直接淬火装甲钢的微观组织和性能

Microstructures and Properties of Direct-Quenched Steel

设计和冶炼了一种低碳低合金热轧后直接淬火装甲钢（ＤＱ钢），采用控轧和轧后直接淬火工艺生产钢板。对微观组织和抗弹性能进行了分析，并与ＧＹ４和ＧＹ５装甲钢进行对比。结果表明，热轧后直接淬火钢的变形奥氏体扁平形态保留至淬火组织中，转变后的板条马氏体细小；ＤＱ钢的背面强度极限与中碳ＧＹ４和ＧＹ５钢相当。用ＤＱ钢取代中碳装甲钢大幅度提高焊接性能并节约合金元素，并有望在舰船防护上得到应用。

A low carbon low alloy direct-quenched armor steel was developed by means of controlled rolling and direct-quenching processing. In comparison with GY4 and GY5 armor steels,direct-quenched steel presents the same ballistic limit as that of conventional medium-carbon armor steels.The improvement in ballistic limit is due to the deformed pancaked structure and fine martensite maintained at the steer after hot rolling and direct-quenching quenching.In the foreseeable future, direc-quenching steel may be put into applications in the defence of battle ship because of its improvement in weldability and lean alloy contents.