为了提高整体式车桥用钢的综合力学性能,对XCQ16-1钢进行了调质热处理工艺研究.通过材料单向拉伸、冲击和硬度等试验,研究了不同回火温度、回火保温时间、淬火温度和淬火保温时间对XCQ16-1钢力学性能的影响规律,制定了试验条件下的调质热处理工艺,并分析了不同工艺参数对材料组织的影响规律.试验结果表明:回火工艺对XCQ16-1钢组织和力学性能的影响比较大,随回火温度的升高和回火保温时间的延长,材料的强度性能下降,塑性和韧性指标上升.经860℃保温30 min淬火+470℃保温90 min回火调质处理后,该材料可获得良好的综合性能.
In order to improve comprehensive mechanical properties of integral axle steel, the quenching-and-tempering process of XCQ16- 1 axle steel was studied. By means of material tensile test, notch-bar impact test and Rockwell hardness test, the effects of tempering temperature, tempering time, quenching temperature and quenching time on structures and mechanical properties of XCQ16 - 1 steel were presented. The relation-ship between microstructure and properties of the steel was also studied. Experimental results indicate that tempering process affects much more than quenching process on structures and mechanical properties of XCQ16 -1 steel. When tempering temperature and time are increased, strength of the steel is depressed, while its tenacity and plasticity are increased. The XCQ16 - 1 steel can achieve excellent performance of strengthening and toughening with the heat treatment process of 860 ℃ quenching after temperature holding for 30 min, and 470 ℃ tempering after temperature holding for 90 min.
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