材料期刊网

本文系统地研究了在石氏体组织中所发生的回火脆性。下石氏体在回火过程中脆化的趋势略小于回火马氏体,上石氏体的脆化趋势略大于珠光体,而回火马氏体的回火过程的脆化趋势远大于珠光体。上石氏体的回火脆性发生温度区域是460—580℃,回火马氏体是430—630℃,两者的最大回火脆性温度都是530℃。

A study of the occurrence of temper-brittleness in bainitic structure has been made. It wasfound that the tendency of temper-embrittlement in the lower bainite was slightly less than thatin the tempered martensite whik the temper-embrittlement in the upper bainite was slightly greaterthan that in pearlitic structure, and the tendency of temper embrittlement of the temperedmartensite was much greater than that of the pearlite. The temperature range of temper-brittleness was 460—580℃ for upper bainite, 430—620℃ for tempered martensite, and the tem-perature of maximum temper-embrittlement appeared to be about 530℃ for both. It was sug-gested that the mechanism of temper-brittleness is the same for both structures.