奥氏体不锈钢应力腐蚀分析研究

详细论述了奥氏体不锈钢应力腐蚀断裂发生的条件、特征、原因和解决方法，为分析和解决奥氏体不锈钢应力腐蚀失效的问题提供了重要依据。     

321奥氏体不锈钢单晶应力腐蚀断口的研究

本文观察了３２１奥氏体光盘钢在沸腾的４２％ＭｇＣｌ２溶液中的应力腐蚀行为。     

氢致马氏体对304不锈钢在MgCl2中应力腐蚀的影响

通过电解充氢后除气，即可在304奥氏体不锈钢中引入不同数量的氢致马氏体（ε α′，其中ε占2/3），同时并未明显改变试样的强度和位错密度，氢致马氏体使304不锈钢脆化，塑性损失随马氏体含量升高而升高，在沸腾MgCl2溶液中慢应变速率拉伸实验表明，随氢致马氏体含量升高，应力腐蚀敏感性也升高，但当马氏体总量超过10%之后，应力腐蚀敏感性逐渐趋势地一个稳定值。     

奥氏体不锈钢炉体应力腐蚀破裂失效分析

３１６Ｌ不锈钢是一种耐蚀性能很好的材料,但是安装质量特别是焊接质量对其应力腐蚀破裂（ＳＣＣ）性能很有很大的影响,本文针对某厂多次沿焊接热影响区（ＨＡＺ）发生断裂事故的一套３１６Ｌ不锈钢设备进行了失效分析。认为该设备的断裂属于ＳＣＣ,焊接的质量差是造成断裂的根本原因。     

奥氏体不锈钢副照促进应力腐蚀破裂的模拟研究

本文从材料成分、水化学环境和辐照粒子等方面叙述了奥氏体不锈辐照促进应力腐蚀破裂的模拟研究方法和相关模拟研究取得的进展。这类模拟研究在核电材料的研究中占有相当的地位。     

310奥氏体不锈钢应力腐蚀的透射电镜原位观察

用自制的恒位移加载台，在透射电镜中原位观察310奥氏体不锈钢在纯水中局部溶解前后裂尖位错组态的变化以及微裂纹的形核和扩展。结果表明，310奥氏体不锈钢在室温纯水中局部阳极溶解能促进位错发射，增殖和运动，在低应力下，纳米级微裂纹在无位错区中连续或不连续形核，由于介质的作用，纳米级微裂纹并不钝化成空洞或缺口，而是解理扩展。     

连多硫酸溶液中奥氏体不锈钢的应力腐蚀开裂

评述了奥氏体不锈钢在连多硫酸溶液中的应力腐蚀开裂叙述环境、钢中碳含量、热处理、应力等因素的作用.讨论防止应力腐蚀计裂的措施     

钝化膜应力导致不锈钢应力腐蚀

用恒位移载台，在透射电镜（TEM）中原位观察应力前后裂前方位错组态的变化以及微裂纹的形核和扩展，结果有明，310不锈钢在沸腾的25％MgCl2水溶液中应力腐蚀时腐蚀过程能促进位错发射，增殖和运动，当腐蚀促进的位错发射和运动达到临界状态时，应力腐蚀裂纹形核和扩展，测量表明，304不锈钢在沸腾MgCl2中自然腐蚀时表面钝化膜会产生一个附加拉应力，它可能是腐蚀促进位错发射和运动的原因。     

SCF FEATURE OF AUSTENITIC STAINLESS STEEL IN BOILING MgCl_2SOLUTION

Corrosion fatigue under the load of low frequency and bigh mean stress has been generallydefined as stress corrosion fatigue(SCF).It is a specific failure process due to the inter-action between stress corrosion cracking(SCC) and corrsion fatigue(CF),the effectsof which on fracture characteristics,including crack initiation and propagation.servicelife and cracking mode have not been investigated systematically.The purpose of this pa-per was to study the environment-sensitive fracture behaviour of OCr18Ni9Ti austeniticstainless steel under the load of different fiequencies and high mean stress in boilingMgCl_2 solution.The interaction between SCC and CF would be emphasized.     

