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对三种含砷量的30CrMnSiA钢进行了不同温度的回火处理,在室温下测取了回火处理试样的穆斯堡尔谱,同时对典型试样作了金相和俄歇电子能谱(AES)分析。试验结果表明。30CrMnSiA钢经淬火十回火处理后,其室温组织为α'固溶体、碳化物和少量残余奥氏体的混合组织。回火温度不同,碳化物的形态也不一样,残余奥氏体含量随回火温度升高而降低。低温回火脆性主要是残余奥氏体分解与ε+θ碳化物析出综合作用的结果。 相似文献
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热处理制度对30CrMnSiNi2A钢组织与性能的影响EI 总被引:1,自引:0,他引:1
研究了30CrMnSiNi2A钢900℃油淬后回火过程中微观组织与力学性能的关系。试验结果表明,该钢油淬后在250~270℃回火可以获得较好的强度与韧性配合。此工艺与等温淬火工艺相比,强度有所提高,断裂韧性提高幅度较大。 相似文献
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本文研究了710-840℃之间的30CrMnSiA钢的恒温超塑性。重点测试了在共析转变点Acl点附近的超塑性指标。研究结果表明,30CrMnSiA钢具有恒温相变超塑性特性,在Acl点温度附近材料延伸率有明显增长,流动应力最低。当初始应变速率为4.2×10^-4s^-1时,经预先调质处理的30CrMnSiA钢最大延伸率为608%,最低流动应力为55MPa,与710-740℃温度区间内的研究结果相比延 相似文献
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卯石刚 《理化检验(物理分册)》1995,31(2):46-46,55
以30CrMnMoTiA钢及30SiMnMoVA钢为研究对象,进行了晶界侵蚀剂的试验,提出了用相补金相观察法来提高晶粒对比度的观点和方法。 相似文献
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高温正火消除85Cr2Mn2Mo钢组织遗传的研究 总被引:2,自引:0,他引:2
在研究85Cr2Mn2Mo钢的组织遗传的基础上,着重研究了该钢组织遗传的消除,采用高温正火工艺,使85Cr2Mn2Mo钢经重结晶,奥氏体再结晶有效地细化了奥氏体晶粒,切断了组织遗传,并对85Cr2Mn2Mo钢的奥氏体再结晶温度做了有益的探析。 相似文献
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研究了不同As,Sb含量的30CrMnSiA钢的疲劳裂纹扩展速率,探讨了疲劳裂纹扩展速度随As、Sb含量的变化规律,结果表明:随As,Sb含量的增加,疲劳裂纹扩展速率略为增大,其临界转变温度升高,显微组织稍有粗化。 相似文献
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一种CrMnN不锈钢中碳化物等温沉淀动力学的研究 总被引:2,自引:0,他引:2
用膨胀仪、化学定量相分析(CPA)及TEM方法研究了ZG0Cr13Mn8N钢奥氏体中碳化物的等温沉淀动力学。结果表明,依据等温不同时间析出碳化物引起的Ms温度变化可更方便,更准确地测出奥氏体中碳化物等温沉淀动力学曲线;在900 ̄580℃范围内ZG0Cr13Mn8N钢中碳化物等温析出的鼻尖温度为800℃,相应的孕育期为2400S;碳化物主要以M23C6型沿晶界或夹杂物边界析出。 相似文献
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介绍了16Co14Ni10Cr2MoA超高强度钢氩弧焊接头的力学性能,与40CrMnSiMoVA超高强度钢的焊接接头作了对比分析,并借助金相和电镜对接头组织进行了分析。结果表明,该超高强钢的焊接性良好,不仅接头强度高,而且塑性和韧性仍保持很高水平。 相似文献
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用透射电镜观察了30CrMnSiNi2A钢等温的微观组织,疲劳裂纹扩展行为、裂纹尖端塑性区和位错结构,结果表明,等温状态组织由马氏体和贝氏体组成。在一个奥氏体晶粒内一般存在四个板条领域、裂纹尖端的塑性区内存在主位错带,疲劳断裂的基本组织单元为板条晶或板条束。裂纹遇到板条束界时方向发生较大偏斜。 相似文献
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《Drug development and industrial pharmacy》2013,39(4):415-421
A film formulation containing Kollicoat MAE 30 D, Kollidon 30, Sicovit Rot 30, titanium dioxide, talc, and a plasticizer for the aqueous manufacture of enteric coatings was studied for the coagulations occurring with certain plasticizers and for differences in resistance on highly swellable caffeine cores. Also included in these investigations were the latices Kollicoat MAE 30 DP and Eudragit L 30 D-55. The coagulations occurring with all three film latices can be attributed to the presence of Kollidon 30 together with certain excipients. Preparations with Kollidon 30, but without color pigments, showed no tendency to coagulate. The advantage of propylene glycol (PG) compared to other plasticizers such as triethyl citrate (TEC) is that no coagulations occurred, even in the presence of Kollidon 30 and color pigments. Among the Kollidon 30–free film formulations examined, a plasticizer content of 10–15% PG or TEC gave the best results. Optimal pigment distribution in the coat originally produced by Kollidon 30 can optionally be achieved by prolonged stirring of the pigment suspension. The resistance can be further improved by inclusion of a subcoating with Kollidon VA 64. Kollicoat MAE 30 D and MAE 30 DP and Eudragit L 30 D-55 showed identical behavior in this study. 相似文献
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A film formulation containing Kollicoat MAE 30 D, Kollidon 30, Sicovit Rot 30, titanium dioxide, talc, and a plasticizer for the aqueous manufacture of enteric coatings was studied for the coagulations occurring with certain plasticizers and for differences in resistance on highly swellable caffeine cores. Also included in these investigations were the latices Kollicoat MAE 30 DP and Eudragit L 30 D-55. The coagulations occurring with all three film latices can be attributed to the presence of Kollidon 30 together with certain excipients. Preparations with Kollidon 30, but without color pigments, showed no tendency to coagulate. The advantage of propylene glycol (PG) compared to other plasticizers such as triethyl citrate (TEC) is that no coagulations occurred, even in the presence of Kollidon 30 and color pigments. Among the Kollidon 30-free film formulations examined, a plasticizer content of 10-15% PG or TEC gave the best results. Optimal pigment distribution in the coat originally produced by Kollidon 30 can optionally be achieved by prolonged stirring of the pigment suspension. The resistance can be further improved by inclusion of a subcoating with Kollidon VA 64. Kollicoat MAE 30 D and MAE 30 DP and Eudragit L 30 D-55 showed identical behavior in this study. 相似文献
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通过多种表面测试手段对几种单一及双离子注入空间齿轮传动副用30CrMnSi材料的真空摩擦学性能进行了研究,同时对不同注入条件进行了计算机模拟计算。结果表明,Ti++N+双注入后表面真空摩擦磨损性能相对最好。这主要是由于离子注入引起的注入层微观结构变化改变了摩擦磨损机理,从而改善了材料的摩擦学性能。 相似文献
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