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节约型双相不锈钢是一种高性能、低成本的结构材料,拥有广阔的应用前景,有望广泛应用于核电、石化、造船、造纸和海水淡化等领域,但是其热加工制备困难,阻碍了大规模工业化生产。简要介绍了国内外双相不锈钢的研究现状,综述了双相不锈钢的组织性能演变、热变形规律及脆性相析出行为等。从组织演变规律入手,指出改善节约型双相不锈钢热塑性的重要性及可行性。 相似文献
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《不锈(市场与信息)》2007,(17):23-23
据位于美国俄勒冈州奥尔巴尼的ATI Wah Chang公司报道,一种经济、高强度、节约型双相不锈钢AL2003已经纳入美国机械工程学会标准-ASME Code Case 2503,用于压力容器结构,该合金以特征为具有高强度,有良好的焊接性、成型性和韧性。AL2003的化学成分为20%Cr,3.5%Ni,1.7%Mo,0.17%N,其余为铁。合金含量较低使其具有更低的成本,可替代奥氏体不锈钢316L和双相不锈钢2205。[第一段] 相似文献
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从成分控制、热轧和热处理等角度出发,综合研究双相不锈钢S32101的生产工艺并进行优化调整,分析生产试验数据。研究分析表明:在1050~1150℃固溶处理时,组织中铁索体组织与奥氏体组织的比例接近1:1,钢的综合力学性能最佳。 相似文献
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含氮双相不锈钢及其冶金工艺 总被引:4,自引:0,他引:4
铁素体-奥氏体双相不锈钢比奥氏体不锈钢有较高的机械性能、优良的耐应力腐蚀和点腐蚀性能以及较低的价格(Ni含量低),特别是通过降低钢中的碳含量和增加氮含量而改善了钢的可焊性。双相钢中含较高的氮含量有两个有利的因素:抑制δ-铁素体的形成和提高抗点蚀当量。介绍了4种不同类型的含氮双相不锈钢和常用双相不锈钢的牌号和化学成分、双相不锈钢5种冶金工艺、太钢双相不锈钢的生产、高氮双相不锈钢的形变热处理以及双相不锈钢的研究和发展趋势。 相似文献
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在变形温度为1000和1100℃,应变速率为01s-1的条件下,利用MMS-200热模拟试验机,对S32750超级双相不锈钢进行了高温压缩试验。利用电子背散射衍射(EBSD)分析了其晶体取向和微观组织。研究结果表明,铁素体在两种试验条件下均可形成<001>和<111>∥压缩轴织构,在变形温度为1100℃时,<001>织构要强一些;奥氏体在两种变形温度下均形成了<001>织构,强度很弱。在变形温度为1100℃条件下,奥氏体中存在的以Σ3为主的CSL特殊晶界数量更多。两种试验条件下,S32750超级双相不锈钢中铁素体和奥氏体均发生了动态再结晶,降低变形温度有利于细化晶粒。在铁素体向奥氏体转变过程中,奥氏体可以在铁素体晶界处生成,也可以在铁素体晶粒内部形成。 相似文献
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S32205双相不锈钢中σ相的析出及其对力学性能的影响 总被引:1,自引:1,他引:0
对S32205双相不锈钢在850℃进行时效处理,采用光镜、扫描电镜、能谱仪、硬度和拉伸测试等手段研究了σ相的析出规律及其对力学性能的影响。结果表明:时效15 min后σ相开始沿γ/α或α/α晶界析出,并向铁素体一侧长大,其析出反应为铁素体发生转变形成σ相和γ2相;时效时间延长,σ相的析出量增加,时效240 min后σ相的含量达到18%,并导致双相不锈钢的硬度明显增加、强度略有提高,而塑性显著下降;拉伸断口的断裂类型由典型的韧性断裂向以准解理断裂为特征的脆性断裂转变。 相似文献
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Phase Transformation and Its Effects on Mechanical Properties and Pitting Corrosion Resistance of 2205 Duplex Stainless Steel 总被引:2,自引:0,他引:2
The effects of phase transformation on mechanical properties and pitting corrosion of 2205 duplex stainless steel were investigated. The amount of σ phase in the test specimen varied up to a maximum of 6% by thermal treatment at 850 ℃ for up to 60 min. The results showed that σ phase markedly increased the hardness and decreased the impact toughness of the test steel. But the increasing tendency of the ultimate tensile strength and the yield strength was not obvious, while the total elongation abruptly decreased with the aging time from 5 to 60 min. SEM impact microfractograph analysis revealed that the types of impact fracture changed from ductile mode to transcrystalline mode when the specimens were aged for 5-60 min. Furthermore, the extent of pitting potential reducing was found to be strongly temperature dependent, more pronounced at the higher temperature. During the incubation period of σ phase nucleation, the pitting corrosion test temperature and the aging time had collaborative effects on evidently displacing the pitting potential towards less noble values. After 15 min, the higher temperature contributed more to decreasing the pitting potential than the aging time. 相似文献
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Xinjian Yuan Myung Bok Kim Young Ho Cho Chung Yun Kang 《Metallurgical and Materials Transactions A》2012,43(6):1989-2001
The changes in tensile strength and pitting corrosion resistance of transient liquid-phase (TLP)-bonded joints for a duplex
stainless steel with MBF-80, MBF-30, and MBF-35 as functions of holding time and filler were interpreted with respect to the
bond microstructure. Using MBF-80 after 300 seconds, the fracture strength of the joint reached the maximum value. The failure
was dependent on the interplay between the reduction in residual liquid and the increase in interface precipitates. After
3600 seconds, the joint strength had the minimum value. At the same conditions, the tensile strength for MBF-80 was low compared
with MBF-35 and MBF-30. In contrast with the tensile strength, the joint produced with MBF-80 for 3600 seconds exhibited the
best corrosion resistance. Among the fillers used, the corrosion resistance of the joint using MBF-80 close to that of the
substrate could be related intimately to the existence of Cr in this filler. 相似文献