共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
低碳贝氏体钢通常需要添加一定量合金元素来提升性能,为了研究合金元素铬和铝在低碳贝氏体钢中的作用,以Fe-C-Si-Mn-Mo系贝氏体钢为基础,设计了单独添加铬元素和复合添加Cr+Al元素的3种低碳贝氏体钢,研究了铬和铝的添加对连续冷却处理低碳贝氏体钢显微组织、力学性能及贝氏体相变的影响规律。结果表明,连续冷却条件下,铬可以促进低碳贝氏体钢相变趋向于更低的温度区间进行,细化贝氏体组织,从而提高强度;铝可以促进贝氏体相变动力学,但对低碳贝氏体钢意义不大。同时,添加铝会使低碳贝氏体钢组织粗化,导致强度和伸长率同时下降。综合来看,复合添加铬和铝的优化效果不如单独添加铬,单独添加铬的低碳贝氏体钢强度达到1 623 MPa,伸长率为10.5%,结果可以为低碳贝氏体钢成分设计提供依据。 相似文献
4.
设计了含Ni和无Ni两种纳米结构贝氏体钢种,进行了不同温度下等温淬火热处理实验,目的是研究Ni对等温淬火纳米结构贝氏体钢相变、组织和性能的影响。结果表明,与连续冷却工艺不同,在等温淬火过程中,Ni元素的添加降低了贝氏体相变驱动力,减少贝氏体体积分数,同时使TTT曲线右移,减慢等温贝氏体相变动力学。此外,在等温淬火后,Ni元素的添加提高钢的冲击性能,但由于贝氏体量的减少和残余奥氏体的增多,使钢的拉伸性能降低。其次,随着相变温度的升高,含Ni钢和无Ni钢的强塑积略有增加。 相似文献
5.
6.
7.
8.
9.
10.
11.
The rust layer plays an important role in the corrosion of steel in chlorinated environments. Salt spray, potentiodynamic polarization curve and tensile test were conducted in laboratory for the specimens after two-stage heat treatment. The influence of the alloying elements on mechanical properties and corrosion resistance of three kinds of steels was investigated by observing the microstructure and the morphologies of rust layer. The results show that the highest value (29%) of total elongation for steel A is obtained. The mechanical property of the specimen for steel C exhibits best strength ductility balance (21384 MPa·%) because of the presence of the multiphase microstructures after a two-stage heat treatment and the addition of the alloying elements. The corrosion products are known to be a complex mixture of Fe3O4, Fe2O3 and α-FeOOH for steel C. The presence of the alloying elements results in the formation of compact and dense rust layers in steel B and C. Passive film protects the substrate of TRIP (transformation induced plasticity) steel containing a complex mix of multiphase. Superior corrosion performance is exhibited for steel C with low alloying contents due to the enrichment of alloying elements within the rust layers. 相似文献
12.
13.
14.
对Cr-Mo系列有代表性钢种SCM822H的临界点、连续冷却曲线进行了测试,探讨了不同热处理状态对其晶粒度、组织和性能的影响,为进一步优化和完善该钢的生产工艺提供了理论依据。 相似文献
15.
经济型双相不锈钢的研发进展 总被引:1,自引:0,他引:1
经济型双相不锈钢是一种高性能低成本的氮合金化不锈钢新材料,具有典型的铁素体-奥氏体双相组织。利用氮取代镍元素的奥氏体化作用,降低成本的同时获得优良的力学性能和耐腐蚀性能。介绍了经济型双相不锈钢的发展历史,重点讨论了合金元素和热处理对相变、力学性能和耐腐蚀性能的影响规律,并与304和316进行对比;同时,分析了经济型双相不锈钢焊接性能和焊接工艺的研究进展。经济型双相不锈钢S32101、S32003、S32202等,已用于核电、桥梁、建筑、热交换器等行业,取代传统奥氏体不锈钢AISI 304和316。由于经济型双相不锈钢具有高强度和优良耐蚀性,同时镍、钼等贵金属的含量都较低,已成为未来不锈钢发展的方向之一。 相似文献
16.
介绍了唐钢重机装备公司采用EBT-LF工艺,冶炼超低硫磷含量、高力学性能的铸钢节点用钢G20Mn5QT的实践,重点分析了影响产品性能的关键元素控制要求及操作流程的控制要点。实践证明,采用EBT-LF工艺冶炼的G20Mn5QT钢完全能够满足铸钢节点用钢要求。 相似文献
17.
知识产权已经成为了全球行业竞争的核心要素,如何迅速提高我国钢铁企业自主知识产权创造力,是提高我国钢铁业核心竞争力的关键。通过调查国内大型钢铁企业的专利申请量,分析我国钢铁企业的知识产权创造力现状及存在问题,并提出如何提高我国钢铁企业知识产权创造力的对策。 相似文献
18.
为了确保原油储罐用钢的大热输入焊接性能,试制中重点控制T610E钢的化学成分,分析大热输入性能的机理,并进行了焊接热模拟试验。试制结果表明,太钢生产的T610E钢具有优良的大热输入焊接性能,满足了大型原油储罐工程建造的要求。 相似文献
19.
CUI Xiang-hong SHAN Jun YANG Zi-run WEI Min-xian WANG Shu-qi DONG Chuang 《钢铁研究学报(英文版)》2008,15(4):67-72
The alloying design of cast hot-forging die steels was analyzed. The relationship of the life of cast hot-forging dies with the failure patterns was studied. The thermal wear resistance was believed to be the key property for the alloying design of cast hot-forging die steels. The alloying design parameters were selected and optimized for the cast hot-forging die steel with high wear resistance. The wear resistance of the optimized cast die steel was evaluated in comparison with commercial H13 steels and 3Cr2WSV steel. In the new cast hot-forging die steel, VC is predominant carbide with Cr and Mo as the main solution elements in α-Fe. It is found that the cast die steel has significantly lower wear rate than normal H13 steel and 3Cr2W8V steel, almost the same as that of high purity H13 steel. The high wear resistance of the new cast hot-forging die steel can be attributed to its reasonable alloying design and nonsensibility to the detrimental function of S and P. 相似文献