车继虎,王祥龙,张超,张志坚,胡保珠,樊晨翔,孟瑜,刘明霞

• 1:陕西彬长矿业集团有限公司
• 2:陕西天元智能再制造股份有限公司
• 3:西安文理学院陕西省表面工程与再制造重点实验室

摘要(Abstract)：

采用激光熔覆(LC)技术在17-4PH不锈钢基体表面制备了Cr18型Fe基熔覆涂层，并对涂层进行激光重熔(LR)处理，利用无损渗透检测(PT)、光学显微镜(OM)、扫描电镜(SEM)、残余应力仪、X射线衍射仪(XRD)、浸泡试验及电化学工作站等表征了重熔前后熔覆层的宏/微观结构及耐蚀性能，并利用Comsol软件模拟激光熔覆和激光重熔过程中熔覆层的热场分布。结果表明：经过激光重熔后的Cr18型Fe基熔覆涂层未发现裂纹、气孔等缺陷，表面形貌平整且晶粒显著细化，物相主要由Fe-Cr铁素体和Fe-Ni奥氏体两相构成；激光重熔处理后，发生了奥氏体(γ)向铁素体(α)的相变，且涂层表面的Cr元素分布趋于均匀；与重熔前相比，激光重熔处理后涂层的自腐蚀电位E_(corr)从-0.322 mV增大至-0.269 mV,自腐蚀电流密度i_(corr)从6.85×10~(-8) A·cm~(-2)降低至4.33×10~(-8) A·cm~(-2),耐蚀性能得到显著提升；激光重熔处理后，涂层表面的残余压应力由-443 MPa降低至-294 MPa,残留奥氏体含量由62.0%降低至27.6%;模拟发现，重熔过程中涂层表面温度梯度显著高于涂层内部，导致涂层近表面奥氏体向铁素体转变，表层组织转变、晶粒细化及Cr元素的均匀分布有利提升了涂层的耐蚀性能。

关键词(KeyWords)： 激光熔覆;激光重熔;双相不锈钢;微观组织;耐蚀性;晶粒细化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金(52101097);; 陕西省自然科学基础研究计划项目(2023KJXX-068,2022CGBX-13,2022JM-253,2025SYS-SYSZD-067);; 西安市科技计划项目(21XJZZ0069);; 陕西省表面工程与再制造重点试验室开放基金(2022SSER01)

作者(Author): 车继虎,王祥龙,张超,张志坚,胡保珠,樊晨翔,孟瑜,刘明霞

DOI: 10.13289/j.issn.1009-6264.2024-0510

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