S.Q. Wang
,
Q.C. Jiang
,
X.H. Cui and Z.M. He(School of Materials Science and Engineering
,
Jilin University of Technology
,
Changchun 130025
,
China) Manuscript received in revised form 15 September 1998
金属学报(英文版)
By the modification, network carbide was disconnected at 1100℃ through uneven dissolution at higher energy places in carbide, where there is twin or lattice distortion,and granulated at 1130℃ through element diffusion. The stability of M7C3 carbide was decreased owing to the modification reducing the segregations of Cr and M0, thus the temperature, at which uneven dissolution of carbide commenced, was decreased. Also lattice distortion or defect such as twin in carbide was increased by the modification, which prompted widespread disconnections in carbide. In addition, the modification prompted element diffusion to accelerate the kinetics process of carbide granulation.
关键词:
ledeburite steel
,
null
,
null
,
null
X.H. Cui
,
Q.C. Jiang
,
S.Q. Wang and Z.M. He (School of Materials Science and Engineering
,
Jinn University of Technology
,
Changchun 130025
,
China)
金属学报(英文版)
Compared with conventional cast Cr12Mo V steel and forged Cr12Mo V steels, carbide morphology and properties of modified cast Cr12MoV steels were investigated by performing hardness test, impact test, fracture toughness test, fatigue crack propagation test, metallographic examination and quantitively metallographic analysis. The results indicate that the carbide morphology in modified cast steel is characterized by granular carbide uniformed- distributed, which is different from that of conventional cast steel, but similar to that of forged steel. The impact toughness of modified cast steel is distinctly increased to 12.75J/cm2 from 6.8J/cm2 in the conventional cast steel with networked carbide, because of carbide granulation. Furthermore, The fracture toughness and fatigue - cock-propagation threshoid of modified cast steel are not only higher than that of the conventional cast steel, but also higher than that of the forged steels.
关键词:
carbide
,
null
,
null
,
null
,
null
姜奉华
,
徐德龙
硅酸盐通报
doi:10.3969/j.issn.1001-1625.2004.06.006
通过研究Q相与C2S和Q相与C4AF的共存条件,构造Q相-C2S-C4AF水泥系统,对此系统水泥形成条件进行研究.研究表明:Q相与C2S和Q相与C4AF能够共存,可以组成Q相-C2S-C4AF-C12A7水泥系统.在Q相-C2S-C4AF-C12A7水泥系统中,Q相在1270℃开始生成,随着温度的升高,Q相的生成量逐渐增大;采用V2O5对β-C2S具有较好的稳定作用.随着C4AF量的增加,Q相的量也在增加,同时,烧成温度降低.
关键词:
Q相
,
Q相-C2S-C4AF水泥
,
形成条件
,
抗压强度
刘军刚
物理测试
Q460C钢板由于冶炼和轧制工艺不稳定,经常出现伸长率不合格的问题.论述了不同的热处理工艺对Q460C性能的影响.研究表明:Q460C经过正火后,强度明显降低.经过正火控冷后,强度、韧性均满足生产要求,提高了产品合格率.
关键词:
Q460C
,
热处理
,
力学性能
段双霞
,
孙建林
,
李志恩
,
富平原
,
雷爱民
钢铁研究学报
在Gleeble-1500热模拟机上测定了Q460C连铸坯的热塑性,深入分析了钢Q460C的高温脆化机理,确定了连铸坯的最佳矫直温度.结果表明,钢Q460C高温脆化受变形速率的影响较大,在第Ⅲ脆性区变形速率越低脆化越严重,实验用钢Q460C的低塑性区确定在660～985℃,连铸坯顶弯、矫直温度应高于985℃,有利于提高塑性,避免连铸坯表面裂纹的产生.
关键词:
Q460C连铸板坯
,
热模拟
,
高温塑性
段双霞
,
孙建林
,
李志恩
,
富平原
,
雷爱民
钢铁研究学报
在Gleeble1500热模拟机上测定了Q460C连铸坯的热塑性，深入分析了钢Q460C的高温脆化机理，确定了连铸坯的最佳矫直温度。结果表明，钢Q460C高温脆化受变形速率的影响较大，在第Ⅲ脆性区变形速率越低脆化越严重，实验用钢Q460C的低塑性区确定在660~985 ℃，连铸坯顶弯、矫直温度应高于985 ℃，有利于提高塑性，避免连铸坯表面裂纹的产生。
关键词:
Q460C连铸板坯;热模拟;高温塑性
吴良芹
,
任娟
上海金属
研究了热轧后超快冷工艺对Q390C钢组织与性能的影响.结果表明:超快冷后Q390C钢的组织为珠光体和铁素体,其屈服强度、抗拉强度和断后伸长率分别可达388 MPa、548 MPa和27.3％,-20℃的冲击功为47 J;超快冷工艺提高了Q390C钢的力学性能.
关键词:
超快冷工艺
,
力学性能
,
组织
,
珠光体
,
铁素体
姜奉华
硅酸盐通报
doi:10.3969/j.issn.1001-1625.2005.06.028
在前人研究Q相合成基础上,采用正交实验的方法,研究了Q相-CA-C12A7体系水泥的烧成条件及水化性能.研究结果表明:在Q相-CA-C12A7系统中,Q相的形成温度在1260～1340℃之间;Q相-CA-C12A7系统水泥烧成的最佳条件是温度为1320℃,保温时间为40min.此水泥具有早期强度高,中期强度提高快,后期强度不发生倒缩.
关键词:
Q相水泥
,
正交实验
,
烧成条件
,
抗压强度
,
微观分析
