共查询到20条相似文献,搜索用时 15 毫秒
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CD3MWCuN高合金超级双相不锈钢具有优良的机械性能和耐蚀综合性能,可广泛适用于海洋和石油化工等行业,特别是在氯化物工况中.通过焊接工艺评定试验,检测、分析了CD3MWCuN补焊接头的性能和组织,确定了合适的焊接工艺方案,为实际生产提供操作规程. 相似文献
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双相不锈钢以其优良的耐腐蚀性能和抗拉强度,在船舶制造、海洋平台、造纸设备、石化设备和桥梁建造等行业得到越来越多的应用.介绍了双向不锈钢气保焊的操作工艺和焊接参数的选择,为这些行业的双相不锈钢焊接提供一些参考. 相似文献
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采用钨极氩弧焊制备了双相钢焊接接头,基于热力学方法计算了母材和焊缝的平衡相变过程,采用OM,SEM,EDS,TEM等方法表征了接头不同区域的微观组织.结果表明,焊缝中添加镍显著促进γ形成并抑制Cr2N析出.焊缝和热影响区γ1主要包含晶粒边界奥氏体、魏氏奥氏体和晶粒内奥氏体,不同类型的奥氏体呈现显著的成分差异.焊缝和热影响区析出两种类型的γ2:晶粒内γ2和晶粒间γ2.γ2易于在δ内和δ/γ1边界处富Ni和N元素而贫Cr和Mo元素的区域析出.Cr2N主要分布于热影响区的δ内、δ/γ2边界以及δ/δ边界处. 相似文献
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采用X射线衍射技术对2205双相不锈钢焊接界面残余应力进行测试,同时利用光学显微镜及电子背散射衍射技术(EBSD)对接头旋合区(RZ)、热机影响区(TMAZ)及热影响区(HAZ)微观组织进行分析。结果表明:接头轴向、径向残余应力均表现为压应力状态,呈单边V形分布,其中轴向残余应力峰值(-287 MPa)位于热机影响区(TMAZ)边缘,该区域α相和γ相在焊接过程中,在剪切及摩擦作用下,发生剧烈扭曲;而焊缝中心旋合区具有明显的动态再结晶特征,呈细小等轴晶状(3~4 μm),残余应力仅为在-15~-54 MPa。 相似文献
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Eun-Joon Chun Jung-Hoon Lee Namhyun Kang 《Science & Technology of Welding & Joining》2013,18(3):263-275
ABSTRACTMetallurgical characteristics of single-mode laser dissimilar welds between super duplex (UNS S32750) and austenitic (type 316L) stainless steels is the existence of an unmixed zone that originates from each base metal. It was confirmed that the unmixed zone that flowed out from the 316L had the microstructural morphology of primary austenite with secondary δ-ferrite solidification mode, while the morphology of a δ-ferrite single phase solidification mode was observed within the unmixed zone that flowed out from the S32750. Furthermore, it could be speculated that each unmixed zone that flowed out from 316L and S32750 coexisted independently in terms of crystallographic aspect (orientation distribution function and predominant orientation relationship) analysed by electron backscatter diffraction. 相似文献
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Y. Isobe 《Welding International》2013,27(2):105-109
In this work, the pitting corrosion resistance of welding duplex stainless steel 2205 was studied. Joints were made using the GMAW process with different fillers: duplex ER 2209 and two austenitic fillers (ER 316LSi and ER 308LSi). The microstructure obtained with the duplex ER 2209 filler is similar to the duplex 2205 base material, but the joints produced with the austenitic fillers cause a decrease of the α/γ phase ratio. In order to evaluate the influence of the filler on the weld, the pitting corrosion resistance was determined by means of an electrochemical critical pitting temperature test, and the mechanical properties by the hardness test. The phase imbalance produced for the different fillers causes variation of the pitting corrosion resistance and the mechanical properties. The variation in the mechanical properties of the material was also studied by means of hardness tests. 相似文献
