The invention relates to a 1Cr9Mo1VNbN material steam turbine nozzle boriding method, relating to a steam turbine nozzle boriding method. The present invention aims at solving the technical problem that the boriding layer has longitudinal cracks perpendicular to the seepage layer, and the cracks penetrate through the entire seepage layer, resulting in unqualified quality of the boriding layer of the nozzle. The following methods: boronizing with workpieces heated to 745 DEG C + 10 3 + 0.5h, and then continue with the furnace heating up to 1000 + 10 DEG C, holding 10 + 0.5h, 8 ~ 10h after furnace cooling to 800 + 5 DEG C, followed by air cooling, then 700 + 10 DEG C tempering 5 + 0.5h, i.e. complete. When the depth and hardness of the nozzle boriding layer meet the requirements, no cracks occur, and the crack rate of the boride layer is increased to 100%. At the same time, the 1Cr9Mo1VNbN material is guaranteed to be air cooled in the two-phase zone of austenite and pearlite, and good mechanical properties are obtained, which greatly improves the work efficiency and saves energy.
【技术实现步骤摘要】
1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法
本专利技术涉及一种汽轮机喷嘴渗硼的方法。
技术介绍
1Cr9Mo1VNbN材质汽轮机高压一级喷嘴汽道部位需进行渗硼提高其表面硬度,提高耐磨性,耐固体粒子冲蚀从而延长喷嘴使用寿命。然而现有的渗硼工艺渗硼后,渗硼层有垂直于渗层的纵向裂纹,裂纹贯穿整个渗层,导致喷嘴渗硼层质量不合格。
技术实现思路
本专利技术是为了解决现有方法渗硼工艺后,渗硼层有垂直于渗层的纵向裂纹,裂纹贯穿整个渗层,导致喷嘴渗硼层质量不合格的技术问题,提供了一种1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法。1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法如下:将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至745±10℃保温3±0.5h,然后继续随炉升温至1000±10℃,保温10±0.5h,随炉经过8~10h冷却至800±5℃,出炉空冷,再700±10℃回火5±0.5h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。本专利技术的有益效果是:1Cr9Mo1VNbN材质汽轮机高压一级喷嘴采用新的渗硼工艺后,喷嘴渗硼层在层深和硬度满足要求的同时,不再有裂纹出现,将产品渗硼层裂纹合格率提高到100%。同时渗硼热处理工艺中升温至1000±10℃,保温10±0.5h,随炉经过8~10h冷却至800±5℃,再出炉空冷,保证了1Cr9Mo1VNbN材质在奥氏体和珠光体两相区出炉空冷,得到了机械性能良好的组织。采用本专利技术渗硼后1Cr9Mo1VNbN材质汽轮机喷嘴汽道表面获得硬度可达HV100g1359、层深为70-90μm的渗硼层,同时1Cr9Mo1VNb ...
【技术保护点】
1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法,其特征在于该方法如下:将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至745±10℃保温3±0.5h,然后继续随炉升温至1000±10℃,保温10±0.5h,随炉经过8~10h冷却至800±5℃,出炉空冷,再700±10℃回火5±0.5h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。
【技术特征摘要】
1.1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法,其特征在于该方法如下:将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至745±10℃保温3±0.5h,然后继续随炉升温至1000±10℃,保温10±0.5h,随炉经过8~10h冷却至800±5℃,出炉空冷,再700±10℃回火5±0.5h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。2.根据权利要求1所述1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法,其特征在于将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至735℃保温2.5h,然后继续随炉升温至990℃,保温9.5h,随炉经过8h冷却至795℃,出炉空冷,再690℃回火4.5h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。3.根据权利要求1所述1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法,其特征在于将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至738℃保温2.5h,然后继续随炉升温至992℃,保温9.8h,随炉经过8.2h冷却至798℃,出炉空冷,再695℃回火4.6h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。4.根据权利要求1所述1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法,其特征在于将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至739℃保温2.6h,然后继续随炉升温至995℃,保温10h,随炉经过8.5h冷却至800℃,出炉空冷,再700℃回火4.8h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。5.根据权利要求1所述1Cr9Mo1VNbN材质汽轮机喷嘴渗硼的方法,其特征在于将1Cr9Mo1VNbN材质汽轮机喷嘴工件随炉升温至740℃保温2.7h,然后继续随炉升温至998℃,保温10h,随炉经过9h冷却至801℃,出炉空冷,再701℃回火5h,即完成1Cr9Mo1VNbN材质汽轮机喷嘴渗硼。...
【专利技术属性】
技术研发人员:郭洁,唐公民,陈钊,宫伟兴,
申请(专利权)人:哈尔滨汽轮机厂有限责任公司,
类型:发明
国别省市:黑龙江,23
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。