{"id":1687,"date":"2026-06-17T00:00:00","date_gmt":"2026-06-17T00:00:00","guid":{"rendered":"https:\/\/dtmaterials.com\/nobis-expedita-sunt-sint-nobis-eum\/"},"modified":"2026-07-08T14:55:22","modified_gmt":"2026-07-08T14:55:22","slug":"nobis-expedita-sunt-sint-nobis-eum","status":"publish","type":"post","link":"https:\/\/dtmaterials.com\/zh\/nobis-expedita-sunt-sint-nobis-eum\/","title":{"rendered":"\u5f71\u54cdTC4\u949b\u5408\u91d1\u5207\u524a\u6027\u80fd\u7684\u5173\u952e\u56e0\u7d20\u2014\u2014\u786c\u8d28\u5408\u91d1\u6d82\u5c42"},"content":{"rendered":"\n
\"Cross-sectional
Titanium Alloy Cutting Tools<\/figcaption><\/figure>\n\n\n

Key Factors Influencing the Cutting Performance of TC4 Titanium Alloy: Cemented Carbide Coatings To address the issues of difficult machining of TC4 titanium alloy and the premature failure of conventional TiAlN-coated cutting tools, a WC-6Co ultrafine cemented carbide substrate was prepared via powder metallurgy, and TiAlN coating and NbN\/TiAlN composite coating were deposited on the substrate respectively by physical vapor deposition (PVD).<\/p>\n

The microstructure and cutting performance of the uncoated substrate and the two coated cutting tools were systematically compared.<\/p>\n

Scanning electron microscopy (SEM) results revealed that both coatings exhibit dense columnar crystal structures.<\/p>\n

Cutting experiments on TC4 titanium alloy were conducted under the cutting conditions of cutting speed vc = 80 m\u22c5min\u207b\u00b9, feed rate f = 0. 08 mm\u22c5r\u207b\u00b9 and cutting depth ap = 0. 5 mm.<\/p>\n

The experimental results show that the TiAlN-coated insert failed drastically after 18 minutes of cutting due to the affinity interaction between Ti elements, while the uncoated insert failed after 24 minutes.<\/p>\n

In contrast, the NbN surface layer of the NbN\/TiAlN-coated insert effectively blocks elemental diffusion, enabling the insert to remain in service for 30 minutes with stable wear progression.<\/p>\n

The findings demonstrate that the NbN\/TiAlN composite coating can significantly improve the wear resistance and service life of cemented carbide cutting tools, which provides a novel approach for the design of high-efficiency cutting tools for titanium alloy machining.<\/p>\n

Conclusion
By analyzing the substrate morphology, coating cross-sections, and 3D profiles of uncoated inserts, TiAlN-coated inserts, and NbN\/TiAlN-coated inserts, the grain growth behavior of different insert materials was investigated.<\/p>\n

Cutting experiments were conducted under conditions of a cutting speed of 80 m\u00b7min\u207b\u00b9, a feed rate of 0.08 mm\u00b7rev\u207b\u00b9, and a cutting depth of 0.5 mm. The following conclusions were obtained:<\/p>\n

(1) Observations of the microstructure of TiAlN and NbN\/TiAlN coatings revealed that both TiAlN and NbN exhibit columnar grain growth, with TiAlN depositing faster than NbN. Additionally, the surface roughness of the TiAlN layer is lower than that of the NbN layer.<\/p>\n

(2) Comparing the three types of inserts in cutting tests showed that the uncoated ultra-fine carbide insert actually had a longer tool life than the TiAlN-coated insert, while the NbN\/TiAlN-coated insert exhibited the best tool life.<\/p>\n

(3) Examination of wear patterns on the three inserts revealed that the primary wear modes for insert 1 were groove wear and adhesion wear; insert 2 experienced the most severe adhesion wear, resulting in the poorest wear resistance, with adhesion wear being the dominant mode; for insert 3, the outer NbN layer effectively prevented interaction between the underlying TiAlN layer and the titanium alloy workpiece, leading to superior wear resistance, with groove wear and adhesion wear being the main wear mechanisms.<\/p>\n

Due to the strong chemical affinity of titanium alloys, coatings face more stringent requirements.<\/p>\n

Currently, although TiAlN-coated tools are widely used in machining titanium alloys, the strong affinity between titanium elements often leads to severe adhesion and diffusion wear, causing chip sticking and consequently reducing tool life.
Due to their excellent mechanical properties, titanium alloys have become key materials in aerospace, automotive, and energy industries [1]. However, they are difficult-to-machine materials with poor machinability. Machinability refers to the ease or difficulty of machining a workpiece, and the poor machinability of TC4 is mainly reflected in the following aspects [2\u20134]: a small deformation coefficient (less than or close to 1), which increases the sliding friction distance of chips along the rake face, thereby intensifying tool wear and shortening tool life; high cutting temperatures, with a machining coefficient approximately 1\/7 to 1\/5 that of 45 steel, combined with extremely short chip-tool contact length, leading to concentrated and poorly dissipated cutting heat, thus imposing high demands on the high-temperature resistance of tool coatings; severe cold hardening occurs due to the material’s high chemical reactivity, which easily reacts with oxygen and nitrogen in the atmosphere to form hard and brittle layers\u2014this not only hardens the workpiece surface but also reduces its fatigue strength while accelerating tool wear; and prominent wear issues arise, as adhesive wear is prone to occur under high-temperature and high-pressure cutting conditions, especially when paired with conventional TiAlN coatings, where significant diffusion of titanium elements between the workpiece and coating further accelerates coating failure.
Studies indicate that modifying tool surfaces through coating technologies such as physical vapor deposition (PVD) can significantly enhance their resistance to high-temperature oxidation and adhesive wear, thereby extending tool life to 2\u20133 times that of conventional tools and improving cutting performance.<\/p>\n

Research has also shown that the optimal cutting parameters for thin-walled TC4 titanium alloy components are a cutting speed vc = 65 m\/min, feed rate f = 0.05 mm\/rev, and depth of cut ap = 0.25 mm.<\/p>\n

Investigations into various combinations of cutting parameters for high-speed machining of TC4 titanium alloy revealed that when the cutting speed vc ranges from 72.2 to 101 m\/min, with a depth of cut ap = 0.5 mm and feed rate f = 0.11 mm\/rev, the machinability of TC4 titanium alloy is relatively ideal, and the surface quality achieved is superior to that obtained at lower cutting speeds.<\/p>","protected":false},"excerpt":{"rendered":"

Key Factors Influencing the Cutting Performance of TC4 Titanium Alloy: Cemented Carbide Coatings To address the issues of difficult machining of TC4 titanium alloy and the premature failure of conventional TiAlN-coated cutting tools, a WC-6Co ultrafine cemented carbide substrate was prepared via powder metallurgy, and TiAlN coating and NbN\/TiAlN composite coating were deposited on the […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[40],"tags":[],"class_list":["post-1687","post","type-post","status-publish","format-standard","hentry","category-ti-solutions"],"_links":{"self":[{"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/posts\/1687","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/comments?post=1687"}],"version-history":[{"count":4,"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/posts\/1687\/revisions"}],"predecessor-version":[{"id":2065,"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/posts\/1687\/revisions\/2065"}],"wp:attachment":[{"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/media?parent=1687"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/categories?post=1687"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dtmaterials.com\/zh\/wp-json\/wp\/v2\/tags?post=1687"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}