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采用不同搅拌头转速,研究了搅拌头转速对4 mm厚2205双相不锈钢板材搅拌摩擦焊接头组织及性能的影响. 结果表明,当焊接速度为50 mm/min时,搅拌头转速在600 ~ 800 r/min的范围内,均可获得表面成形良好且内部无缺陷的接头.接头搅拌区在动态再结晶的作用下组织得到细化,硬度值较高,热影响区在焊接热作用下组织粗化,硬度值较低.整个接头的铁素体含量在50% ~ 60%范围内,且随着转速的升高搅拌区的铁素体含量有所增加. 当转速为600 r/min时,接头的抗拉强度达到最大824 MPa,为母材的97.3%,断裂位置为接头的热影响区. 相似文献
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采用2507超级双相不锈钢(2507SDSS)、X80管线钢作为基材,使用熔化极气体保护焊(MIG)技术,制备了2507 SDSS/X80异种金属焊接接头。对异种金属焊接接头不同区域的微观组织结构进行表征,分析焊接接头的组织和性能。结果表明,在熔合界面与II型界面之间存在明显的Fe、Cr、Ni、Mo、Mn浓度梯度,稀释区具有最高的硬度。X80钢与焊缝金属构成电偶腐蚀,将加速低碳钢的腐蚀,是工业应用中的薄弱环节。 相似文献
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采用试验室制造的不同成分的焊丝,用Ar+H2混合气体保护的TIG焊方法,通过纵向焊道拉伸拘束裂纹(LB-TRC)试验和焊缝金属恒应变速率拉伸(WM-SERT)试验,定量研究了双相不锈钢焊缝金属中铁素体含量对氢致裂纹敏感性的影响。结果表明,当双相不锈钢焊缝金属中δ铁素体含量小于50%时。焊缝金属对氢致裂纹不敏感;当δ铁素体含量大于50%时,随铁素体含量的增加,氢裂敏感性显著增加。 相似文献
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选用2507超级双相不锈钢作为研究对象,研究钨极氩弧焊多层多道焊接接头的组织和腐蚀性能.采用两种不同保护气进行钨极氩弧焊,主要讨论焊接道次和氮气添加对组织和腐蚀性能的影响.结果表明,焊缝中心均有较高的奥氏体含量,其腐蚀速率是焊根部位的0.68倍;盖面和焊根奥氏体含量相近,但盖面由于其弥散且尺寸相对较大的晶内奥氏体表现出更好的耐腐蚀性,焊根是焊缝金属的薄弱区域.混合区由于热影响区的存在腐蚀速率最快.保护气中氮气的添加促进了奥氏体的生成,降低了腐蚀电流密度一个数量级,提高了整体的腐蚀性能. 相似文献
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Different electrochemical techniques were used to study the corrosion behavior of UNS S32205 duplex stainless steel (DSS) welded autogenously using a single-pass by electron beam welding process, supplemented by microstructural characterization. Furthermore, a comparative study was also performed between multipass gas tungsten arc (GTA)-welded and EB-welded DSS for their microstructure and corrosion behavior. The differences in weld thermal cycle and chemical composition influenced the fusion zone microstructure of both the welds and eventually their corrosion properties. The general corrosion resistance of the EB weld was lower than the base metal and higher than the GTA weld despite its weld zone being characterized by a relatively unbalanced phase ratio (α/γ) in comparison to the GTA weld. However, the EB weld showed relatively higher susceptibility to pitting corrosion than the base metal and GTA weld due to its poor repassivation characteristics and poor resistance to pit growth. 相似文献
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Multi-layer narrow-gap welding of thick S32101 duplex stainless steel was conducted using laser welding with beam wobble process. The phase transition, grain size, phase proportion and crystal texture of welded joint were also studied and compared with gas metal arc welding process. The microhardness and tensile strength were measured and fracture surface was analyzed to evaluate the mechanical properties of welded joints. The results showed that beam wobble technology improved the misalignment ... 相似文献