金属学报  1979, Vol. 15 Issue (4): 498-589

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淬火温度对中碳钢的组织和强韧性的影响

楼秉哲;陈希成

陕西机械学院;中国科学院物理研究所

EFFECT OF AUSTENITIZING TEMPERATURE ON THE MICROSTRUCTURE AND FRACTURE TOUGHNESS OF A MEDIUM CARBON CrMnMo STEEL

Lou Bingzhe;Chen Xicheng Shaanxi Mechanical Engineering Institute Institute of Physics; Academia Sinica

楼秉哲;陈希成. 淬火温度对中碳钢的组织和强韧性的影响[J]. 金属学报, 1979, 15(4): 498-589.
, . EFFECT OF AUSTENITIZING TEMPERATURE ON THE MICROSTRUCTURE AND FRACTURE TOUGHNESS OF A MEDIUM CARBON CrMnMo STEEL[J]. Acta Metall Sin, 1979, 15(4): 498-589.

摘要 参考文献 相关文章 Metrics 全文: PDF(3936 KB)   摘要: 本文研究了高温淬火0.5％C-CrMnMo钢高温回大状态的组织和强韧性。在高温回大状态下,这种钢可以通过适当提高淬火温度增加淬火组织中板条马氏体数量的方法,显著改善钢的断裂韧度K_(IC),并获得以塑性断裂为主的断裂特点。但是淬火温度过高,在板条马氏体边界会形成明显数量的残留奥氏体薄膜。这种残留奥氏体在500℃回火时,将促进渗碳体沿马氏体边界的连续分布,大大损害钢的断裂韧度,并使钢在断裂时表现出一定的晶间断裂倾向。延长500℃的回火时间,可以通过碳化物的球化和消除片状马氏体内的孪晶亚结构进一步改善钢的K_(Ic),提高断裂过程中塑性断裂的比例。同时,本文讨论了碳化物尺寸变化对裂纹扩展方式的影响。 试验分析表明,由于淬火温度改变而造成的K_(Ic)变化,可用Hahn-Rosenfield关系很好地表示出来。 Abstract：An investigation of the effect of austenitizing temperature on the microstruc-ture, strength and fracture toughness of a quench-tempered 0.5% C CrMnMo steelhas been carried out. The fracture toughness (K_(IC)) of this steel in fully temperedcondition was improved by adequately increasing the austenitizing temperature inwhich the amount of lath martensite was increased and the rupture was mainlyductile. When the austenitizing temperature went up beyond 950℃, films of retainedaustenite began to appear at the lath boundaries. Such a distribution of retainedaustenite would seem to be liable to continuous precipitation of carbide platesaround the lath boundaries owing to its decomposition on being tempered at 500℃.Such carbide plates would seriously deteriorate the fracture toughness of the steeland enhance its tendency to intergranular fracture. After protracted tempering at500℃, spheroidization of the carbides and disappearance of the twins in acicularmartensite resulted. Both would contribute to the improvement of the fracturetoughness (K_(IC)) of the steel, as well as to an improvement of the ductile behaviouron fracturing. The effect of carbide size on the propagation behaviour of cracksare discussed tentatively. The variation of the plane strain fracture toughness (K_(IC))caused by an increase of austenitizing temperature would seem to agree well withthe Hahn-Rosenfield relation. 收稿日期: 1979-04-18      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 楼秉哲 陈希成 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1979/V15/I4/498 [1] Lai, G. Y., Wood, W. E., Clark, R. A., Zackay, V. F. and Parker, E. R., Met. Trans., 5 (1974) , 1663． [2] Zackay, V. F., Parker, E. R. and Wood, W. E., Microstructure and Design of Alloys, International Conference on the Strength of. Metals and Alloys, 3d, Cambridge, Eng., 1973, Vol. 1, p. 175． [3] Beachem, C. D., Met. Trans., 4 (1973) , 1999． [4] Thomas, G., Iron and Steel Inter., 46． (1973) , 451． [5] Das, S. K. and Thomas, G., ASM Trans. Quart., 62 (1969) , 659． [6] Hahn, G. T. and Rosenfield, A. R., Applications Related Phenomena in Titanium Alloys, Amer. Soc. Test. Mater., Spec. Tech. Publ. №. 432, 1968, p. 5 No related articles found! Viewed Full text Abstract Cited   Shared      Discussed