲劳性能;另外本模具材料制备方法可减少锻造次数,缩短工艺流程,采用无包套热等静压时可降低工艺成本。
Description
技术领域
本发明涉及模具技术领域,具体涉及一种用于模具的材料粉末及模具材料制备方法。
背景技术
现有模具材料主要是通过铸造-锻造工艺制备,由于高合金模具材料在冶金凝固过程中,会出现晶粒粗大、碳化物粗大等情况,使得模具材料耐磨性、耐高温性能下降,从而降低了疲劳性能,容易导致模具断裂失效。
发明内容
有鉴于此,本发明期望提供一种用于模具的材料粉末及模具材料制备方法,该模具材料晶粒细小、碳化物均匀,致密度高,从而能增强疲劳性能,延长模具使用周期;另外本发明模具材料制备方法可减少锻造次数,缩短工艺流程,采用无包套热等静压时可降低工艺成本。
为达到上述目的,本发明提供了一种用于模具的材料粉末,所述材料粉末采用水气联合雾化工艺制备,所述粉末成分质量百分比如下:C为0.3%或0.4%,Cr为5.1%或5.5%,V为6.5%或9%,Mo为1%或1.5%,剩余量为Fe。
本发明还提供了一种模具材料制备方法,使用上述材料粉末,包括以下步骤:
a)采用水气联合雾化工艺制备材料粉末,所述粉末成分质量百分比:C为0.3%或0.4%,Cr为5.1%或5.5%,V为6.5%或9%,Mo为1%或1.5%,剩余量为Fe;
b)采用分解氨气氛进行所述粉末预处理,预处理温度为500℃~950℃,预处理时间为2h~5h;
c)将所述预处理后的粉末采用压制成型或者冷等静压成型,得成型后的坯料,压制压力≥600MPa,冷等静压压力≥200MPa;
d)将所述成型后的坯料进行预烧结处理,所述预烧结处理包括两个阶段,第一阶段采用氮气气氛烧结,第二阶段采用真空烧结,真空度≤10-1Pa;第一阶段烧结以5℃/min~10℃/min升温速率从室温开始至1000℃~1100℃,停留1h~2h;第二阶段烧结以第一阶段烧结温度为起点,按3℃/min~5℃/min升温速率至1000℃~1260℃,停留1h~2h;
e)所述预烧结处理后采用无包套热等静压致密化或者采用小变形量锻造致密化,得最终模具材料;所述无包套热等静压温度范围为900℃~1100℃,压力≥100MPa,保温保压2h;所述锻造温度范围为1000℃~1200℃。
优选地,所述步骤b)中预处理温度为650℃或800℃或950℃。
优选地,所述步骤c)中压制压力为650MPa或700MPa,所述冷等静压压力为200MPa。
优选地,所述步骤e)中无包套热等静压温度为1050℃或者1100℃,压力为100MPa或150MPa。
本发明有益效果如下:本发明模具材料晶粒细小、碳化物均匀,可提升模具的耐磨性、耐高温性,致密度高,从而能增强疲劳性能,延长模具使用周期;另外本发明模具材料制备方法可减少锻造次数,缩短工艺流程,采用无包套热等静压时可降低工艺成本。
具体实施方式
为了能够更加详尽地了解本发明的特点与技术内容,下面对本发明的实现进行详细阐述。
本发明一种用于模具的材料粉末,所述材料粉末采用水气联合雾化工艺制备,所述粉末成分质量百分比如下:C为0.3%或0.4%,Cr为5.1%或5.5%,V为6.5%或9%,Mo为1%或1.5%,剩余量为Fe。
本发明还提供了一种模具材料制备方法,使用上述材料粉末,包括以下步骤:
a)采用水气联合雾化工艺制备材料粉末,所述粉末成分质量百分比:C为0.3%或0.4%,Cr为5.1%或5.5%,V为6.5%或9%,Mo为1%或1.5%,剩余量为Fe;
b)采用分解氨气氛进行所述粉末预处理,预处理温度为500℃~950℃,预处理时间为2h~5h;
这里,步骤b)可以去除粉末表面氧、同时形成微量氮化钒;
c)将所述预处理后的粉末采用压制成型或者冷等静压成型,得成型后的坯料,压制压力≥600MPa,冷等静压压力≥200MPa;
d)将所述成型后的坯料进行预烧结处理,所述预烧结处理包括两个阶段,第一阶段采用氮气气氛烧结,第二阶段采用真空烧结,真空度≤10-1Pa;第一阶段烧结以5℃/min~10℃/min升温速率从室温开始至1000℃~1100℃,停留1h~2h;第二阶段烧结以第一阶段烧结温度为起点,按3℃/min~5℃/min升温速率至1000℃~1260℃,停留1h~2h;
e)所述预烧结处理后采用无包套热等静压致密化或者采用小变形量锻造致密化,得最终模具材料;所述无包套热等静压温度范围为900℃~1100℃,压力≥100MPa,保温保压2h;所述锻造温度范围为1000℃~1200℃。
优选地,所述步骤b)中预处理温度为650℃或800℃或950℃。
优选地,所述步骤c)中压制压力为650MPa或700MPa,所述冷等静压压力为200MPa。
