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稀土对铜铬锆合金性能的影响 总被引:8,自引:4,他引:8
研究了不同稀土含量和时效处理工艺对铜铬锆合金性能的影响。结果表明:随稀土含量的增加,合金的硬度和晶粒尺寸增大,加入适量的稀土,可提高合金的导电率。提高时效温度,可提高合金的导电率,但对合金硬度的影响有个最佳值。 相似文献
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目的提高锆合金微弧氧化后表面氧化膜的致密度。方法先对锆合金进行微弧氧化处理,在表面形成氧化锆陶瓷层,再进行不同工艺下的喷丸处理,以提高锆合金表层氧化膜的致密度。通过表面粗糙度测试,表征不同喷丸工艺下试样表面的塑性变形程度,并通过扫描电子显微镜对氧化膜表面形貌和横截面厚度进行分析,最后计算表面膜层中的孔隙率,以表征微弧氧化后喷丸的致密化效果。结果较高的喷丸强度和较长的喷丸时间均会使得膜层表面发生剧烈的塑性变形,导致表面氧化膜脱落,对锆合金的表面完整性具有不利影响。当使用AGB35玻璃丸在0.2 MPa气压下喷丸10 s时,取得了较好的致密化效果。与微弧氧化后的原始试样相比,气压控制在0.2 MPa,时间控制在10 s的喷丸处理,可以减小膜层中孔洞的尺寸和数量,使氧化膜中的孔隙率从原始的16.45%降低至7.27%,有效提高了膜层的致密度。随着喷丸气压增加至0.3 MPa或喷丸时间延长至30 s,氧化膜发生大面积脱落,部分基体与氧化膜之间产生孔隙,氧化膜中的孔隙率反而增加至20.20%,这对锆合金的表面完整性具有不利影响。结论合理控制微弧氧化后的喷丸工艺参数,可以致密化锆合金表面的氧化膜,使其更具有保护性,而过高的喷丸强度和过长的喷丸时间均不能实现较好的致密化效果。 相似文献
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对锆合金在低倍腐蚀后所产生的皱折现象进行分析,对异常状态是否属于试样本身的缺陷进行讨论,同时探讨皱折现象形成的原因。分析表明:皱折现象是在制样过程中机械摩擦力作用下产生的,不属于试样本身的缺陷。通过实验结果分析,给出低倍判断的正确结论,有效指导实际工作,对从事锆合金高低倍金相检验工作人员提供借鉴和宝贵经验。 相似文献
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针对薄壁不锈钢圆管的密封焊接,设计了整套激光焊接设备,主要由驱动机构、转盘、随行夹具、下料机构、上料检测组件、焊前检测组件以及激光焊接组件等组成。多工位随行夹具可实现自动检测、来料组装、激光焊接等工序同步进行,增加生产效率。经过实际生产检验表明,生产的成品率达100%,每日产量为3 000件,满足焊接质量及效率要求。 相似文献
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薄壁塑件成型工艺参数优化 总被引:2,自引:2,他引:0
利用Moldflow软件对薄壁塑件产生翘曲的原因进行分析,采用正交试验设计方法对塑件成型的注射时间、熔体温度、保压压力、保压时间、冷却时间等工艺参数进行模拟分析,研究各工艺参数对塑件翘曲的影响,从而获得最优工艺参数组合,指导生产。 相似文献
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含锆铝合金的力学性能和强化机理 总被引:7,自引:0,他引:7
研究了高强铝合金的力学性能与Zr含量的关系,计算了合金的各种强化因素值。研究发现:合金的抗拉强度巩和屈服强度如σ0.2均随Zr含量的增加而增大,增幅分别达到11.8%和12.6%;合金延伸率δ在Zr添加量不高时随Zr含量的增加而增大,在Zr含量为0.06%时出现峰值,随后合金延伸率δ逐渐稳定在8%左右。结合合金显微特征,合金强化机理主要包括晶粒细化、颗粒弥散强化及形变强化,在Zr含量为0.16%的合金中相应的强化值分别为21.35和14MPa. 相似文献
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The existing form and grain refining effects of small zirconium addition in pure Mg, Mg-Yb and Mg-Zn binary alloys, and Mg-Zn-Yb ternary alloy (ZK60-Yb) were investigated. The results show that Zr element exists mainly in single and cluster particles of pure α-Zr or Zn-Zr compounds inside grains and at grain boundaries. Only the particles located in the interior of grains can act as the nucleus for α-Mg growth and effectively promote the formation of Fine equiaxed grains. The broken and dispersed Zr-rich particles produced during the hot extrusion process can form nebulous banded structure in which these free particles may act as obstacles to dislocation motion in wrought magnesium alloys. 相似文献
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Effects of precipitation characteristics on the out-of-pile corrosion behavior of niobium-containing zirconium alloys 总被引:1,自引:0,他引:1
The effects of intermediate annealing temperature on the corrosion behavior of Zr−0.4Nb−0.8Sn−0.3Fe−0.2Cr−0.1Mn and Zr−1.5Nb−0.4Sn−0.1Fe
alloys intermediate-annealed at various temperatures were investigated. The relationship between the corrosion behavior and
the precipitation characteristics was discussed. A desirable microstructure containing a fine dispersion of second phase particles
was obtained by intermediate annealing at a low temperature. Intermediate annealing at higher temperatures resulted in undesirable
microstructural features including the precipitation of β-Zr and the coarsening of precipitates. The corrosion resistance
of the alloys was apparently degraded with increasing size of the precipitated intermetallic compounds, especially in Zr−1.5Nb−0.4Sn−0.1Fe
where β-Zr precipitated on higher-temperature annealing. The corrosion behavior of Zr−1.5Nb−0.4Sn−0.1Fe was more sensitive
to intermediate annealing temperature than was that of Zr−0.4Nb−0.8Sn−0.3Fe−0.2Cr−0.1Mn. An examination of particle size distribution
revealed that the corrosion behavior of the alloys was dominantly affected by β-Zr larger than the specific size, which is
responsible for the difference in corrosion resistance between Zr−0.4Nb−0.8Sn−0.3Fe−0.2Cr−0.1Mn and Zr−1.5Nb−0.4Sn−0.1Fe.
It is implied from these results that the optimum corrosion performance of niobium-containing zirconium alloys is achieved
by maintaining a uniform distribution of fine second phase particles. 相似文献
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研究退火工艺(ATs)对Zr-Sn-Nb合金带材显微组织的影响。基于核燃料组件用条带特征,进行冲制实验,并定量表征锆合金带材的成形性能。结果表明,580℃退火(AT I)样品、620℃退火样品(AT II)和原材的小角度晶界占比分别为14.3%、23.2%和12.4%。AT I带材的成形极限裕度为0.43%,而原材和AT II带材的成形裕度分别仅为-0.35%和-2.8%。退火工艺影响带材再结晶织构的演化过程和改变晶粒尺寸。由于织构总量和极密度变化与带材各向异性程度密切相关,小角度晶界影响带材冲制过程中颈缩单元的应变路径与裂纹扩展,而晶粒尺寸影响带材硬化指数。 相似文献