Bulk phase transformation kinetics were not well understood before Davenport and Bain developed time鈥搕emperature-transformation (TTT) diagrams for steel alloys in the 1930s. These powerful diagrams revolutionized the heat treatment of steel and other alloys. Grain boundaries and internal interfaces are...
TTT diagrams of the 0.27C-1Cr and 0.27C-1Cr-RE steels are established by means of dilatometric measurement for kinetic curves at different temperatures and metallographic inspections, and the influence of RE on the TTT diagram is studied. The addi- tion
TTT diagram is an important reference in making heat treatment procedure for steels. A program is introduced in this paper with which the TTT diagram of M30Mn2 steel is fitted through cubic spline treatment of the test data, and a precise and smooth TTT curve is auto drafted by programming ...
钢的TTT曲线测定方法研究
The parameter I to the right of equations5-7 isthe volume fraction integral asshown on the right of equation 1. For bainite the integral is partially corrected to account for experimental observation[14]. Once the TTT diagram is calculated, it is possible to transform it into a CCT diagram...
shape of diagram looks like either S or like C. Fig. 4 shows the schematic TTT diagram for eutectoid plain carbon steel 8 Fig.4: Time temperature transformation (schematic) diagram for plain carbon eutectoid steel t 1 t 3 t 2 t 4 t 5 M F , Martensite finish temperature M 50, 50%...
I堕鐾 、:Investigationof TTTDiagramof S7Steel Abstract:TheTTTdiagramofS7steel wasinvestigatedbymeat3.sof full automatictransformaioatestinginstrumeat(Formasor—Digita1)andtheinflueace。f a Lloylagelement andausteaitiziagtemperatureDnTTTdiagramwasstudied.Theresultsc&nprovidethebasiaforsofteningaanea[...
1) TTT diagram TTT图1. The TTT diagram of H13 steel is investigated by full-automatic transformation test instrument (Formastor-Digital). 误码甲Formaster-Digital全自动相变仪测定了H13钢的退火用TTT图。2. The hardness method Was used to measure the TTT diagram of 6115 binitic steel. 用硬度...
itisconsideredthatseparationofupperandlowerbainitesinthebainiteCcurveisaccordancewiththedifferentmechanismsofupperandlowerbainites.Keywords:42CrMo4steel;TTTdiagram;thermal-mechanicaltestingmachine收稿日期:2008-05-07作者简介:张逸阳(1980— ), 男, 江苏扬州人, 讲师, 在读博士, 主要从事热处 理 智能 化 研究。
5) TTT diagram TTT曲线 1. Measurement of TTT diagrams of 42CrMo4 steel and analysis for separation of upper and lower bainites in the bainite C curve 42CrMo4钢TTT曲线测量及B_上与B_下的C曲线分离现象的分析 2. The TTT diagram and the CCT diagram on annealing of S7 steel were determined...