The effect of molybdenum on high-temperature properties of 9 pct Cr steels
The effect of molybdenum on high-temperature properties of 9 pct Cr steels
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钼对9%Cr钢高温性能的影响
DOI：
10.1007/bf02670701
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
W. C. Hagel
中科院分区：
文献类型：
--
作者：
P. Grobner;W. C. Hagel
对含钼1%、2%和3%的耐热9Cr钢的力学性能、焊接性和持久性能进行了测试。合金的高温强度和持久强度随钼含量的增加而增加。9Cr1Mo钢为马氏体型碳化物析出强化钢，9Cr2Mo钢和9Cr3Mo钢通过Laves相的析出和固溶强化获得了额外的益处。后者对延性和抗冲击性的影响很小。9Cr2Mo钢和9Cr3Mo钢具有双重组织的特点，有助于焊接性。焊接裂纹试验表明，后两种钢不需要预热，但已知马氏体钢9Cr-1Mo在不预热的情况下容易产生焊接裂纹。两种双相组织钢都具有良好的抗应力消除开裂性能。由于双相组织在轧制方向上的取向，其力学性能的各向异性比完全马氏体态的9Cr1Mo钢要小。
Heat-resistant 9 Cr steels with 1, 2, and 3 pct Mo were tested for mechanical properties, weldability, and creep-rupture properties. The elevated-temperature and rupture strengths increase with increasing molybdenum content. While the 9 Cr-1 Mo steel is martensitic and is precipitation strengthened with carbides, the 9 Cr-2 Mo and 9 Cr-3 Mo steels receive added benefits from precipitation of Laves phase and solid-solution strengthening. The latter cause little decrease in ductility and impact resistance. The 9 Cr-2 Mo and 9 Cr-3 Mo steels are characterized by a duplex microstructure which aids weldability. Weld cracking tests show no need for preheating the latter steels, although the martensitic 9 Cr-1 Mo steel is known to be susceptible to weld cracking if not preheated. Both duplex-structure steels have good resistance to stress-relief cracking. Anisotropy of mechanical properties, due to the orientation of the duplex structure in the rolling direction, is less than that observed in the fully martensitic 9 Cr-1 Mo steel.