QPQ盐浴复合处理对5CrMnMo钢的组织与性能影响

探讨了5CrMnMo钢的QPQ盐浴复合表面处理工艺,利用扫描电镜观察处理后的表层显微组织、检测氮化层厚度、分析氮化层质量;利用显微硬度计检测组织的显微硬度,并对不同的渗氮试样作磨损、耐腐蚀对比试验。结果表明:经QPQ处理的5CrMnMo钢具有组织均匀、结构致密的渗层,且具有很高的显微硬度、耐磨性以及强抗腐蚀性。     

3Cr2W8V模具钢激光熔凝＋渗氮复合处理的组织与耐磨性研究

采用横流CO2激光器对3Cr2W8V热作模具钢表面进行激光熔凝处理,然后对激光处理后的试样进行QPQ盐浴渗氮复合处理.用电子显微镜观察了复合处理后3Cr2W8V钢试样的金相组织,并通过划痕硬度试验和磨损试验测试了QPQ盐浴渗氮试样和经激光熔凝处理再进行QPQ盐浴渗氮试样的硬度和耐磨性.结果表明,经过激光熔凝处理的试样具有更好的渗氮效果,在渗氮时间相同的条件下,经激光熔凝处理冉进行QPQ盐浴渗氮复合处理的试样渗氮层更深,划痕硬度和耐磨性较未采用激光处理直接渗氮的试样都有较大幅度地提高,其中划痕硬度平均提高了15.6%,耐磨性平均提高了47.9%.预先激光熔凝再盐浴渗氮的复合处理工艺町以较大幅度地提高工件表面的耐磨性.     

QPQ盐浴复合处理对5CrMnMo钢的组织与性能影响

探讨了5CrMnMo钢的QPQ盐浴复合表面处理工艺，利用扫描电镜观察处理后的表层显微组织、检测氮化层厚度、分析氮化层质量；利用显微硬度计检测组织的显微硬度，并对不同的渗氮试样作磨损、耐腐蚀对比试验。结果表明：经QPQ处理的5CrMnMo钢具有组织均匀、结构致密的渗层，且具有很高的显微硬度、耐磨性以及强抗腐蚀性。     

稀土对模具钢QPQ渗层组织和性能的影响

研究了5CrNiMo模具钢经不同浓度稀土QPQ处理后的组织和性能,在QPQ处理过程中加入适量稀土化合物LaCO3对5CrNiMo钢进行表面改性处理。利用扫描电镜(SEM)分析了5CrNiMo处理后的表面金相显微组织和表面形貌、氮化层深度,采用401MVA型显微维氏硬度计测量试样显微硬度,在M-2000型磨损试验机上进行滑动磨损试验。结果表明,QPQ处理加入适量的稀土不仅有明显的催渗作用,而且能提高5CrNiMo钢的硬度及耐磨性。     

QPQ盐浴复合处理对H13钢组织及性能的影响

运用QPQ盐浴复合处理技术对H13钢进行表面强化处理,分析了不同工艺参数对氮化层深度、显微硬度和抗腐蚀性的影响及氮化层显微组织特征.结果表明,在相同的渗氮温度下,渗氮层的深度随渗氮时间的延长而增加,氮化后的材料硬度和耐腐蚀性较渗氮前有较大的提高,氮化3～4h效果最好.     

硼铸铁QPQ盐浴氮化的组织与性能研究

对硼铸铁分别在540、560、580℃下采用1.5、2.5、3.5、4.5 h的渗氮时间进行QPQ盐浴氮化处理,用电子显微镜观察了盐浴氯化后的金相组织,测试了氮化层厚度,并通过划痕硬度试验、显微硬度试验、耐腐蚀试验和磨损试验,测试了试样经QPQ盐浴氮化的硬度、耐腐蚀性和耐磨性.结果表明,随着氮化时间的增长和氮化温度的提高,氮化层厚度随之增加,硼铸铁经QPQ盐浴复合处理后试样表面形成高硬度、高耐磨性能的氮化物层,组织和性能稳定,表层硬度、耐腐蚀性和耐磨性明显提高.与未处理试样相比显微硬度提高了77.38%,耐磨性提高4.2倍,耐腐蚀性能提高600倍.QPQ盐浴氮化处理是提高硼铸铁硬度、耐磨性和使用寿命的有效手段.     

