钢 的奥氏体实际晶粒度对钢材的性能影响很大,在一般加热速度下,加热温度愈高、加热时间效长,则奥氏体晶粒愈粗大。粗大奥氏体晶粒冷却后获得粗大的转变产 物,其强度,韧性、疲劳抗力等力学性能较差,且奥氏体晶粒粗大的钢材在淬火时易变形、开裂,因些检测奥氏休晶粒大小有重要的意义。
对于使用广泛的20MnSi螺纹钢,未见有较好的奥氏体晶界侵蚀剂介绍。作者试用过盐酸苦味酸酒精溶液、氯化铜苦味酸水溶液等侵蚀剂,效果均不理想。考虑 到苦味酸[C5H2(NO2)30H]是弱酸,电离度比硝酸小.而且硝基(NO2)没有硝酸根(NO3)氧化性强,所以没有硝酸腐蚀能力强。用苦味酸酒精 溶液侵蚀,试样中珠光体、贝氏体、回火马氏体同样可清晰显示,故显示奥氏体晶界的试剂中含苦味酸的试剂用得最为广泛。苦味酸水溶液比苦味酸酒精溶液侵蚀速 度快,这是由于侵蚀剂在水中分解强烈所致。但苦味酸水溶液腐蚀试样时易产生一层难溶的腐蚀产物,形成粘附膜,引起钝化,因此往往效果不佳,晶界不清晰。烷 基苯磺酸钠是表面活性剂,属阴离子系表面活性剂,在溶液中离解成R-SO3-+Na-,K-SO3-,憎水团定向吸附于试样侵蚀产物的微粒表面.构成单分 子或多分子定向排列,使氧化膜容易脱落,侵蚀得以继续。反复试验证实:用饱和苦味酸加十二烷基苯磺酸钠水溶液进行热侵蚀能较好地显示20MnSi钢的奥氏 体晶界。最佳配方为:苦味酸5g,十二烷基苯磺酸钠4g,加水至100ml。将此溶掖加热至沸腾lmin,停止加热,在约80℃时将试样侵入进行热侵蚀约 50s.待试样出现一层黑膜后,用清水冲洗,酒精清洗、吹干即可。侵蚀效果见图1,图2.可见开裂20MnSi螺纹钢样品奥氏体晶界显著宽化。
Bewise Inc. www.tool-tool.com Reference source from the internet.
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BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 http://www.tool-tool.com / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan
Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users’ demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting tool、aerospace tool .HSS DIN Cutting tool、Carbide end mills、Carbide cutting tool、NAS Cutting tool、NAS986 NAS965 NAS897 NAS937orNAS907 Cutting Tools,Carbide end mill、disc milling cutter,Aerospace cutting tool、hss drill’Фрезеры’Carbide drill、High speed steel、Compound Sharpener’Milling cutter、INDUCTORS FOR PCD’CVDD(Chemical Vapor Deposition Diamond )’PCBN (Polycrystalline Cubic Boron Nitride) ’Core drill、Tapered end mills、CVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden Finger’PCD V-Cutter’PCD Wood tools’PCD Cutting tools’PCD Circular Saw Blade’PVDD End Mills’diamond tool. INDUCTORS FOR PCD . POWDER FORMING MACHINE ‘Single Crystal Diamond ‘Metric end mills、Miniature end mills、Специальные режущие инструменты ‘Пустотелое сверло ‘Pilot reamer、Fraises’Fresas con mango’ PCD (Polycrystalline diamond) ‘Frese’POWDER FORMING MACHINE’Electronics cutter、Step drill、Metal cutting saw、Double margin drill、Gun barrel、Angle milling cutter、Carbide burrs、Carbide tipped cutter、Chamfering tool、IC card engraving cutter、Side cutter、Staple Cutter’PCD diamond cutter specialized in grooving floors’V-Cut PCD Circular Diamond Tipped Saw Blade with Indexable Insert’ PCD Diamond Tool’ Saw Blade with Indexable Insert’NAS tool、DIN or JIS tool、Special tool、Metal slitting saws、Shell end mills、Side and face milling cutters、Side chip clearance saws、Long end mills’end mill grinder’drill grinder’sharpener、Stub roughing end mills、Dovetail milling cutters、Carbide slot drills、Carbide torus cutters、Angel carbide end mills、Carbide torus cutters、Carbide ball-nosed slot drills、Mould cutter、Tool manufacturer.
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BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт www.tool-tool.com для получения большей информации.
BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web www.tool-tool.com for more info.
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