Effect of Chemical Composition and Heat Treatment on Mechanical and Corrosion Properties of High-Chromium Nitrogen Steels

The effect of alloying of high-chromium nitrogen steels with manganese and nickel on their mechanical and corrosion properties is studied. Preferred modes of heat treatment providing the best combination of properties are presented.     

Effect of Homogenization on the Structure and Properties of Corrosion-Resistant Steels

Metal Science and Heat Treatment - The effect of homogenizing heating on the structural state (titanium sulfide morphology, δ-ferrite shape and content, grain size, excess phase precipitates,...     

Heat Treatment and Properties of Nitrogen Alloyed, Martensitic, Corrosion-resistant Steels

This paper gives a short introduction to the typical process route and material properties of these steels in comparison to standard martensitic corrosiun-resistant steels. The typical response of these steels to various heat treatment parameters is shown and explained using the three grades M333, N360 and M340 (all made by Boehler Edelstahl GmbH) as examples, and the physical metallurgy of these steels and its consequences for practical heat treatment is explained. The correlation between tempering parameters and their effect on the toughness and corrosion properties is explained in particular detail, showing that these new steels not only offer far better properly combinations under the usual heat treatment parameters than standard martensitic corrosion-resistant steels, but that they also open the door to extending heat treatment combinations and properties.     

Mechanisms of the Influence of Nitrogen on the Structure and Properties of Steels (A Review)

Special features of the structure of nitrogen-containing steels and the role of nitrogen in their hardening are considered. The following mechanisms of the action of nitrogen on the structure and properties of steels are analyzed: change in the state of solid solutions, shifting of the temperature of phase equilibria, segregation of nitride particles, interaction between nitrogen atoms and defects of crystal structure, and effect of nitrogen on the electron subsystem of the metal.     

热处理对铸造高速钢组织与性能的影响

研究了热处理工艺对铸态和变质处理铸造高速钢组织与性能的影响。结果表明:变质处理可以使高速钢组织得到细化,同时改变钢中网状共晶碳化物的形貌,使高速钢的硬度和耐磨性得到提高;铸态高温加热、退火、淬火和回火等热处理工艺对铸造高速钢中碳化物的形貌影响不大。铸态和变质处理高速钢退火时,随着加热温度的升高,硬度逐渐升高;淬火+回火和铸态直接回火的高速钢随着回火温度的升高,硬度和耐磨性逐渐升高,在560℃三次回火时获得最高的硬度及室温耐磨性,且与锻造高速钢相当。     

热处理对铸造高速钢组织与性能的影响

研究了热处理工艺对铸态和变质处理铸造高速钢组织与性能的影响.结果表明：变质处理可以使高速钢组织得到细化,同时改变钢中网状共晶碳化物的形貌,使高速钢的硬度和耐磨性得到提高;铸态高温加热、退火、淬火和回火等热处理工艺对铸造高速钢中碳化物的形貌影响不大.铸态和变质处理高速钢退火时,随着加热温度的升高,硬度逐渐升高;淬火＋回火和铸态直接回火的高速钢随着回火温度的升高,硬度和耐磨性逐渐升高,在560℃三次回火时获得最高的硬度及室温耐磨性,且与锻造高速钢相当.     

耐候钢热处理双相化组织与性能

研究了铁路机车车辆用的两种热轧耐候钢经热处理双相化的的金相组织及各种力学性能,结果表明,耐候钢双相化后的显微组织由多边形等轴铁素体晶粒和不规则岛状马氏体组成,且原始组织对其有很大影响;两种热轧耐候钢双相化热处理前后的显微镜组织和力学性能均无明显的各向异性,研究发现,双相化加热温度对马氏体含量,铁素体晶粒大小,屈服现象,屈服强度、抗拉强度、屈强比、伸长率及加工硬化指数（n值）等双相化钢的组织和性能均有显著影响,根据试验结果,确定的耐候钢最佳热处理双相比工艺为780℃加热,10％NaCl水溶液淬火,本研究成果将为进一步采用控制轧制法进行耐候双相钢的生产奠定基础。     

热轧工艺对低碳铝镇静钢组织性能的影响

摘 要:借助于金相显微镜和X射线衍射仪及拉伸试验机研究了热轧温度对低碳铝镇静钢(SPHE)热轧板的组织和织构及性能的影响.结果表明:化学成分基本相同但热轧工艺参数差别较大时,金相组织、织构及力学性能差异显著.终轧温度高而卷曲温度低的热轧成品板的晶粒尺寸小,热轧织构为弱的不完全α、γ纤维织构,热轧成品板的力学性能良好;终轧温度低而卷曲温度高的热轧成品板存在严重的混晶,热轧织构为不完全的α纤维织构,对深冲性能不利,冲压性能不能满足用户的需求.     

