1Cr18Ni9Ti不锈钢彩色化的研究

提出了１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢在硼酸缓冲液中，在柠檬酸三铵 酸亚铁铵和水合联氨的存在条件下彩色化的可能性，通过正交实验证实了这种可能并得到其彩色化的配方及工艺条件。     

薄壁1Cr18Ni9Ti奥氏体不锈钢的焊接试验

采用钨极氩弧焊的方法,对0.8 mm厚的1Cr18Ni9Ti奥氏体型不锈钢板实施焊接,并通LOM,SEM方法对焊接接头组织及断口形貌进行观察及分析;利用显微硬度计、电子万能拉伸机测量了焊接接头的力学性能.结果表明,通过手工钨极氩弧焊,采用直流正接接法(焊接电流为20 A,焊接速度为20 m/h)能够获得外观平整、组织均匀、力学性能满足要求的焊接接头.     

1Cr18Ni9不锈钢强化氮化

1Cr18Ni9不锈钢为了提高耐磨性而进行氮化,一般在氮化前先在炉外用HCl处理表面氧化膜,此种方法生产周期长且氮化层质量不易保证,本文系根据苏联1958年所创炉内同时处理氧化膜与氮化方法进行实验所得结果写成,内容主要介绍用氯化铵强化氮化过程的理论依据,实验设备,工艺,操作及实验结果等。根据实验结果:1Cr18Ni9钢用HCI处理后在550℃48小的氮化所得氮化层深度为0.07—0、09mm;但用氯化铵在同样加热规范下所得氮化层深度为0.14—0.16mm;若在580℃48小时则为0.18—0.21mm。证明新工艺有强化效果,表面硬度高,氮化层分布均匀,与不脆等优点。     

1Cr18Ni9Ti的电化学抛光

本文研究了1Cr18Ni9Ti在H_3PO_4—H_2SO_4—CrO_3体系中的电化学抛光。探讨抛光液组分的作用、筛选抛光工艺条件、讨论抛光机理,并对比测定了抛光膜的光洁度和耐蚀性。试验表明,采用本文推荐的抛光工艺可得到光洁度高、平整性好、又具有较高耐蚀性的光泽表面。     

ZG1Cr18Ni9Ti的熔炼工艺探索

在100 kg中频快速熔炼炉中,为了减少ZG1Cr18Ni9Ti因熔炼原因造成的夹渣和气孔缺陷,在熔炼操作工艺上,改变了金属钛的加入方法,将传统的一次终脱氧改为两次,严格控制金属钛的加入时机和加入温度,控制金属钛加入后至钢水浇铸完成的时间,按照＂高温出炉、低温浇铸＂的原则,根据产品结构,配合适当的壳模焙烧温度和壳模出炉时间,生产出了外观质量较高的ZG1Cr18Ni9Ti硅溶胶熔模精密铸造零件.     

1Cr18Ni9Ti钢焊缝金属的氢脆

应用系列温度冲击试验方法,研究了1Cr18Ni9Ti钢焊缝金属的氢脆敏感性,发现氢使焊缝金属的冲击韧性降低,且随温度减低而加剧,断口表面的磁性测量及X射线衍射分析均表明:氢抑制了α′马氏体的生成。     

T2铜管和1Cr18Ni9Ti不锈钢管的焊接

根据镍在紫铜和不锈钢中可无限固溶,对紫铜管和不锈钢管的焊接,采用纯镍作过渡焊缝,采取合适的工艺措施,通过试验,成功地解决了其焊接接头中易出现裂纹的问题。     

T2铜管和1Cr18Ni9Ti不锈钢管的焊接

根据镍在紫铜和不锈钢中可无限固溶，对紫铜管和不锈钢管的焊接，采用纯镍作过渡焊缝，采取合适的工艺措施，通过试验，成功地解决了其焊接接头中易出现裂纹的问题。     

Semi-solid slurry preparation and rolling of 1Cr18Ni9Ti stainless steel

The preparation and rolling of the semi-solid slurry 1Cr18Ni9Ti stainless steel were researched. The experimental results show that when stirred for 2-3 min under the given test condition, the semi-solid slurry with about 50%-60% (volume fraction) solid and the spherical primary austenitic grains in the size of 100-200μm can be obtained, and it is easy to be discharged from the bottom little hole of the stirring chamber. The semi-solid slurry of 1Cr18Ni9Ti stainless steel can be rolled into the given plate successfully. However, the solid phase and liquid phase are easily separated in the rolling process, so that the solid primary austenitic grains are concentrated in the center and the liquid phase is near the edge of the rolled plate. The strengths of the plate rolled in the semi-solid state are higher than that of the traditionally repeated hot-rolled plate of 1Cr18Ni9Ti stainless steel.     

00Cr18Ni10N钢高温持久强度的预测与验证

研究了00Cr18Ni10N钢的高温持久强度.在Larson-Miller方程基础上,利用全微分和状态函数特征,建立了00Cr18Ni10N钢在给定温度条件下持久强度与高温抗拉强度之间关系的数学模型.通过试验结果表明,利用该数学理论模型预测00Cr18Ni10N钢在700℃,持久拉伸200h理论与实测持久强度值相符,相对误差为0.6%.     

Effect of sulphate-reducing bacteria on the electrochemical impedance spectroscopy characteristics of 1Cr18Ni9Ti

The electrochemical characteristics of 1Cr18Ni9Ti in sulphate-reducing bacteria (SRB) solutions and the biofilm of SRB on the surface of the 1Cr18Ni9Ti electrode were studied by electrochemical, microbiological, and surface analysis methods. Electro- chemical impedance spectroscopy (EIS) of 1Cr18Ni9Ti was measured in the solutions with and without SRB at the culture time of 2, 4, 8 d, respectively. The measurement used two test methods, the nonimmersion electrode method and the immersion electrode method. It was found that the polarization resistance (Rp) of 1Cr18Ni9Ti in the solutions without SRB is the greatest for each test method. When using the nonimmersion electrode method, Rp shifts negatively at first and then positively, and the time constant is only one. Although using the immersion electrode method, the Rp shifts positively at first and then negatively, and the time constant also changes when the biofilm forms. The biofilm observed through SEM is with pores. It was demonstrated that SRB has acceler- ated corrosion action on 1Cr18Ni9Ti. The protection effect of the biofilm on the electrode depends on the compact degree of the film.     

酸性环境中1Cr11Ni2W2MoV不锈钢的腐蚀行为

由于腐蚀而导致的表面质量的退化是构件使用过程中一种非常重要的破坏形式,对材料耐腐蚀性能分析,将有助于预测构件在腐蚀环境下的剩余寿命和防腐设计.以5%NaCl和稀H2SO4构成的偏酸性溶液模拟实际服役环境,利用扫描电镜和能谱分析技术研究了1Cr11Ni2W2MoV不锈钢的腐蚀破坏机理.研究表明:在该腐蚀溶液中,Cl-加速了阳极金属的溶解,并破坏了Cr2O3的保护膜.在腐蚀的前期阶段Fe元素为阳极金属,随着腐蚀程度的增加Cr元素逐渐累积、聚集并逐渐超过局部剩余基体材料中的Fe元素,成为阳极金属.