CN107761043A - 一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法 - Google Patents
一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法 Download PDFInfo
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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Abstract
一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,本发明涉及一种提高G13Cr4Mo4Ni4V钢耐磨性的方法。本发明是要解决常规渗碳热处理后产品在污染环境下耐磨性能差的问题。方法:将G13Cr4Mo4Ni4V钢进行三次渗碳处理,再进行扩散、淬火和回火。本发明用于提高G13Cr4Mo4Ni4V钢耐磨性。
Description
技术领域
本发明涉及一种提高G13Cr4Mo4Ni4V钢耐磨性的方法。
背景技术
8Cr4Mo4V钢具有高强度、高硬度、耐高温性,高的尺寸稳定性及高接触疲劳强度,是目前航空发动机主轴轴承应用最广泛的材料,然而由于该材料是由全淬透马氏体组织构成,存在韧性低、缺口敏感特性,且该材料存在较大的一次碳化物,上述问题降低了材料的振动疲劳性能和接触疲劳性能,特别是一次碳化物存在降低了轴承的可靠性,因此该材料的应用范围为dn值≤2.4×106,内圈不能进行大的过盈装配。该材料不适用于发动机一体化的设计和加工,特别是在目前具有弹支的发动机主轴轴承上无法实现,因此该材料已经不能完全满足4、5代发动机对轴承的使用要求。
G13Cr4Mo4Ni4V钢经过渗碳热处理后,零件的表面硬度高,心部硬度相对较低,使零件在具有高的冲击韧性的同时,具有了高硬度、高耐温性能、高尺寸稳定性和高接触疲劳寿命,该材料适用于dn值>2.4×106的工况,适用于发动机与轴承的一体化发展要求,适用于4、5代发动机上应用弹支结构的轴承加工。另外与8Cr4Mo4V材料比较,G13Cr4Mo4Ni4V钢材料中,没有较大尺寸的一次碳化物存在,因此,不仅可以显著的提高轴承的接触疲劳性能,也能显著的增强轴承的可靠性,是4、5代发动机轴承的首选材料。
但该材料采用常规渗碳热处理方式加工的轴承,存在耐磨性低,特别是在受污染的环境下的轴承尤为突出,为了解决上述问题,目前采用的方法是在轴承套圈的引导面涂TiN,在滚道表面涂DLC以及滚道表面进行离子注入或进行渗氮处理,其目的均是为了提高轴承的耐磨性。上述方法虽然解决了耐磨性问题,但也带来了加工上的难题,如TiN涂层结合力不足、TiN涂层可能脱落;离子注入层较浅、使用过程中离子也可能移出、对轴承受的剪切应力作用次表面的疲劳问题无法解决;DLC也存在结合力不足,易从表面脱落的问题,渗氮可以显著提升硬度、提高耐磨性,但存在加工难度大,质量控制困难,磨削加工时易出现裂纹,组织控制不理想,产品在使用过程中易出现裂纹等问题。
发明内容
本发明目的是为了解决常规渗碳热处理后产品在污染环境下耐磨性能差的问题,而提供一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法。
本发明一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法具体是按以下步骤进行:
一、一次渗碳:在温度为880℃~980℃的条件下对G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间12h~25h;
二、二次渗碳:在温度为880℃~980℃的条件下对一次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为12h~25h;
三、三次渗碳:在温度为880℃~980℃的条件下对二次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为12h~25h;
四、扩散:在温度为880℃~980℃的条件下对三次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳扩散,渗碳扩散时间为12h~25h;
五、淬火:渗碳扩散后将温度从880℃~980℃升温至1090℃~1120℃,将渗碳扩散后的G13Cr4Mo4Ni4V钢在温度为1090℃~1120℃的条件下淬火0.5h~1h;
六、回火:将淬火后的G13Cr4Mo4Ni4V钢在温度为550℃的条件下回火三次,每次4h,即完成提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理;渗碳热处理后G13Cr4Mo4Ni4V钢表面的渗碳层深度大于1mm,渗碳层碳浓度为1%~1.5%。
本发明的有益效果:
本发明在常规渗碳条件下进行再渗碳,通过提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理技术,使表面形成高碳浓度、碳浓度分布梯度合理、碳化物数量多、碳化物尺寸相对大,达到显著提高硬度、耐磨性,特别是提高在污染环境下的耐磨性。解决常规渗碳热处理产品耐磨性能差的问题,从而提高轴承的性能、寿命及可靠性,并满足4、5代发动机对主轴轴承的使用要求。
具体实施方式
具体实施方式一:本实施方式一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法具体是按以下步骤进行:
一、一次渗碳:在温度为880℃~980℃的条件下对G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间12h~25h;
二、二次渗碳:在温度为880℃~980℃的条件下对一次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为12h~25h;
三、三次渗碳:在温度为880℃~980℃的条件下对二次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为12h~25h;
四、扩散:在温度为880℃~980℃的条件下对三次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳扩散,渗碳扩散时间为12h~25h;