EFFECT OF POTENTIAL ON INTERACTION BETWEEN STRESS CORROSION CRACKING AND CORROSION FATIGUE OF AUSTENITIC STAINLESS STEEL IN BOILING 42% MgCl_2 SOLUTION

The environment-sensitive fracture behaviour of 0Cr18Ni9Ti austenitic stainless steel inboiling 42% MgCl_2 under the specific load of low frequency and high mean stress was inves-tigated from the relations and differences of crack growth rates and fractographs betweenstress corrosion fatigue and stress corrosion cracking.The interaction between stress corro-sion cracking and corrosion fatigue was also studied from fracture characteristics with empha-sis on the effects of applied potential on the interaction.     

外加电位对奥氏体不锈钢应力腐蚀与腐蚀疲劳交互作用的影响SCIEI

本文研究了0Cr18Ni9Ti奥氏体不锈钢在42%沸腾MgCl_2中,在低频,高平均应力循环载荷下的环境敏感断裂行为,研究了应力腐蚀疲劳与应力腐蚀在裂纹扩展规律及断口形貌上的差别与联系。从断裂特征上分析了应力腐蚀与腐蚀疲劳的交互作用,并着重研究了外加极化电位对这种交互作用的影响。     

MIXED MODE SCC OF 18-8 STAINLESS STEEL IN BOILING 42% MgCl_2 SOLUTION

A series of mixed mode tests were carried out on 18-8 stainless steel in boiling42% MgCl_2 solution.The results show that for any K_Ⅱ/K_Ⅰ ratio,the SCC direction coin-cides well with the crack tip maximum normal stress plane,while the SCC resistance of thematerial reduces as the ratio of K_Ⅱ/K_Ⅰ increases.The experimental results were discussed inthe light of anode dissolving mechanism and the effect of mixed mode loading on crack tipstress and strain.It is concluded that for fracture analysis if mixed mode cracks were simplytaken into account as mode Ⅰ cracks,and only mode Ⅰ testing results as mode Ⅰ fracture criter-ion were employed,it may not be safe.     

SCC MECHANISM OF STAINLESS STEEL AISI 321 IN ACIDIC CHLORIDE SOLUTION

It is verified that stainless steel AISI 321 is in the active anodic dissolution state in 0.5mol/L HCll+0.5 mol/L NaCl solution at 55℃.The SCC of the steel in the solution cannot be reasonably explained by passive film rupture-nepasivation theory and by hydrogenembrittlement theory.There are evidences that the fracture stress at the tip of the cracksis reduced by anodic dissolution due to its role in relieving strain hardening layer at cracktip.     

氯离子对316L不锈钢在连多硫酸中应力腐蚀的影响

用恒变形U形弯曲试样应力腐蚀试验研究了长期服役在650～720℃下的316L奥氏体不锈钢室温下在0．38mol／L连多硫酸溶液及0．38mol／L连多硫酸 0．5mg/L NaCl溶液中的应力腐蚀破裂(SCC)行为。采用金相显微镜(OM)、扫描电子显微镜(SEM)对裂纹形态、断口形貌进行观察和分析。结果表明，该钢在0．38mol／L连多硫酸溶液中没有发生应力腐蚀破裂现象，而在0．38mol／L连多硫酸 0．5mg／L NaCl溶液中发生了应力腐蚀破裂，裂纹扩展为混合型，氯离子对钢表面钝化膜的破坏是诱发应力腐蚀破裂的主要原因之一。     

ROLE OF HYDROGEN IN STRESS CORROSION CRACKING OF AUSTENITIC STAINLESS STEEL IN BOILING MgCl_2 SOLUTION

321不锈钢在pH=1的42％MgCl_2沸腾溶液中长时间浸泡后,有32ppm的氢能进入试样,并导致29％的塑性损失,但并不能产生滞后断裂。在1NH_2SO_4溶液和沸腾(146℃)LiCl溶液中动态充氢表明,如进入试样的氢量低于某个临界值,则不会产生氢致开裂.熔盐动态充氢表明,只要进入试样的氢量超过临界值并能连续供氢,则无论是321钢还是310钢,即使在160℃也能产生氢致开裂.在LiCl溶液中阳极极化,则促进应力腐蚀;阴极极化,当电流低于临界值时则能抑制应力腐蚀,如高于临界值则导致氢致开裂,321钢和310钢的动态充氢(室温或160℃)门槛值均高于应力腐蚀门槛值,断口形貌也不同。