High Temperature Deformation Behavior of Fe-9Ni-C Alloy

 The high temperature deformation behavior of the 9Ni steel has been studied by the Gleeble-3500 tester. The relationship between deformation resistance and deformation degree, deformation temperature and deformation rate was revealed. The results show that when the deformation degree is less than 02, the deformation resistance increases by about 70 to 200 MPa, while the deformation degree varied between 02 and 04, the deformation resistance increases by about 30-40 MPa, when the deformation degree is larger than 04, the deformation resistance increases slowly, some become stable gradually. The influence of deformation temperature on deformation resistance is larger, and deformation resistance at higher temperature is about 160 MPa smaller than at lower temperature. Higher deformation rate leads to larger deformation resistance. The deformation resistance increases about 70 to 110 MPa with the increase of the deformation rate. A new and highly accurate mathematical model of the steel was established to describe the deformation behavior during rolling.     

含铌微合金带钢精轧过程中的再结晶行为

介绍了含铌微合金带钢在精轧过程中的再结晶行为。在不同条件下，含铌钢将发生静态再结晶、动态再结晶和亚动态再结晶，而且沉淀的析出对再结晶有不同程度的影响。     

控轧控冷工艺对DH36级船体用结构钢低温韧性的影响

通过合理的化学成分设计,采用不同的控轧控冷工艺,对DH36船板钢在生产试制过程中产生的-40℃纵向冲击功波动较大的现象进行了研究。研究表明,降低Ⅱ阶段的开轧温度,增大未再晶区的变形量（〉60％）,结合合理的控冷工艺,能有效提高DH36级船板钢的综合性能,尤其是钢的低温韧性。     

高应变率下00Cr23Ni4N双相不锈钢的热变形行为

 采用Gleeble-3800热力学模拟试验机对00Cr23Ni4N双相不锈钢进行了高温压缩试验,研究了其在900～1150℃、5～50s-1条件下的热变形行为,并利用Sellars双曲正弦模型建立了峰值流变应力与Zener-Hollomon（Z参数）之间的关系。研究结果表明,00Cr23Ni4N双相不锈钢的高温流变应力随变形温度的升高、应变速率的减小显著降低;在变形温度为1100～1150℃,材料均表现出良好的热加工性能;通过回归分析,00Cr23Ni4N双相不锈钢的应力指数为2.6,热变形激活能为263.4kJ/mol,Z参数能较好地描述该钢种的流变行为。     

15钢在双相区控制轧制时的组织变化

研究了不同控制轧制工艺下１５钢的组织变化。发现，１５例轧制前先奥氏体化比直接轧制更能促进铁素体的动态回复过程，而且当形变量较大时，发生几何学动态再结晶，但形变诱发相变的现象不明显。     

不锈钢/铝/不锈钢轧制复合工艺的研究

不锈钢／铝／不锈钢异种金属的复合可以通过轧制来实现，在复合中各金属组元的变形程度以及复合材料的结合强度均随工艺条件的不同而有所不同。轧制复合材料可以获得良好的综合力学性能，因此，随着对它的进一步研究，势必在建筑装饰和炊具行业得到广泛的应用和推广。     

Microstructure Evolution and Precipitation Behavior of 0Cr16Ni5Mo Martensitic Stainless Steel during Tempering Process

The microstructure,morphology of precipitates and retained austenite and the volume fraction of retained austenite in 0Cr16Ni5 Mo stainless steel during the tempering process were analyzed using optical microscope(OM),transmission electron microscope(TEM),X-ray diffraction(XRD)and scanning transmission electron microscope(STEM).The results show that the microstructure of the tempered steel is mainly composed of tempered martensite,retained austenite,and delta ferrite.In the case of samples tempered from 500 to 700 ℃,the precipitates are mainly M_(23)C_6,which precipitate along the lath martensite boundaries.The precipitate content increases with the tempering temperature.During the tempering process,the content of retained austenite initially increases and then decreases,the maximum content of retained austenite being 29 vol.% upon tempering at 600 ℃.TEM analysis of the tested steel reveals two morphology types of retained austenite.One is thin film-like retained austenite that exists along the martensite lath boundary.The other is blocky austenite located on packet at the boundary and the original austenite grain boundary.To further understand the stability of reversed austenite,the Ni content in reversed austenite was measured using STEM.Results show a significant difference in nickel concentrations between reversed austenite and martensite.     

合金元素对0Cr17Ni4Cu4Nb不锈钢组织与力学性能的影响—镍（4）

实验室研究了Ni含量对0Cr17Ni4Cu4Nb不锈钢组织与力学性能的影响,通过力学性能测试和金相显微组织和TEM结构分析,研究结果表明：随Ni含量的增加,δ-铁素体含量减少,As点降低;在相同回火温度下,随Ni含量的提高,强度增加。随淬火冷却速度的降低,强度下降,且Ni含量越高,强度下降的幅度越小;随时效后冷却速度的降低,强度增加,且Ni含量越高,强度增加的幅度越大。Ni含量控制在中上限容易满足技术条件的要求。