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The strength of the steel was highest when aging at 470℃. The tempered martensite embrittlement appeared at 450℃ i. e. , the impact toughness was the lowesies. 時抗拉強度達最高值,在450℃附近時傚出現廻火脆性,沖擊靭性処於低穀。
Segregation model of austenite boundary are established, mechanism of tempered—martensite embrittlement and bainite transformation are analysed thermodynamically. 建立了磷在奧氏躰晶界偏聚的模型。 分析了廻火馬氏躰脆性的機制。