金属学报  1983, Vol. 19 Issue (1): 59-145

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蠕变断裂韧性对裂纹开裂和扩展的影响

周顺深

上海发电设备成套研究所

EFFECT OF CREEP FRACTURE TOUGHNESS ON CRACK INITIATION AND GROWTH

ZHOU Shunshen (Shanghai Power Plant Equipment Research Institute)

周顺深. 蠕变断裂韧性对裂纹开裂和扩展的影响[J]. 金属学报, 1983, 19(1): 59-145.
. EFFECT OF CREEP FRACTURE TOUGHNESS ON CRACK INITIATION AND GROWTH[J]. Acta Metall Sin, 1983, 19(1): 59-145.

摘要 参考文献 相关文章 Metrics 全文: PDF(2590 KB)   摘要: 本文研究了蠕变断裂韧性对二种低合金耐热钢蠕变裂纹开裂和扩展的影响。试验表明:随着蠕变断裂韧性提高,抗蠕变裂纹开裂和扩展能力增加。材料呈韧性或脆性状态时,蠕变裂纹萌生和扩展过程不同。韧性状态时,裂纹为穿晶和晶界二种混合形式:穿晶裂纹可在晶内碳化物处发生,或在晶界上形核后向晶内扩展,晶界裂纹仍是由晶界上空洞形成和相互连接而成,裂纹可沿晶界和晶内扩展,但不连续。脆性状态时,裂纹沿晶界发生,它是由晶界形成空洞和相互连接而成,扩展仅沿晶界发生。 Abstract：An investigation was made of the effect of creep fracture toughness on the crack initiation and growth of two low-alloy heat resistant steels 25Cr2Mo1V and 12Cr1MoV. It was found that the resistance to creep crack initiation and growth of steel 25Cr2Mo1V, with a higher creep rupture strength, is much lower than that of 12Cr1MoV. This resistance is increased with the increase of the creep fracture toughness. For steel 25Cr2Mo1V, the creep rupture strength decreases slightly, and the creep fracture toughness and the resistance to crack initiation and growth increase along with the raise of the tempering temperature. As the steels are in tough or brittle state, the initiation and growth of creep crack are varied. In the tough state, cracking is both transgranular and intergranular around the notch tip. The transgranular crack may be either occurred in carbide inside the grains or nucleated at grain boundary and then propagated into grain. However, the intergranular crack may be formed by nucleation, growth and interlinkage of voids. Cracks may be propagated along grain boundaries and penetrated through the grains yet they are discontinuous. In the brittle state, cracks occur along grain boundaries only. They originate from the interlinkage of voids and cause eventually to brittle fracture. 收稿日期: 1983-01-18      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 周顺深 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1983/V19/I1/59 1 Neate, G. J., Siverns, M. J., The Application of Fracture Mechanics to Creep Crack Growth, Int. Conf. on Creep and Fatigue in Elevated Temperature Applications, Philadelphia 1973 and Sheffield U K 1974, C234/73． 2 Pilkington, R.; Miller, D. A.; Worswick, O., Metall. Trans., 12A(1981) , 173． 3 周顺深,理化检验(物理分册),1978,№6,15． 4 Haign, J. R., Mater. Sci. Eng., 20(1975) , 213． 5 周顺深;陈冲,动力工程,(1981) ,№5,24． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed