{"id":21916,"date":"2023-06-05T17:13:46","date_gmt":"2023-06-05T09:13:46","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=21916"},"modified":"2023-06-05T17:13:46","modified_gmt":"2023-06-05T09:13:46","slug":"carbide-insert-cryogenic-treatment","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/fr\/carbide-insert-cryogenic-treatment\/","title":{"rendered":"Comment ajoutons-nous la r\u00e9sistance des inserts en carbure YT 15 avec traitement cryog\u00e9nique"},"content":{"rendered":"
Le traitement cryog\u00e9nique a \u00e9t\u00e9 largement appliqu\u00e9 dans les pratiques de production en tant que processus visant \u00e0 am\u00e9liorer la dur\u00e9e de vie des plaquettes en carbure. Le carbure, un mat\u00e9riau d'outil couramment utilis\u00e9, a montr\u00e9 une am\u00e9lioration significative de la r\u00e9sistance \u00e0 l'usure apr\u00e8s avoir subi un traitement cryog\u00e9nique, comme les outils de tournage en carbure YT15. Cette \u00e9tude utilise des exp\u00e9riences orthogonales pour identifier les facteurs cl\u00e9s qui affectent le processus de traitement cryog\u00e9nique, fournissant ainsi une base scientifique pour la promotion du traitement cryog\u00e9nique. De plus, une analyse exp\u00e9rimentale et une exploration th\u00e9orique sont men\u00e9es pour \u00e9tudier les m\u00e9canismes sous-jacents qui contribuent \u00e0 l\u2019am\u00e9lioration de la r\u00e9sistance \u00e0 l\u2019usure obtenue gr\u00e2ce au traitement cryog\u00e9nique.<\/p>\n

\"carbide<\/p>\n

Orthogonal Experiment and Wear Resistance Test of cryogenic \u00a0Treatment<\/h1>\n

experiment<\/h2>\n

An orthogonal experiment was conducted using a batch of YT15 carbide\u00a0rhombic indexable turning carbide inserts produced by our company. The orthogonal experiment consisted of 4 factors with 3 levels each. Subsequently, a CJK6132 lathe was used to cut 45 steel under identical cutting conditions. The wear resistance performance of the carbide inserts, both with and without cryogenic treatment, was compared, and the key factors influencing the effectiveness of cryogenic treatment were identified.<\/p>\n

cutting parameters<\/h2>\n

The cutting depth (ap) is 0.3mm, the feed rate (f) is 0.25mm\/r, and the spindle speed (n) of the machine tool is 450 rpm.<\/p>\n

 <\/p>\n

Experimental results and mechanism of enhancing the wear resistance of carbides by cryogenic treatment<\/h1>\n

Key factors affecting the effectiveness of cryogenic treatment<\/h2>\n

In this experiment, the maximum wear value on the rake face (Va) is taken as the wear indicator, and its wear curve is shown in Figure 1. The values of maximum wear value (Va) and the specific data processing results are shown in Table 1. The curves \\9 in Figure 1 correspond to the rake faces treated with processes 1 to 9 in Table 1, while curve 10 corresponds to the untreated rake face. From the wear curve, it can be observed that the wear resistance of the carbide\u00a0tool significantly improves after cryogenic treatment compared to the untreated tool.<\/p>\n

From Table 1, it can be seen that the range of Va caused by different cryogenic temperatures is 0.103mm, the range of Va caused by different insulation times is 0.067mm, the range of Va caused by different cooling rates is 0.033mm, and the range of Va caused by different tempering temperatures is 0.031mm. Therefore, it can be concluded that the key factor influencing the effectiveness of cryogenic treatment is the cryogenic temperature, followed by the insulation time, cooling rate, and tempering temperature.<\/p>\n

\"\"<\/p>\n

YT 15\u00a0\u00a0Hardness analysis of blade<\/h2>\n

The wear resistance of carbide inserts is closely related to their hardness values. To investigate this, the Rockwell hardness (HRA) of the carbide inserts, both with and without cryogenic treatment, was measured, and the results are shown in Table 2.<\/p>\n

From Table 2, it can be observed that the hardness value of the carbide inserts after cryogenic treatment is moderately higher compared to the untreated carbide inserts. This indicates that there is a certain difference in the microstructure between the two types of carbide inserts.<\/p>\n

\"\"<\/p>\n

A vector along the lattice edge direction with a length equal to the lattice parameter is called a lattice basis vector, denoted as a, b, c respectively, and the length of the basis vector is known as the lattice constant. X-ray analysis results indicate that there is no significant difference in the lattice constants of WC in the carbide inserts after cryogenic treatment compared to the untreated ones. However, in the cryogenically treated YT15 carbide inserts, a larger amount of hexagonal close-packed Co (e Co) and a smaller amount of face-centered cubic Co (ar Co) were found. In contrast, the untreated YT15 carbide inserts exhibited a smaller amount of e Co and a larger amount of a+ Co. This indicates that cryogenic treatment leads to a certain amount of martensitic transformation of metallic Co in YT15, as revealed by X-ray analysis, with approximately 10% (by mass fraction) of \u03b1-Co converting into G Co.<\/p>\n

Hexagonal close-packed metals exhibit lower friction coefficients. A lower friction coefficient is beneficial in reducing frictional forces during the cutting process, thereby lowering the cutting temperature, minimizing tool wear during cutting, and improving the wear resistance of the tool. Additionally, hexagonal close-packed metals have lower adhesive wear characteristics compared to body-centered and face-centered metals. Therefore, the transformation of \u03b1-Co to G Co after cryogenic treatment will reduce adhesive wear during the cutting process.<\/p>\n

Therefore, the key reason why cryogenic treatment enhances the wear resistance of carbide inserts lies in its promotion of the martensitic transformation of \u03b1-Co to c Co.<\/p>\n

\"\"<\/p>\n

YT15 Microstructure Analysis of Blade<\/h2>\n

The main components of YT15 carbide inserts are WC, binder phase Co, and TC, with mass fractions of 79%, 6%, and 15% respectively. The primary performance of these carbide inserts depends on the characteristics of WC and the binder phase Co.<\/p>\n

The lattice constants of WC and TC in YT15 carbide inserts, after different treatment processes, were measured using an X-ray diffractometer (Model D8).<\/p>\n

 <\/p>\n

experiment result<\/h1>\n

(1) Cryogenic treatment significantly improves the wear resistance of YT15 carbide inserts. (2) The most crucial factor influencing the cryogenic treatment process is the cryogenic temperature, followed by the insulation time, cooling rate, and tempering temperature. (3) After cryogenic treatment, the Rockwell hardness of YT15 carbide inserts noticeably increases. X-ray diffraction analysis reveals that a certain amount of transformation occurs in the binder phase, from \u03b1-Co to \u03b5-Co, in YT15 after cryogenic treatment. This transformation is a polymorphic martensitic transformation and is the main reason for the improved wear resistance of YT15 carbide inserts.<\/p>\n

\"\"<\/p>\n

 <\/p><\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

Cryogenic treatment has been widely applied in production practice as a process to enhance the lifespan of carbide inserts. carbide, a commonly used tool material, has shown significant improvement in wear resistance after undergoing cryogenic treatment, such as YT15 carbide turning tools. This study utilizes orthogonal experiments to identify the key factors that affect the…<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[92],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/posts\/21916"}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/comments?post=21916"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/posts\/21916\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/media?parent=21916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/categories?post=21916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/fr\/wp-json\/wp\/v2\/tags?post=21916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}