正火温度对超厚13MnNiMoR钢板低温冲击韧性的影响  

Effect of Normalizing Temperature on Low-temperature Impact Toughness of Ultra-thick 13MnNiMoR Steel Plate

作　　者：冯路路 董威威 刘玲 FENG Lulu;DONG Weiwei;LIU Ling(School of Mechanical Engineering,Jingchu University of Technology,Jingmen 448000,China)

机构地区：[1]荆楚理工学院机械工程学院,湖北荆门4448000

出　　处：《热加工工艺》2023年第2期133-135,共3页Hot Working Technology

基　　金：湖北省教育厅科学研究计划项目(Q20184302);荆楚理工学院校级科学研究项目(YB201902,PY202004)。

摘　　要：采用不同的正火温度对超厚规格13MnNiMoR进行了热处理试验。结合金相显微镜、拉伸试验机和冲击试验机对不同热处理工艺的试验钢进行了显微组织观察和力学性能的测定。结果表明:正火温度对试验钢强度性能影响不大。860℃正火+650℃回火工艺下,试验钢的低温冲击韧性要明显优于930℃正火+650℃回火工艺下的低温冲击韧性。主要是因为较低的正火温度可以细化正火加热过程中的奥氏体晶粒,在随后空冷过程中,得到细小的铁素体晶粒,从而在室温条件下获得大量的铁素体晶界,大大地提高了吸收冲击能量的能力。The heat treatment tests of super thick specification 13MnNiMoR were carried out with different normalizing temperatures. The microstructure and mechanical properties of the test steel in different heat treatment processes were measured and determined by means of metallographic microscope, tensile testing machine and impact testing machine. The results show that normalizing temperature has little effect on the strength and properties of the test steel. At 860 ℃normalizing+650 ℃ tempering process, the low-temperature impact toughness of the test steel is obviously better than that of 930 ℃ normalizing+650 ℃ tempering process. The main reason is that the austenite grains in the normalizing heating process can be refined at a lower normalizing temperature. In the subsequent air cooling process, fine Ferrite grains are obtained. Thus,a large number of ferrite grain boundaries are obtained at room temperature, which greatly improves the ability to absorb impact energy.

关 键 词：正火温度 超厚板 13MnNiMoR钢 低温冲击韧性 晶界 

分 类 号：TG161[金属学及工艺—热处理]