渗氮温度对Inconel 718合金磨损和腐蚀性能的影响

研究不同渗氮温度下QPQ处理对Inconel 718合金的耐磨性和防腐性能的影响。Inconel 718合金试样块采用QPQ复合盐浴处理技术,分别在590℃,620℃和650℃的渗氮温度下进行渗氮处理,然后均400℃氧化30min。利用摩擦磨损试验、电化学、X射线衍射仪、金相显微镜和显微维氏硬度计系统地研究了经不同渗氮温度下处理后改性表面层的相组成和性能特点。结果显示改性表面的微观结构和相组成与渗氮温度有关。随着渗氮温度的提高,不同厚度的渗氮层形成,且经处理后的Inconel 718合金的耐磨性得到极大的提高,且其显微硬度比未处理的大三倍。然而,由于CrN的形成造成了在表面渗氮层固溶体中Cr含量的减少,导致Inconel 718合金的耐腐蚀性较未处理的腐蚀性低。     

硼铸铁缸套QPQ盐浴复合处理的组织和性能研究

利用扫描电子显微镜(SEM)分析了硼铸铁缸套QPQ(淬火-抛光-淬火)处理后的表面形貌、氮化层深度;采用401MVA型显微维氏硬度计测量试样显微硬度;在M-2000型磨损试验机上进行滑动磨损试验;采用10%NaCl水溶液浸泡法对其进行抗蚀性测试。研究结果表明:硼铸铁经QPQ盐浴复合处理后,得到了一定厚度的白亮层和扩散层,使金属零部件表面形成高硬度、高耐磨性能的氮化物层,组织和性能稳定,表层显微硬度最高达到1010HV0.1,是基体显微硬度的3倍以上。耐磨性和抗腐蚀性较渗氮前都有大幅度提高。并用该工艺方法对硼铸铁缸套进行了批量生产,实际应用表明可使硼铸铁缸套使用寿命大大提高,易于推广应用。     

QPQ盐浴复合处理时间对304不锈钢耐磨性的影响

利用光学显微镜、X射线衍射仪、显微硬度计、摩擦磨损试验机研究了304不锈钢在565℃进行60 ～ 180 min盐浴复合处理(QPQ)后对304不锈钢表面组织和耐磨性性能的影响.结果表明,在565℃渗氮时间为150 min时,304不锈钢硬度峰值约为1200 HV,比基体高5倍以上.工件经QPQ工艺处理后试样钢渗层结构由表及里为致密的氧化膜、渗氮层和扩散层,其中渗氮层主要物相为ε-Fe2-3N.耐磨性实验表明,QPQ处理可显著改善304不锈钢耐磨性.在565℃渗氮时间150 min为改善耐磨性的最佳时间,处理后试样的耐磨性比原始试样提高10倍左右.     

QPQ处理对材料耐蚀性的影响

对不同材料采用QPQ技术进行处理。通过金相显微镜、显微硬度计、动电位极化曲线等测试手段对QPQ技术处理后膜层的金相组织、显微硬度以及电化学腐蚀性能进行分析。研究结果表明:QPQ技术处理后,材质表面均形成了均匀的渗氮层,显微硬度明显提高;其中35Cr Mo经QPQ技术处理后所得膜层的表面硬度及化合物硬度最高,耐蚀性最佳。     

离子渗氮对304不锈钢组织和性能的影响

为了提高旋振筛机在筛分锂能电池的正、负极材料时的使用寿命和物料的纯洁度,研究了304不锈钢试块在520 ℃下离子渗氮时间对其组织、硬度和耐蚀性能的影响。利用维氏显微硬度计和光学显微镜对渗氮层进行了硬度和深度测试,用球盘式旋转摩擦磨损试验机对渗氮层进行了摩擦磨损性能测试,用电化学工作站进行了耐蚀性能测试,并用X射线衍射仪对试样渗层进行了物相分析。结果表明,相比未经渗氮处理,304不锈钢试块经过渗氮处理后,渗层30 μm深度处的硬度提高了5~6倍,渗层相对耐磨性为未经处理的24.5倍;尽管耐盐蚀性能降低,但其耐碱蚀性能提高。考虑到锂能电池的正极材料偏碱性和负极材料中性特点,旋振筛机上的304不锈钢网架和筛框经过离子渗氮处理后既可以大大提高旋振筛机的使用寿命,还能提高所筛分物料的纯洁度。     