等离子体渗氮气压对合金钢渗氮层微观结构和性能的影响

目的 选择M50NiL钢（高合金钢）和AISI 4140钢（低合金钢）2种合金钢,研究渗氮气压对合金钢等离子体渗氮层组织结构、渗层厚度、硬度、韧性和摩擦磨损性能的影响规律。方法 根据离子渗氮GB/T30883—2017,在0～500 Pa渗氮气压范围内选择170、250、350 Pa 3个渗氮气压进行等离子体渗氮,研究渗层微观结构和性能。结果 对于M50NiL和AISI 4140两种合金钢,350 Pa时渗层厚度均最大,170 Pa次之,250 Pa厚度最小。M50NiL钢在350 Pa渗氮和AISI 4140钢在170 Pa渗氮时,表面层具有最优的强韧性。摩擦磨损性能显示,170 Pa和350 Pa气压渗氮的摩擦磨损性能明显优于250 Pa气压渗氮,其中磨损率规律与渗氮层的韧性值测试结果吻合。结论 气压影响了氮离子的能量和分布,从而影响了渗层厚度,钢中的合金元素含量和气压共同影响表面强韧化效果,并且表面强韧化效果直接影响渗氮层的摩擦磨损性能。     

热处理工艺对超高碳钢显微组织及磨损性能的影响

研究了不同热处理条件下超高碳钢的微观组织,分析了滑动速度和载荷对其摩擦磨损性能的影响.结果表明,球化退火后,其组织由铸态时的细片状珠光体加网状碳化物变成球状或粒状的珠光体;正火后,高碳钢组织转变为片状珠光体加颗粒状碳化物;淬火+低温回火后,碳钢组织转变成回火马氏体.在球化退火、正火及淬火条件下,材料的摩擦系数均随滑动速度和载荷的增大而减小;磨损率则随载荷的增大而增大,随滑动速度的增大而减小.在相同条件下,高碳钢在淬火+低温回火处理后的摩擦系数和磨损率明显低于球化退火后的摩擦系数和磨损率.     

控冷处理对中高碳Si-Mn无碳化物贝氏体钢的组织与性能的影响

探索了控制冷却热处理工艺对中高碳Si-Mn无碳化物贝氏体钢的组织和力学性能的影响。结果表明，中高碳Si-Mn钢经控冷工艺处理后在很宽的工艺参数范围内能够获得无碳化物贝氏体组织；随着试样在油中冷却时间的延长，块状残留奥氏体量不断减少，残留奥氏体薄膜含量不断增加；材料的强度、塑性和韧性随着油冷时间的延长而不断增加。材料经油中冷却7s～8s后在空气炉中360℃保温3600s～5400s处理具有最好的强度、塑性和韧性。这主要归因于残留奥氏体薄膜良好的机械稳定性和热稳定性及在机械载荷作用下的TRIP效应。     

Stability of Structure and Properties of Nitrogen High-Strength Austenitic Steels Under Cyclic Thermal and Mechanical Loads

Metal Science and Heat Treatment - Stability of the structure and mechanical properties of high-strength cryogenic nonmagnetic steels 10Kh19G10N6AM2 and 09Kh19G10N6AM2D2 under long-term...     

稀土对硼锆共渗过程的活化催渗及其组织和性能的影响

在粉未硼锆渗剂中加入稀土元素,可使渗速提高26%。共渗层主要由(FeZr)_2B相组成,同时还渗入了微量的La、Ce、Pr元素。与渗硼、硼稀土共渗、硼锆共渗相比,硼锆稀土共渗层的耐磨性和耐蚀性好,尤其是韧性有明显提高,其脆断前吸收的功同渗硼相比提高了70%。     

建筑结构钢的焊接性能研究

对建筑结构钢进行了多道次激光复合焊接,对比分析不同线能量、焊接速度的焊接试件的焊接性能。结果表明,在线能量为8 k J/cm、焊接速度为1.05 m/min时,建筑结构钢具有较好的硬度、低温冲击韧度和弯曲性能。这主要是因为在焊缝区域存在着针状铁素体、粒状贝氏体和马氏体组成的多相组织,使得焊缝具有较好的强塑性。     

Effect of Heat Treatment on Phase Transformation Texture and Mechanical Properties in Hot-Rolled High-Strength Steels

Metal Science and Heat Treatment - The effect of heat treatment on the phase transformation texture and mechanical properties of hot-rolled high-strength automotive steels with different chemical...     

Effect of Heat Treatment on Microstructures and Mechanical Properties of Hot-Dip Galvanized DP Steels

In order to simulate the hot-dipped galvanizing of dual-phase(DP) steel(wt%) 0.15C–0.1Si–1.7Mn, the DP steels were obtained by different annealing schedules. The effects of soaking temperature, time, and cooling rate on ferrite grain, volume fraction of martensite, and the fine structure of martensite were studied. Results showed that the yield strength(YS) of DP steel is sensitive to annealing schedule, while total elongation has no noticeable dependence on annealing schedule. Increasing soaking temperature from 790 to 850 °C, the YS is the lowest at soaking temperature of 850 °C. Changing CR1 from 6 to 24 °C/s, the YS is the highest when CR1 is 12 °C/s. Increasing soaking time from 30 to100 s, the YS is the lowest at soaking time of 100 s. Besides, it was found that sufficient movable dislocations within ferrite grains and high martensite volume fraction can eliminate yield point elongation, decrease the YS, and increase ultimate tensile strength. Through TEM observations, it was also found that increasing annealing temperature promotes austenite transformation into twin martensite, and increases volume fraction of martensite at sufficient cooling rate. With increasing the martensite volume fraction, the deformation substructure in the ferrite is well developed.