五、淬火:渗碳扩散后将温度从880℃~980℃升温至1090℃~1120℃,将渗碳扩散后的G13Cr4Mo4Ni4V钢在温度为1090℃~1120℃的条件下淬火0.5h~1h;
六、回火:将淬火后的G13Cr4Mo4Ni4V钢在温度为550℃的条件下回火三次,每次4h,即完成提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理;渗碳热处理后G13Cr4Mo4Ni4V钢表面的渗碳层深度大于1mm,渗碳层碳浓度为1%~1.5%。
具体实施方式二:本实施方式与具体实施方式一不同的是:步骤一中在温度为880℃~945℃的条件下对G13Cr4Mo4Ni4V钢进行渗碳处理。其他与具体实施方式一相同。
具体实施方式三:本实施方式与具体实施方式一或二不同的是:步骤一中所述渗碳时间为20h。其他与具体实施方式一或二相同。
具体实施方式四:本实施方式与具体实施方式一至三之一不同的是:步骤二中在温度为880℃~945℃的条件下对一次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理。其他与具体实施方式一至三之一相同。
具体实施方式五:本实施方式与具体实施方式一至四之一不同的是:步骤二中所述渗碳时间为20h。其他与具体实施方式一至四之一相同。
具体实施方式六:本实施方式与具体实施方式一至五之一不同的是:步骤三中在温度为880℃~945℃的条件下对二次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理。其他与具体实施方式一至五之一相同。
具体实施方式七:本实施方式与具体实施方式一至四之一不同的是:步骤三中所述渗碳时间为20h。其他与具体实施方式一至四之一相同。
采用以下实施例验证本发明的有益效果:
实施例一:一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法具体是按以下步骤进行:
一、一次渗碳:在温度为945℃的条件下对G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间20h;
二、二次渗碳:在温度为945℃的条件下对一次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为20h;
三、三次渗碳:在温度为945℃的条件下对二次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为20h;
四、扩散:在温度为945℃的条件下对三次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳扩散,渗碳扩散时间为20h;
五、淬火:渗碳扩散后将温度从945℃升温至1100℃,将渗碳扩散后的G13Cr4Mo4Ni4V钢在温度为1100℃的条件下淬火1h;
六、回火:将淬火后的G13Cr4Mo4Ni4V钢在温度为550℃的条件下回火三次,每次4h,即完成提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理;渗碳热处理后G13Cr4Mo4Ni4V钢表面的渗碳层深度大于1mm,渗碳层碳浓度为1%~1.5%。
经本实施例处理后渗碳层硬度大于60HRC。
Claims (7)
1.一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法具体是按以下步骤进行:
一、一次渗碳:在温度为880℃~980℃的条件下对G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间12h~25h;
二、二次渗碳:在温度为880℃~980℃的条件下对一次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为12h~25h;
三、三次渗碳:在温度为880℃~980℃的条件下对二次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理,渗碳时间为12h~25h;
四、扩散:在温度为880℃~980℃的条件下对三次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳扩散,渗碳扩散时间为12h~25h;
五、淬火:渗碳扩散后将温度从880℃~980℃升温至1090℃~1120℃,将渗碳扩散后的G13Cr4Mo4Ni4V钢在温度为1090℃~1120℃的条件下淬火0.5h~1h;
六、回火:将淬火后的G13Cr4Mo4Ni4V钢在温度为550℃的条件下回火三次,每次4h,即完成提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理;渗碳热处理后G13Cr4Mo4Ni4V钢表面的渗碳层深度大于1mm,渗碳层碳浓度为1%~1.5%。
2.根据权利要求1所述的一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于步骤一中在温度为880℃~945℃的条件下对G13Cr4Mo4Ni4V钢进行渗碳处理。
3.根据权利要求1所述的一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于步骤一中所述渗碳时间为20h。
4.根据权利要求1所述的一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于步骤二中在温度为880℃~945℃的条件下对一次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理。
5.根据权利要求1所述的一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于步骤二中所述渗碳时间为20h。
6.根据权利要求1所述的一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于步骤三中在温度为880℃~945℃的条件下对二次渗碳后的G13Cr4Mo4Ni4V钢进行渗碳处理。
7.根据权利要求1所述的一种提高G13Cr4Mo4Ni4V钢耐磨性的渗碳热处理方法,其特征在于步骤三中所述渗碳时间为20h。
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