优选地,所述步骤e)中无包套热等静压温度为1050℃或者1100℃,压力为100MPa或150MPa。
实施例1
a)采用水气联合雾化工艺制备材料粉末,粉末成分质量百分比:C为0.3%,Cr为5.1%,V为6.5%,Mo为1%,剩余量为Fe;
b)采用分解氨气氛进行粉末预处理,预处理温度为650℃,预处理时间为5h;
c)将预处理后的粉末采用压制成型,得成型后的坯料,压制压力为650MPa;
d)将所述成型后的坯料进行预烧结处理,预烧结处理包括两个阶段,第一阶段采用氮气气氛烧结,第二阶段采用真空烧结,真空度为0.6*10-1Pa;第一阶段烧结以10℃/min的升温速率从室温25℃开始至1000℃,停留2h;第二阶段烧结温度按3℃/min的升温速率从1000℃开始至1250℃,停留1h;测得预烧结处理后的致密度达到95%;
e)预烧结处理后采用无包套热等静压致密化,无包套热等静压温度为1100℃,压力为100MPa,保温保压2h,得最终模具材料,测得致密化处理后的最终致密度达到99.6%。
实施例2
a)采用水气联合雾化工艺制备材料粉末,粉末成分质量百分比:C为0.4%,Cr为5.5%,V为9%,Mo为1.5%,剩余量为Fe;
b)采用分解氨气氛进行粉末预处理,预处理温度为800℃,预处理时间为3h;
c)将预处理后的粉末采用冷等静压成型,得成型后的坯料,冷等静压压力为200MPa;
d)将所述成型后的坯料进行预烧结处理,预烧结处理包括两个阶段,第一阶段采用氮气气氛烧结,第二阶段采用真空烧结,真空度0.7*10-1Pa;第一阶段烧结以8℃/min的升温速率从室温25℃开始至1050℃,停留1.5h;第二阶段烧结温度按3.5℃/min的升温速率从1050℃开始至1200℃,停留1.5h;测得预烧结处理后的致密度达到96%;
e)预烧结处理后采用小变形量(15%)锻造致密化,锻造温度为1100℃,得最终模具材料,测得致密化处理后的最终致密度达到99.5%。
各个实施例中的预烧结致密度和最终致密度如表1所示。
表1预烧结密度和最终致密度
由表1中各实施例测得数据可知,本发明预烧结处理后的致密度以及致密化处理后的最终致密度都高,能够增强模具材料的疲劳性能,延长模具使用周期。
本发明模具材料制备方法可使模具材料晶粒细小、碳化物均匀,这样可提升模具材料的耐磨性、耐高温性,从而能够增强模具材料的疲劳性能,延长模具使用周期。
另外本发明模具材料制备方法减少了现有技术锻造次数,缩短了工艺流程,采用本发明无包套热等静压时降低了工艺成本。
以上所述,仅为本发明的较佳实施例,并非用于限定本发明的保护范围,故凡依照本发明专利范围所做的等效变化或修饰,均属于本发明专利权利要求范围内。
Claims (4)
1.一种模具材料制备方法,其特征在于,包括以下步骤:
a) 采用水气联合雾化工艺制备材料粉末,所述粉末成分质量百分比:C为0.3%或0.4%,Cr为5.1%或5.5%,V为6.5%或9%,Mo为1%或1.5%,剩余量为Fe;
b) 采用分解氨气氛进行所述粉末预处理,预处理温度为500℃~950℃,预处理时间为2h~5h;
c) 将所述预处理后的粉末采用压制成型或者冷等静压成型,得成型后的坯料,压制压力≥600MPa,冷等静压压力≥200MPa;
d) 将所述成型后的坯料进行预烧结处理,所述预烧结处理包括两个阶段,第一阶段采用氮气气氛烧结,第二阶段采用真空烧结,真空度≤10-1Pa;第一阶段烧结以5℃/min~10℃/min升温速率从室温开始至1000℃~1100℃,停留1h~2h;第二阶段烧结以第一阶段烧结温度为起点,按3℃/min ~5℃/min升温速率至1000℃~1260℃,停留1h~2h;
e) 所述预烧结处理后采用无包套热等静压致密化或者采用小变形量锻造致密化,得最终模具材料;所述无包套热等静压温度范围为900℃~1100℃,压力≥100MPa,保温保压2h;所述锻造温度范围为1000℃~1200℃。
2.根据权利要求1所述的一种模具材料制备方法,其特征在于,所述步骤b)中预处理温度为650℃或800℃或950℃。
3.根据权利要求1所述的一种模具材料制备方法,其特征在于,所述步骤c)中压制压力为650 MPa或700 MPa,所述冷等静压压力为200MPa。
4.根据权利要求1所述的一种模具材料制备方法,其特征在于,所述步骤e)中无包套热等静压温度为1050℃或者1100℃,压力为100MPa或150MPa。
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