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金属学报  1984, Vol. 20 Issue (6): 405-490    
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Ni9钢中的回转奥氏体与低温韧性
张弗天;王景韫;郭蕴宜
中国科学院金属研究所;中国科学院金属研究所;中国科学院金属研究所
ON THE RELATIONSHIP BETWEEN RETURN AUSTENITE AND TOUGHNESS FOR Ni9 STEEL AT CRYOGENIC TEMPERATURES
ZHANG Futian; WANG Jingyun; GUO Yunyi (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 6 September; 1983; revised manuscript 20 February; 1984)
引用本文:

张弗天;王景韫;郭蕴宜. Ni9钢中的回转奥氏体与低温韧性[J]. 金属学报, 1984, 20(6): 405-490.
, , . ON THE RELATIONSHIP BETWEEN RETURN AUSTENITE AND TOUGHNESS FOR Ni9 STEEL AT CRYOGENIC TEMPERATURES[J]. Acta Metall Sin, 1984, 20(6): 405-490.

全文: PDF(2345 KB)  
摘要: 本文研究了经普通热处理与α+γ相区热处理后,Ni9钢组织与-196℃冲击韧性的关系。回转奥氏体的存在提高了低温韧性。经α+γ相区热处理后,回转奥氏体明显增多,且可在马氏体板条间均匀析出。其分布的均匀程度、弥散程度都比普通热处理者为优。回转奥氏体的形态大致有两类:在马氏体板条间析出的为薄片状;在其它界面上析出的为不规则块状。断口观察表明奥氏体确能提高冲击韧性。
Abstract:The toughness of commercial 9 wt-% Ni steel after an intercritical heat treatment (IHT) has been compared with that of the conventionally heat treated (CHT)steel. The toughness of 9 wt-% Ni steel at —196℃ is virtually improved by IHT, and the final value is independent on the prior austenite grain size. It appears that of the benefit of IHT comes mostly from the return austenite; besides it also increases the amount of return austenite which is stable at —196℃ and distributed uniformly over all kinds of boundaries, especially lath martensite boundary. In this case, two types of austenite have been found: the austenite film on boundaries of martensite lath and the irregular blocks particles on prior austenite boundaries, sub-boundaries and so on.
收稿日期: 1984-06-18     
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