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20Cr圆钢是低成本的渗碳钢,应用范围广泛,但力学性能不稳定.通过热处理试验和分析,探索出最佳的20Cr圆钢试样热处理工艺,提高了性能的一次合格率. 相似文献
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20Cr圆钢是低成本的渗碳钢,应用范围广泛,但力学性能不稳定。通过热处理试验和分析,探索出最佳的20Cr圆钢试样热处理工艺,提高了性能的一次合格率。 相似文献
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为了得到综合性能优异的新型耐蚀耐磨钢,探究了淬火工艺对1.0Cr和3.5Cr两种钢组织性能的影响。借助场发射扫描电镜、透射电子显微镜、拉伸和冲击检测等手段对两种钢在不同淬火工艺下的组织性能进行了观察及分析。研究结果表明,淬火温度通过影响晶粒尺寸和碳化物溶解程度来影响两种钢的力学性能。当淬火温度为900℃时,两种钢均得到最佳的综合力学性能;当淬火温度低于900℃时,1.0Cr钢的晶粒尺寸不均匀导致力学性能相对较差,而3.5Cr钢中弥散分布的碳化物阻碍了原奥晶粒长大,因此其力学性能比同淬火温度下的1.0Cr钢更优异;淬火温度升高到960℃时,由于Cr的碳化物完全溶解,两种钢的晶粒尺寸均显著增大,力学性能相对降低。研究结果为获得最佳性能的新型耐蚀耐磨钢提供了工艺指导。 相似文献
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采用化学成分分析、金相检测及物理性能检测等方法,对40Cr钢托辊的开裂原因进行了分析。结果表明:位于托辊R角处的裂纹,属于淬火冷却裂纹;托辊R角处两侧壁厚相差较大,且未圆滑过渡,加之采用水作为淬火介质,使得淬火时组织转变产生的组织应力超过了材料的抗拉强度,产生了淬火裂纹。通过对托辊结构设计、淬火工艺等方面进行优化,可以降低40Cr钢托辊淬火开裂的风险。 相似文献
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A new Mn-series of oil-quenched super-strength bainitic steel was developed on the basis of the alloy system of the original Mn-series air cooled bainitic steel. The mechanical properties of the new steel are well combined while precious alloy elements and complicated technologies are not needed for its production. Experimental results show that bainite/martensite (B/M) dual phase microstructure can be obtained within a very wide cooling rate range and bainite microstructure exists even when the cooling rate reaches as fast as 60 ℃/s; the hardenability of the steel is better than that of 40CrNiMo and 42CrMo; the diameter of the round bar made of the steel is 250 mm, and the round bar tempered at 350 ℃ after oil quenching exhibits its central mechanical properties as follows: Rm=1550 MPa, Rp0.2=1270 MPa, A=15%, aku=95 J/cm2 (at room temperature). 相似文献
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采用不同的热处理工艺分析淬火和回火温度及保温时间对1Cr13不锈钢力学性能、金相组织的影响,得到使其力学性能达到最好的热处理工艺,使1Cr13的力学性能符合GB1220-99的要求。 相似文献
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试验1Cr12Ni3Mo2VN钢(/%:0.13C,0.16Si,0.70Mn,11.42Cr,2.78Ni,1.67Mo,0.30V,0.0360N)的冶金流程为30t EAF-LF-VD-3t ESR-锻造成Φ350mm材。研究了950~1100℃淬火和200~700℃回火对1Cr12Ni3Mo2VN钢组织与性能的影响以及500℃,500~10000h时效的拉伸性能。结果表明,淬火温度950~1100℃对1Cr12Ni3Mo2VN钢力学性能的影响不明显;该钢的回火脆性区在600℃左右,但对钢的塑性的影响较小。经1040℃淬火、540℃回火的1Cr12Ni3Mo2VN钢,在500℃时效500h后,其抗拉强度和屈服强度分别下降了7.7%和5.8%,时效10000h后,其抗拉强度和屈服强度分别下降了13.4%和14.6%,断面收缩率下降了40%,主要原因是杂质元素在晶界处偏聚以及碳化物在晶界处析出。 相似文献
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高强度弹簧钢60SiCrV7 的性能和应用 总被引:5,自引:0,他引:5
试验研究了新型高强度弹簧钢60SiCrV7(%:0.54~0.65C,1.35~1.65Si,0.7~1.0Cr,0.1~0.2V)的淬、回火工艺对力学性能的影响,结果表明,经最佳热处理工艺920℃油淬,430~450℃回火后,钢的抗拉强度为1750MPa,屈服强度1440MPa,冲击功9J,具有高的疲劳寿命,可以满足高强度弹簧设计需求。 相似文献
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研究了淬火温度对780 MPa级水电用钢(/%:0.09C,0.10Si,1.50Mn,0.009P,0.002S,0.90Cr,0.20Ni,0.023Ti,0.004Nb,0.001 0B)组织和力学性能的影响。结果表明,试验钢不同温度淬火后均得到了板条贝氏体组织,随着淬火温度910℃升高至950℃,奥氏体平均晶粒从9.1μm长大到16.6μm,试验钢回火后基本保持了淬火态的板条结构。淬火温度在910~950℃试验钢的强度随着淬火温度的升高先增大后减小,并在930℃时达到最大,试验钢冲击韧性和断后延伸率与强度有着相同的变化规律。在930℃淬火,610℃回火的工艺参数条件下,获得最佳的力学性能:屈服强度为802 MPa,抗拉强度为858 MPa,伸长率为19%,-40℃冲击功为238 J。 相似文献
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The mechanical properties of the steel are different under different heat treatment processes, due to the different contents and morphologies of martensite and bainite in the steel. Different heat treatment processes of 45 steel, 40Cr steel and 38CrSi steel were used to obtain the martensite and bainite structure. The micromorphologies of martensite and bainite in different steels were observed and analyzed by optical microscopy, scanning electron microscopy and transmission electron microscopy, and their contents were estimated. The results show that the morphology of martensite in steels with different carbon contents after water quenching changes with the increase in carbon content, and the transition is from low- carbon lath to medium- carbon needle- strip coexistence. After different heat treatments of the same kind of steel, bainite with different morphologies can be obtained. Most bainite of 45 steel, 40Cr steel and 38CrSi steel nucleates at grain boundaries and grows inside the grain. The precipitation of carbonless bainite and granular bainite is related to the heat treatment process. The bainite morphology gradually changes from feather bainite to carbon- free bainite as the carbon content and heat treatment temperature decrease. 相似文献