金属学报  1984, Vol. 20 Issue (2): 92-212

论文 本期目录 | 过刊浏览 |

稀土元素对一种Cr-Ni奥氏体钢高温蠕变断裂行为的影响

邱巨峰

冶金工业部包头冶金研究所

INFLUENCE OF RE ADDITION ON CREEP-RUPTURE BEHAVIOUR OF A CrNi AUSTENITIC STEEL

by QIU Jufeng (Baotou Institute of Metallurgy; Ministry of Metallurgical Industry) (Manuscript received 15 November; 1982: revised manuscript 26 August; 1983)

邱巨峰. 稀土元素对一种Cr-Ni奥氏体钢高温蠕变断裂行为的影响[J]. 金属学报, 1984, 20(2): 92-212.
. INFLUENCE OF RE ADDITION ON CREEP-RUPTURE BEHAVIOUR OF A CrNi AUSTENITIC STEEL[J]. Acta Metall Sin, 1984, 20(2): 92-212.

摘要 参考文献 相关文章 Metrics 全文: PDF(2678 KB)   摘要: 研究了添加0.15％混合稀土对Cr18Ni18Si2奥氏体不锈钢高温蠕变断裂强度、塑性及断裂机制的影响。蠕变试验结果表明:含有稀土的Cr18Ni18Si2钢在650—750℃不同应力下的蠕变断裂时间比未加稀土的钢延长约1—4倍,700℃1000h的蠕变断裂应力增加约2kgf/mm~2,断裂塑性增加0.2—2倍,蠕变裂纹及断口的金相和扫描电镜观测结果表明:稀土有强化Cr18Ni18Si2钢晶界、改变断口形貌、阻碍晶界裂纹形成和扩展的作用。 Abstract：An investigation was made of the effects of 0.15％ RE mischmetal addition on the creep-rupture strength and ductility of Cr18Ni18Si2 austenitic stainless steel. The examinations of creep damage and fracture morphology by means of optical and scanning electron microscopy were also carried out to clarify a general aspect for the effects of RE addition on creep-rupture mechanism. The results show that the creep-rupture lives of containing 0.064％RE Cr18Ni18Si2 steel at 650 to 750℃ under 5—10 kgf/mm~2 are greater than those of the steel without RE by factors of about 1 to 4. The creep-rupture strength at 700℃ for 1000 h increases 2 kgf/mm~2 over. The creep-rupture ductility enhances by 0.2 to 2. The fractures of creep-ruptured specimens transit from typical ductile intergranular to mixed mode consisting of major ductile intergranular fracture and minor transgranular tearing. The typical wedge-type cracks form at the triple grain boundary junctions. The average density and length of wedge-type cracks in specimens with RE addition are smaller than that without RE. It is apparent that the creep-rupture process of Cr18Ni18Si2 steel is controlled by grain boundary sliding-stress concentration mechanism. The observations on fracture and creep damage may suggest that the RE addition can strengthen the grain boundary, inhibit their sliding, hence decrease the level of stress concentration at the grain corners. On the other hand, because the deformation resistance within the grains is decreased by RE addition, therefore, the stress concentration may be relaxed by the adjustment due to deformation of adjacent grains. Consequently, it is not easy for cracks to nucleate and propagate in steel Cr18Ni18Si2 with RE addition, resulting in the improvement in creep-rupture properties. 收稿日期: 1984-02-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 邱巨峰 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1984/V20/I2/92 1 李有柯;朱自勇;师昌绪,钢铁,(1965) ,№.11,17． 2 #12 3 #12 4 #12 5 邱巨峰;程万荣;游俊富,金属学报,17(1981) ,94． 6 Bates, J. F.; Loginow, A. W., U. S. Pat., 3523 788, August 11, 1970． or Alloy Digest, ss-253, April, 1971． 7 Perry, A.J., J. Mater. Sci., 9(1974) , 1016． 8 Briant, C. L.; Banerji, S. K., Inter. Met. Rew., 23(1978) , 164． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed