Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 6    June 2010

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Effects of laser phase transformation hardening parameters on heat input and hardened-bead profile quality of unalloyed titanium
D. S. BADKAR1, K. S. PANDEY1, G. BUVANASHEKARAN2

1. Maulana Azad, National Institute of Technology, Bhopal- 462051, Madhya Pradesh, India;
2. Welding Research Institute, Bharat Heavy Electricals Limited, Tiruchirappalli-620014, Tamil Nadu, India

Abstract:Laser transformation hardening (LTH) of unalloyed titanium of 1.6 mm-thick sheet, nearer to ASTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG laser. The effects of laser power (750−1 250 W), scanning speed (1 000−   3 000 mm/min) and focal point position (from −10 to −30 mm) on the heat input, and hardened-bead geometry (i.e. hardened bead width (HBW), hardened depth (HD) and angle of entry of hardened bead profile with the surface (AEHB)) were investigated using response surface methodology (RSM). The experimental plan is based on Box-Behnken design matrix method. Linear and quadratic polynomial equations for predicting the heat input and the hardened bead geometry were developed. The results indicate that the proposed models predict the responses adequately within the limits of hardening parameters being used. It is suggested that regression equations can be used to find optimum hardening conditions for desired criteria.

 

Key words: laser transformation hardening; response surface methodology (RSM); unalloyed titanium; titanium; hardened-bead profile

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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