对D6 A钢热轧板进行了两相区轧制及退火处理,获得超细晶 D6 A 合金钢样品,微观结构特征为纳米尺寸的球粒状渗碳体弥散分布于亚微米尺寸的铁素体组织中.实验结果表明：随着退火温度由550℃升高至650℃,铁素体晶粒被拉长现象逐渐减弱直至消失,晶粒尺寸呈现先减小后增大的趋势,在550℃时达到最小尺寸400 nm；同时渗碳体尺寸逐渐由70增加至140 nm,其质量分数分数由9.6％降低至3.6％；随着退火温度升高,实验钢沿α和γ取向线分布的{112}＜110＞、{111}＜112＞和{001}＜110＞织构强度逐渐减弱,600℃退火后消失,{110}＜001＞与{112}＜111＞织构逐渐增强,硬度随退火温度升高由472 HV逐渐减小至423 HV.细晶强化、纳米尺寸渗碳体的析出强化,以及织构强化的共同作用是超细晶D6 A钢的主要强化机制.
Ultrafine-grained D6A steels were achieved by intercritical rolling and annealing,and the microstructure features show that nanoscale spherical cementite depressively distributes in ferrite matrix.Experiment results show that ferrite lath gradually became granular and large with increasing annealing temperature from 550 ℃ to 650℃.After annealing at 550℃ for 300 s,the grain size reaches the smallest size of 400 nm.The size of spherical cementite increases from 70 to 140 nm with annealing temperature increasing from 550 to 650 ℃,and the mass fraction decreases from 9.6% to 3.6%.Meanwhile,the texture components alongαandγorientation distribution lines such as{112}<110>,{111}<112> and {001}<110> gradualy weaken and disappear after annealing at 650℃ for 300 s.However,{110}<001> and {112}<111> misorientations gradually enhance concurrently.Micro-hardness of the steel decreases from 472 HV to 423 HV with the increase of annealing temperature.Ultrafine-grained fer-rite,nanoscale spherical cementite and special textures are important factors in strengthening D6 A steel.
参考文献
| [1] | 徐盛;刘雅政;周乐育;闫永明.热处理对45CrNiMoV钢析出相和力学性能影响[J].材料热处理学报,2014(3):127-132. |
| [2] | Derming Lian.Microstructure properties of tempered D6ac steel[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2013Jan.1(Jan.1):100-104. |
| [3] | 姜树田.45CrNiMo1V超高强度钢研制及应用[J].固体火箭技术,1995(04):63. |
| [4] | Shyh-Chi Wu;Kuang-Hung Tseng;Hua-Chiang Wen;Ming-Jhang Wu;Chang-Pin Chou.Tribological behavior of electron beam D6ac weldment[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2013Jan.1(Jan.1):45-51. |
| [5] | Lee, Y.-W.;Son, Y.-I.;Lee, S.-J..Microstructure and mechanical properties of spheroidized D6AC steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2013:94-99. |
| [6] | 杜林秀;姚圣杰;熊明鲜;王国栋.低碳结构钢的奥氏体晶粒超细化[J].东北大学学报（自然科学版）,2007(11):1575-1578. |
| [7] | 王佳夫;花福安;刘振宇;王国栋.热变形双相不锈钢的微区取向及组织分析[J].钢铁研究学报,2012(4):42-46. |
| [8] | 刘沿东;杨一俏;毕洪运;左良.热轧温度对436不锈钢热轧织构的影响[J].钢铁研究学报,2011(3):35-38. |
| [9] | 刘沿东;叶晓宁.Nb、Ti对铁素体不锈钢铸态及热轧态组织、织构的影响[J].铸造,2013(10):944-947. |
| [10] | 李四军;曲家惠;王福;左良.铁素体区热轧IF钢冷轧退火时织构的形成与演变[J].东北大学学报（自然科学版）,2007(3):345-348. |
| [11] | 刘国平;王海军;陈浩;项利;仇圣桃;王建军.普通取向硅钢轧制过程中组织和织构的演变[J].钢铁研究学报,2014(11):40-44. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%