共查询到20条相似文献,搜索用时 78 毫秒
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<正> Cr17Ni2钢是白点敏感性强且易炸裂的马氏体耐腐蚀不锈钢,特别是大尺寸的锻件,如果锻造和锻后热处理工艺选择不当都极易炸裂。Cr17Ni2钢的化学成分(%)是:C0.11~0.17,Cr16.0~18.1,Ni1.5~2.5,P≤0.03,S≤0.025。 相似文献
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<正> 在高功率发电机转子锻件的制造中,存在着获得粗大奥氏体晶粒的客观条件.由于转子钢对于组织遗传性的倾向高,这些粗大的奥氏体晶粒的形状和大小在热处理过程中被保留了下来. 相似文献
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试验对铬钼耐热钢焊接接头进行三种不同的焊后热处理(690 ℃×1 h,690 ℃×8 h,730 ℃×2 h),采用扫描电镜、显微硬度计等设备观察焊接接头的显微组织类型、冲击断口形貌,探究其室温冲击韧性出现差异的原因。结果表明,耐热钢焊接接头焊态的金相组织由M-A组元和尺寸较小的铁素体组成,而其焊后热处理态的显微组织由块状铁素体以及碳化物组成;碳化物的析出导致铁素体亚晶粒尺寸减小、屈服强度和硬度降低,从而推迟解理断裂的发生,这是焊接接头730 ℃×2 h热处理后冲击韧性较高的主要原因。 相似文献
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原奥氏体晶粒度对45V非调质钢连续冷却转变的影响 总被引:2,自引:0,他引:2
采用FormastorF热膨胀分析仪及金相显微镜研究了原奥氏体晶粒度对45V非调质钢相变点及显微组织的影响。结果表明,在相同的冷速下,相变前奥氏体晶粒尺寸越大,先共析铁素体量越少,先共析铁素体和珠光体转变温度越低 相似文献
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Influence of Solution Treatment on Impact Toughness and Microstructure of Cobalt-free Maraging Steel
Yu Jianmin Li Baocheng Zhang Baohong Yang Weiyu North University of China Taiyuan China Engineering Research Center of Magnesium-base Material Processing Technology Ministry of Education 《稀有金属材料与工程》2011,(Z3):114-117
The influence of different solution temperature on microstructure and impact toughness of cobalt-free maraging steel 00Ni14Cr3Mo3Ti was investigated by SEM and X-Ray diffractometer.The experimental results showed that with the solution temperature variation, the martensite morphology has not changed, is still lath martensite.Undissolved Laves phase hindered the dislocation movement after 750 ℃ solution heat treatment, which result in a very low impact absorbed energy, the impact fracture has no obvious plastic deformation, with bad toughness.With the solution temperature increased, the undissolved phase gradually dissolved, the impact absorbed energy increased gradually.All the Laves phase dissolved when reach to 900 ℃, the impact absorbed energy reaches the maximum, is 61 J.Fracture morphology change from brittle fracture into toughness transgranular fracture with deep dimple. When solution temperature is above 900 ℃, with the solution temperature further increase, austenite grain size increases significantly.Average grain diameter of austenite is about 70 μm after 1050 ℃ solution treatment, the density of precipitates on the grain boundary of maraging steel is increase substantially, deformation compatibility deteriorate, which result in the impact absorbed energy decreased significantly.Fracture type becomes transgranular and quasi-cleavage mixed fracture with the characteristics of the river patterns from ductile transgranular fracture. 相似文献
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通过对42CrMo4风机主轴结构尺寸、性能要求、材质特点等方面进行分析,对原有锻后热处理工艺进行优化,制定出既能达到锻后热处理效果又经济节能的工艺参数. 相似文献
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文章通过金相﹑X射线衍射(XRD)﹑扫描电镜(SEM/EDS) 及透射电镜(TEM)和力学性能分析方法研究不同热处理工艺对含多元合金元素铜合金硬度和冲击韧性的影响。结果表明:热处理能改变该合金的硬度,而对其冲击韧性影响不大,该合金经500 ℃保温2 h空冷后可获得较高硬度。 相似文献