QPQ技术的渗氮工艺对零件抗蚀性的影响

QPQ工艺是一种主要包括盐浴渗氮和盐浴氧化的表面强化技术。通过经QPQ处理的低碳钢片的盐雾试验,探讨了盐浴渗氮温度和时间对经QPQ处理的工件抗蚀性的影响。结果表明,存在一个适当的渗氮温度和渗氮时间范围,在该范围内处理的零件抗蚀性最佳。     

Improvement of corrosion and wear resistances of AISI 420 martensitic stainless steel using plasma nitriding at low temperature

The influence of low temperature plasma nitriding on the wear and corrosion resistance of AISI 420 martensitic stainless steel was investigated. Plasma nitriding experiments were carried out with DC-pulsed plasma in 25% N₂ + 75% H₂ atmosphere at 350 °C, 450 °C and 550 °C for 15 h. The composition, microstructure and hardness of the nitrided samples were examined. The wear resistances of plasma nitrided samples were determined with a ball-on-disc wear tester. The corrosion behaviors of plasma nitrided AISI420 stainless steel were evaluated using anodic polarization tests and salt fog spray tests in the simulated industrial environment.The results show that plasma nitriding produces a relatively thick nitrided layer consisting of a compound layer and an adjacent nitrogen diffusion layer on the AISI 420 stainless steel surface. Plasma nitriding not only increases the surface hardness but also improves the wear resistance of the martensitic stainless steel. Furthermore, the anti-wear property of the steel nitrided at 350 °C is much more excellent than that at 550 °C. In addition, the corrosion resistance of AISI420 martensitic stainless steel is considerably improved by 350 °C low temperature plasma nitriding. The improved corrosion resistance is considered to be related to the combined effect of the solid solution of Cr and the high chemical stable phases of ?-Fe₃N and α_N formed on the martensitic stainless steel surface during 350 °C low temperature plasma nitriding. However, plasma nitriding carried out at 450 °C or 550 °C reduces the corrosion resistance of samples, because of the formation of CrN and leading to the depletion of Cr in the solid solution phase of the nitrided layer.     

盐浴渗氮处理对FeCrMnNiAl0.2Ti0.1高熵合金组织及性能的影响

采用盐浴渗氮的化学热处理方法对FeCrMnNiAl_0.2Ti_0.1高熵合金进行表面强化,主要工艺为预热+盐浴渗氮+氧化,研究渗氮温度对渗层和性能的影响。采用光学显微镜、扫描电镜、X射线衍射仪研究不同渗氮温度下高熵合金的组织结构和物相,利用显微硬度计和W-2000摩擦磨损试验机分别测量硬度和耐磨性。结果表明,经过盐浴渗氮后,高熵合金表面形成含氮化物和氧化物的复合渗层,渗氮层深度最高为27.1 μm,硬度最高可达1080.0 HV0.2。盐浴渗氮可以有效提高高熵合金的耐磨性,改善摩擦学行为,640 ℃渗氮试样的磨损率仅为0.025 mm³/(N·m),与铸态相比降低了约76.7%。     

Microstructure and Properties of SAE 2205 Stainless Steel After Salt Bath Nitrocarburizing at 450 °C

Nitrocarburizing of the type SAE 2205 duplex stainless steel was conducted at 450 °C, using a type of salt bath chemical surface treatment, and the microstructure and properties of the nitrided surface were systematically researched. Experimental results revealed that a modified layer transformed on the surface of samples with the thickness ranging from 3 to 28 μm changed with the treatment time. After 2205 duplex stainless steel was subjected to salt bath nitriding at 450 °C for time less than 8 h, the preexisting ferrite zone in the surface transformed into austenite by active nitrogen diffusion. The main phase of the nitrided layer was the expanded austenite. When the treatment time was extended to 16 h, the preexisting ferrite zone in the expanded austenite was decomposed and transformed partially into ε-nitride precipitate. When the treatment time extended to 40 h, the preexisting ferrite zone in the expanded austenite was transformed into ε-nitride and CrN precipitate. Further, a large amount of nitride precipitated from preexisting austenite zone. The nitrided layer depth thickness changed intensively with the increasing nitriding time. The growth of the nitride layer takes place mainly by nitrogen diffusion according to the expected parabolic rate law. The salt bath nitriding can effectively improve the surface hardness. The maximum values measured from the treated surface are observed to be approximately 1400 HV_0.1 after 8 h, which is about 3.5 times as hard as the untreated material (396 HV_0.1). Low-temperature nitriding can improve the erosion/corrosion resistance. After nitriding for 4 h, the sample has the best corrosion resistance.     

