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奥氏体不锈钢焊缝接头一般情况下都采用射线探伤方式检测焊缝内部质量。射线探伤无法对焊缝中所发现的缺陷准确定位。故考虑利用现有的常规超声波检测方法来弥补射线探伤的不足。 相似文献
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由于奥氏体不锈钢焊缝接头属于粗晶组织,一般情况下都采用射线探伤的方式对焊缝内部质量进行检测。然而射线探伤无法对焊缝中所发现的缺陷进行准确定位,本文利用现有的常规超声波检测方法来弥补射线探伤的不足。 相似文献
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文中通过5A05铝合金薄板搅拌摩擦焊对接试验,进行了力学性能分析和X射线探伤,研究接头错边量和间隙量对搅拌摩擦焊对接接头缺陷和力学性能的影响。试验结果表明当错边量大于0.5 mm或间隙量大于0.8 mm时焊缝力学性能下降并伴随下压量增大和缺陷的产生,接头缺陷与拉伸试验断裂部位大多在焊缝前进侧。错边量和间隙量对铝合金薄板搅拌摩擦焊对接接头力学性能及内部质量有重要影响,为保证焊接生产质量,搅拌摩擦焊焊接过程中应该严格控制接头错边量和间隙量。 相似文献
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采用光纤激光对304奥氏体不锈钢进行焊接,获得成型良好的激光焊接接头,利用光学显微镜、超景深、显微硬度计等分析检测手段,对304不锈钢焊接接头的微观组织特点、力学性能及断口特征进行了研究并进行相应的分析.结果表明,在激光焊接过程中,由于焊缝冷却速度较快,焊缝组织主要以垂直于熔合线的柱状晶的形态存在,焊缝中心组织以等轴晶为主,热影响区不明显;接头硬度分布不均匀,焊缝处硬度最高,热影响区未发生明显软化;焊接接头抗拉强度为711.5MPa,接头拉伸后断于焊缝,拉伸性能达母材拉伸性能的97.5%,可应用于各种工程. 相似文献
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分别采用钨极氩弧焊(TIG)、选用ER309L焊丝和焊条电弧焊(SMAW)、选用A302焊条两种不同工艺焊接405/Q245R不锈钢复合板的覆层和过渡层,并采用焊条电弧焊方法、选用E4315焊条焊接其基层。对复合板接头进行力学性能测试,结果表明,接头的抗拉强度接近于母材本身强度,拉伸试样断裂均发生于母材部位;对接头金相组织的观察显示,两种接头的过渡层焊缝组织均为奥氏体加少量铁素体,在过渡层焊缝/基层母材侧界面未发生明显的碳迁移现象;进一步对过渡层焊缝进行XRD测定,未发现接头焊缝中有害相的生成,说明获得接头的性能良好,焊接工艺可行,能够满足工程实际需要。 相似文献
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通过对热轧410S不锈钢板材手工钨极氩弧焊(TIG)焊接接头的组织观察、无损检测、力学性能和耐晶间腐蚀性能试验,以及铁素体含量和显微硬度的测定,研究了热轧410S不锈钢板材TIG焊接接头的组织与性能。结果表明:采用TIG方法焊接410S不锈钢接头的抗拉强度不低于母材的,而且塑性良好;焊接接头的宏观形貌呈铸造粗大组织,并具有明显的外延生长特性;焊缝组织主要为柱状晶奥氏体+沿柱状晶分布的δ铁素体,δ铁素体体积分数为15%~20%;热影响区的马氏体在焊接热的作用下发生了M→γ→M相变,原处于晶界条带中细小的颗粒状马氏体被黑色的团块状马氏体所替代;该焊接接头的晶间腐蚀倾向按热影响区、母材、焊缝顺序依次降低。 相似文献
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G. Madhusudan Reddy K. Srinivasa Rao 《The International Journal of Advanced Manufacturing Technology》2009,45(9-10):875-888
Microstructure and mechanical properties of similar and dissimilar welds of austenitic stainless steel (AISI 304), ferritic stainless steel (AISI 430), and duplex stainless steel (AISI 2205) have been studied. Welding processes electron beam welding and friction welding were used. Optical, scanning electron microscopy, and electron probe microscopy were carried out to study the microstructural changes. Residual stress, hardness, tensile strength, and impact toughness testing were conducted to study mechanical behavior. Dissimilar metal electron beam welds of austenitic–ferritic, ferritic–duplex, and austenitic–duplex stainless steel welds contained coarse grains, which are predominantly equiaxed on austenitic, duplex stainless steel side, and they are columnar on the ferritic stainless steel side. Diffusion of elements was significant in electron beam welding and insignificant in friction welds. Austenitic–ferritic stainless steel exhibited tensile residual stress on the ferritic stainless steel side adjacent to the interface, compressive stresses on the austenitic stainless steel side that matches with the delta ferrite microstructure observed in this region. High compressive stresses were noted on duplex stainless steel side interface compared to austenitic stainless side interface. The highest tensile strength was observed in duplex–austenitic stainless steel joints. The impact strength and notch tensile strength of electron beam weldments are higher than the friction weldments. All electron beam and friction welds showed toughness lower than parent metals. 相似文献
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Most research to date concerning the cryogenic toughness of austenitic stainless steels has concentrated on the base metal and weld metal in weldments. The most severe problem faced on the conventional austenitic stainless steel is the thermal aging degradation such as sensitization and carbide induced embrittlement. In this paper, we investigate the cryogenic toughness degradation which can be occurred for austenitic stainless in welding. The test materials are austenitic stainless JN1, JJ1 and JK2 steels, which are materials recently developed for use in nuclear fusion apparatus at cryogenic temperature. The small punch (SP) test was conducted to detect similar isothermally aging condition with material degradation occurred in service welding. The single-specimen unloading compliance method was used to determine toughness degradation caused by thermal aging for austenitic stainless steels. In addition, we have investigated size effect on fracture toughness by using 20% side-grooved 0.5TCT specimens. 相似文献
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静拉伸试验结果表明:FeCrNi奥氏体不锈钢塑性良好,无明显屈服平台,但应力—应变关系与Ramberg-Osgood式吻合度不高,宜采用Ainsworth法基于材料应力应变构建失效评定曲线。按SINTAP标准中Option3技术路线,应用ExpAssoc指数型函数拟合真应力—应变数据,计算获得相应失效评定曲线,与两类国际通用失效评定曲线比较分析结果可知:三类失效评定曲线有区段重叠,若塑性截止线选取小于1.39,欧洲SINTAP给出通用失效评定曲线具有包络性和保守性,可用于工程评定,偏于安全。 相似文献
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改善不锈钢切削加工性的试验研究 总被引:1,自引:0,他引:1
这里推导出阶梯法耐用度试验的数据处理公式,并利用此方法对普通奥氏体不锈钢和加硒不锈钢材料进行了切削加工对比试验,证明了加硒不锈钢的切削加工性比普通奥氏体不锈钢提高了1.5倍。 相似文献