| 15CrMoVA钢粒状贝氏体回火脆性的研究 |
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| 引用本文： | 刘正堂,康沫狂,杨峥.15CrMoVA钢粒状贝氏体回火脆性的研究[J].航空学报,1985,6(3):230-235. |
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| 作者姓名： | 刘正堂 康沫狂 杨峥 |
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| 作者单位： | 西北工业大学
(刘正堂，康沫狂)，西北工业大学(杨峥) |
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| 摘 要： | 研究表明,15CrMoVA钢粒状贝氏体组织存在明显的不可逆回火脆性,且脆性温度范围很宽。脆性是由于M/A岛状组织在回火时的分解所引起。
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| 收稿时间： | 1984-06-05; |
INVESTIGATION ON TEMPER BRITTLENESS OF GRANULAR BAINITE IN 15CrMoVA STEEL |
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| Liu Zhengtang,Kang Mokuang,Yang Zheng.INVESTIGATION ON TEMPER BRITTLENESS OF GRANULAR BAINITE IN 15CrMoVA STEEL[J].Acta Aeronautica et Astronautica Sinica,1985,6(3):230-235. |
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| Authors: | Liu Zhengtang Kang Mokuang Yang Zheng |
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| Institution: | Northwestern Polytechnical University |
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| Abstract: | The mechanism of temper brittleness of the granular bainite caused by the change of microstructure in 15CrMoVA steel during tempering is investigated. It is found that the granular bainite has obvious irreversible tempei brittleness in a wide range of brittle temperatures. The mechanism is proposed as follows. During tempering the M/A island structure decomposes and turns into plate cementite distributed heterogeneously. The undecompo-sed residue of austenite transforms into untempered martensite during tempering cooling. Under impact load, cracks initiate preferably in the plate cementite and untempered martensite. The cracks generate quasicleavage fracture while the toughness of the steel deteriorates. It is recommended that the best tempering temperature range for granular bainite structure should be selected in the temperature range where no remarkable decomposition and transformation of M/A island structure occur in order to obtain a reasonable combination of strength and toughness of the steel. |
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