38CrMoAlA、40Cr钢经不同渗氮工艺处理后的性能研究

研究了38CrMoAlA和40Cr钢经气体渗氮、气体氮碳共渗、离子渗氮处理后渗氮层的组织、硬度、摩擦磨损和腐蚀性能。试验结果表明，38CrMoAlA钢渗氮层的硬度及在3．5％NaCl溶液中的耐蚀性能高于40Cr钢，但抗摩擦磨损性能不如40Cr钢。依气体渗氮、气体氮碳共渗到离子渗氮的顺序，渗氮层的抗磨损性能逐次提高，但抗腐蚀能力逐次降低。从钢的化学成分、渗氮层的硬度和韧性出发，对38CrMoAlA和40Cr钢渗氮层的性能差异进行了分析与总结。     

钛催渗盐浴氮碳共渗对H13表面性能的影响

研究了钛催渗对H13钢盐浴氮碳共渗的影响,分别就盐浴处理温度和时间等工艺参数对试样表面性能影响进行了研究。试验结果表明,钛催渗剂的多少对共渗层表面硬度具有显著影响,钛催渗可显著缩短盐浴处理时间,有效提高渗层厚度和硬度,能得到质量良好的渗层。     

304 不锈钢低温离子渗氮及氮碳共渗处理

目的研究304不锈钢离子渗氮层和氮碳共渗层的组织、硬度及耐磨、耐蚀性能,并考察渗层的磨损机理。方法利用离子渗氮及氮碳共渗工艺在304不锈钢表面获得硬化层,利用XRD,OM及共聚焦显微镜、显微硬度仪、电化学测试仪,分析处理前后渗层的组织、相结构及渗层的硬度及耐磨耐蚀性能。结果 304不锈钢氮碳共渗和渗氮层主要为S相层,在相同工艺条件下,氮碳共渗工艺获得的渗层为γN+γC的复合渗层,且厚度大于单一渗氮层。渗氮层和氮碳共渗层硬度约为基体硬度的3.5倍。在干滑动摩擦条件下,氮碳共渗层比渗氮层具有更好的耐磨性能;渗氮层的磨损机理为磨粒磨损的犁沟效应和断裂,氮碳共渗层的磨损机理为磨粒磨损的犁沟和微切削。电化学测试表明,渗氮层和氮碳共渗层的耐蚀性能均优于基体。结论 304不锈钢在420℃进行离子渗氮和氮碳共渗处理后,硬度和耐磨性能可大幅提高,且氮碳共渗处理效果更佳。     

Plasma nitriding of plastic mold steel to increase wear- and corrosion properties

In this study, the wear- and corrosion resistance of the layers formed on the surface of a precipitation hardenable plastic mold steel (NAK55) by plasma nitriding were investigated. Plasma nitriding experiments were carried out at an industrial nitriding facility in an atmosphere of 25% N₂ + 75% H₂ at 475 °C, 500 °C, and 525 °C for 10 h. The microstructures of the nitrided layers were examined, and various phases present were determined by X-ray diffraction. Wear tests were carried out on a block-on-ring wear tester under unlubricated conditions. The corrosion behaviors were evaluated using anodic polarization tests in 3.5% NaCl solution.The findings had shown that plasma nitriding does not cause the core to soften by overaging. Nitriding and aging could be achieved simultaneously in the same treatment cycle. Plasma nitriding of NAK55 mold steel produced a nitrided layer consisted of a compound layer rich in ε-nitride and an adjacent nitrogen diffusion layer on the steel surface. Increasing the nitriding temperature could bring about increase in the thickness of the nitrided layer and the nitride volume fraction. Plasma nitriding improved not only surface hardness but also wear resistance. The anti-wear property of the steel was found to relate to the increase in the thickness of the diffusion layer. Corrosion study revealed that plasma nitriding significantly improved corrosion resistance in terms of corrosion potential and corrosion rate. Improvement in corrosion resistance was found to be directly related to the increase in the nitride volume fraction at the steel surface.     

QPQ盐浴复合处理对35钢组织和性能的影响

对35钢进行QPQ盐浴氮化复合处理,运用X射线衍射（XRD）和金相显微镜（OM）对处理后的样品进行相结构和组织形貌分析,另外还对处理前、后的35钢分别进行了显微硬度测试、极化曲线测试以及滑动磨损性能实验。结果表明：经过QPQ处理后的35钢表面生成了一层铁的氮化物和氧化物,其相应的耐磨性能和耐腐蚀性能都有了很大提高。