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。
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.
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